4- 1 materials, construction tools and construction environment
1. material
(1) cement. Ordinary Portland cement, slag Portland cement, pozzolanic Portland cement. The strength grade of cement shall not be lower than 32.5MPa, and it shall not be wet or caked, and the delivery time shall not exceed 3 months. In case of special circumstances, it can only be used after passing the test. Different types of cement should not be mixed.
(2) sand. Choose hard, rough and clean coarse sand with an average particle size of not less than 0.5mm and a maximum particle size of not more than 3mm ... The sand shall not contain organic impurities such as garbage and grass roots, the mud content shall not be greater than 1%, and the sulfide and sulfate content shall not be greater than 1%.
(3) water. Drinking water is generally used. If natural water is used, it should meet the requirements of concrete water use.
2. Building tools
Commonly used tools are:
Cleaning tools (used to clean the base) hammer, drill bit, axe, wire brush, broom, brown brush, rubber hose, bucket, etc.
Mortar plastering tools mortar mixer or mixing plate, shovel, bucket, ash bucket, sieve, brown brush, spatula, etc.
3. Built environment
The construction working environment shall meet the following requirements:
(1) The temperature is above 5℃ and below 40℃, and the wind force is below 4. Sun protection and rain protection should also be done in open-air construction in summer, and heating and insulation measures should be taken in construction below 5℃ in winter.
(2) When the project is constructed below the groundwater level, the water level should be lowered below the plastering layer before the construction. Surface water should be removed.
(3) For the maintenance of the waterproof layer of the old project, the leakage should be blocked or blocked, and the plastering should be cross-constructed to ensure the smooth construction of the waterproof layer.
4-2 Primary treatment
Grass-roots treatment is very important, which is the key to ensure that the waterproof layer is firmly combined with the base surface and is not empty and dense. Grass-roots treatment includes cleaning, watering, brushing and leveling to keep the grass-roots surface moist, clean, flat, solid and rough.
1. Treatment of concrete base
(1) In the new concrete project, after the formwork is removed, the concrete surface is immediately brushed with a steel wire brush, then rinsed with water, and then plastered.
(2) When repairing the waterproof layer of the old concrete project, the surface must be chiseled with a drill, axe and wire brush, cleaned and rinsed, and then brushed with a brown brush.
(3) The uneven surface of concrete base and honeycomb holes should be treated according to different situations.
More than 1cm, uneven edges and corners should be chiseled into a gentle slope shape, cleaned with water, and leveled by layers with plain ash and cement mortar (Figure 17-25).
Figure 5 Treatment of Uneven Concrete Base
Loose stones should be removed from the honeycomb holes on the concrete surface, washed with water, and leveled with plain ash and cement mortar alternately until they are flush with the base surface (Figure 17-26).
Fig. 6 Treatment of honeycomb holes in concrete base
The honeycomb bed on the concrete surface is not deep, and the stones are firmly bonded. After washing with water, it is made of plain ash and compacted and leveled with cement mortar (Figure 7).
Fig. 7 Treatment of honeycomb pits on concrete base
(4) Construction joints of concrete structures should be chiseled into splayed grooves along the joints, washed with water, brushed with plain ash, and compacted and leveled with cement mortar, as shown in Figure 7.
2. Treatment of brick masonry foundation
For newly laid masonry, the mortar and other dirt remaining on its surface should be removed and watered. For the old masonry, the loose skin and mortar on its surface should be cleaned until the hard brick surface is exposed and watered.
Brick masonry built with lime mortar or mixed mortar shall be jointed to the depth of 1cm and at right angles (Figure 17-28).
Fig. 8 jointing of brick masonry
3. Rubble and masonry foundation treatment
The treatment of this masonry foundation is basically the same as that of concrete and brick masonry foundation. When building with lime mortar or mixed mortar, the mortar joint should be carved 1cm deep and the joint should be at right angles. For stone masonry with uneven surface, after cleaning, a leveling layer should be made on the base surface. The method of leveling layer is as follows: firstly, brush a layer of cement slurry with water cement ratio of about 0.5 on the surface of stone masonry with a thickness of about 1mm, and then apply 1~ 1.5cm cement mortar, and the surface will be swept into rough surface. If you can't find peace once, wipe it every two days.
Grass-roots treatment must be watered and wet, which is an important condition to ensure that the waterproof layer is firmly combined with the grass-roots without hollowing out. Watering should be repeated in order. Brick masonry should be poured until the surface of masonry is basically saturated, and it is qualified if it does not absorb water after plastering mortar.
17-2-4-3 Mixing of Mortar
Mortar can be mixed mechanically or manually. When mixing, materials should be added in strict accordance with the mixture ratio and mixed evenly.
Mixed mortar should not be stored for too long to prevent segregation and initial setting, and the mortar after initial setting shall not be reused with water.
17-2-4-4 Key points of mortar plastering construction
1. Operation of waterproof layer of concrete roof and wall
2 mm thick ordinary gray layer. First, apply a layer of plain ash with a thickness of 1mm, and scrape it back and forth with an iron trowel to make the plain ash fill the pores on the surface of the base. Immediately put a layer of plain ash leveling layer with a thickness of 1mm on the surface of the base layer that has been scraped with plain ash, and then brush it on the surface of the plain ash layer in turn with a wet brush.
The thickness of the first layer of cement mortar is 6 ~ 8mm. When the plain ash layer is initially set, the cement mortar layer should be plastered to prevent the plain ash layer from being too soft or too hard and damaging the plain ash layer; If it is too hard, the bond will be poor, and the cement mortar should be pressed into a thin layer with a thickness of about 1/4 (Figure 9). After plastering, when the cement mortar is initially set, use a broom to sweep out horizontal stripes in one direction.
Fig. 9 Schematic diagram of connection between mortar layer and plain ash layer
1- The plain ash layer is too soft; Sand grains penetrate the plain ash layer; 2- The plain ash layer is too hard, and the cement mortar layer is poorly connected with the plain ash layer;
3- The plain ash layer is suitable for soft and hard, and there is a connection layer of 0.5mm between the plain ash layer and the cement mortar layer.
The thickness of the second layer of cement mortar is 6 ~ 8mm. Apply cement mortar on the first layer according to the operation method of the first layer. After plastering, before the cement mortar is solidified, it should be compacted with an iron trowel in the process of water evaporation. Generally, it is advisable to plaster for 2~3 times, and then calender.
2. Brick wall and vault waterproof layer operation
Brush the first layer with cement slurry, the thickness is about 1mm, and brush it evenly back and forth. After brushing, the second, third and fourth layers can be applied, and its operation method is the same as that of concrete base waterproofing.
3. Operation of stone wall and vault waterproof layer
After the cement mortar of leveling layer (one layer of plain ash and one layer of mortar) is fully hardened, the waterproof layer can be constructed by properly watering and wetting its surface, and its operation method is the same as that of concrete base waterproof.
4. The ground waterproof layer operation
The operation of ground waterproof layer is different from that of wall and roof waterproof layer. Without scraping the plain ash layer (the first and third layers) on the ground, evenly brush the mixed cement mortar layer back and forth with a brown brush. The second and fourth layers are evenly spread on the plain lime layer according to the thickness requirements before and after the initial setting of the plain lime layer, and plastering is carried out according to the operating requirements of the wall and roof. The thickness of each floor is also the same as that of the wall and roof. The waterproof layer on the ground shall be constructed from the inside to the outside to prevent being trampled (Figure 10).
Figure 10 Ground Construction Sequence
5. The structure of special parts
(1) The waterproof layer at the yin and yang corners of the structure should be rounded, with the diameter of the yin angle of 5cm and the diameter of the yang angle of 1cm.
(2) The construction joints of the waterproof layer should have a stepped slope, and the lap joints should be overlapped step by step in the order of layered operation. Leave if the location of the general stay on the ground, also can stay on the wall, leave if the child must be more than 20cm away from the Angle of Yin and Yang (figure 1 1).
Figure 1 1 waterproof layer rubbing treatment
Construction of waterproof mortar mixed with inorganic small molecule waterproof agent
Brief introduction of 5- 1 waterproof agent
1. chloride metal salt waterproof agent (also known as waterproof slurry)
Chloride metal salt waterproofing agent is a liquid made of calcium chloride, aluminum chloride and water, which is light yellow. After being mixed with cement mortar, water-containing compounds such as calcium chlorosilicate and calcium chloroaluminate are generated through chemical reaction, which fills the gaps of cement mortar, cuts off capillary channels and improves the impermeability of cement mortar. There are finished products on the market.
If the chloride metal salt waterproofing agent is self-made, please refer to table 12 for preparation.
Mix proportion table of chloride metal salt waterproofing agent 12
Material Name Weight Mix Proportion (%) Remarks
Solid aluminum chloride 4 for industrial use
Industrial products with calcium chloride content not less than 70%.
Water 50 tap water or drinking water
Preparation method:
(1) Weigh the materials according to the proportion;
(2) Crushing solid calcium chloride into fragments with a particle size of about 3 cm;
(3) adding solid calcium chloride fragments into water, and continuously stirring with a wooden stick until the calcium chloride is completely dissolved (continuously heating the liquid in the process);
(4) When the temperature of the liquid drops to 50-52℃, aluminum chloride is added and stirred until it is completely dissolved, thus obtaining the waterproof agent.
2. Inorganic aluminum salt waterproofing agent
Inorganic aluminum salt waterproofing agent is a yellowish or brownish oily liquid made of inorganic aluminum and calcium carbonate as main raw materials and a variety of inorganic chemical raw materials. When mixed with cement mortar, it can react chemically with cement hydration products such as tricalcium silicate, tricalcium aluminate hydrate, tricalcium ferrite, etc., to form water-insoluble colloid and some swelling double salts, such as calcium chlorate hydrate, calcium chlorate hydrate, calcium chlorosilicate hydrate, etc., which can fill capillary channels and cracks formed during cement hydration, thus increasing the compactness of cement mortar and effectively improving it.
There are many inorganic aluminum salt waterproofing agents in the market, which can be selected according to their technical performance and engineering characteristics.
5-2 Mix proportion of waterproof paste and mortar
1. See table 13 for the mixture ratio of pure slurry and mortar mixed with chloride waterproofing agent.
Mix proportion (weight ratio) of calcium chloride waterproofing agent 13
Material name: cement sand water repellent
Waterproof sticker 8-6 1
Waterproof mortar 8 36 1
2. Clean mortar mixed with inorganic aluminum salt waterproofing agent. See table 14 for mortar mixture ratio.
Mix proportion table of inorganic aluminum salt waterproofing agent 14
Material name cement sand water inorganic aluminum salt waterproofing agent remarks
Waterproof paste 1 2 ~ 2.5 0.03 ~ 0.05 weight ratio
Waterproof mortar (bottom layer)12.5 ~ 3.5 0.4 ~ 0.5 0.05 ~ 0.08 weight ratio
Waterproof mortar (surface course)12.5 ~ 3.00.4 ~ 0.50.05 ~ 0.10 by weight.
5-3 architecture
1. Basic treatment shall be carried out according to the requirements of 4-2.
2. The construction operation should be carried out according to the requirements of 4-4.
3. Maintenance: 14d needs watering maintenance.
6 mortar construction mixed with silicone waterproofing agent
Brief introduction of 6- 1 waterproof agent
Silicone cement mortar is made of cement, sand and silicone waterproofing agent in a certain proportion.
1. Waterproof mechanism
The main components of silicone waterproofing agent are sodium methyl silanol (potassium) and high boiling sodium silanol (potassium). It is a small molecule water-soluble polymer, which is easily decomposed by weak acids. Carbon dioxide contained in the air generates methyl silanol under the action of water, as shown in the formula (14):
( 14)
In the formula (I), silanol group is very active. On the one hand, it is further reacted and condensed into a reticular silicone resin film (hydrophobic); On the other hand, it reacts with silanol groups contained on the surface of silicate building materials to dehydrate and crosslink, so that the surface of silicate building materials is bonded with hydrocarbon groups, so that its structure is completely the same as that of silicone resin, the surface tension is reduced, and the contact angle of water is increased to about 65438+005, forming a hydrophobic layer. Therefore, it is not difficult to see that the products of this chemical reaction not only fill the capillary channels inside the cement mortar, but also show the "reverse capillary effect", thus effectively increasing the compactness of the cement mortar.
2. Technical performance of silicone waterproofing agent.
See table 15 for the technical performance of silicone waterproofing agent.
Table 15 Main Technical Indicators of Waterproofing Agent in silicone
Project number: sodium methyl silanol, high boiling point sodium silanol.
1 light yellow liquid to colorless transparent liquid
The solid content (%) of 2 is about 34,31~ 35.
3pH 13 14
4 Relative density (25℃)1.251.25 ~1.26
5 Silicon content (%) 3 ~ 5 1 ~ 3
6 Sodium chloride content (%) ≤ 2 2
7 viscosity (25℃) 10 ~ 25
8 Total alkali content (%) ≤ 8 < 20
17-2-6-2 mixture ratio of waterproof paste and mortar
The ratio of 1. silicon water is shown in table 15 and table 16.
Alkaline silica-water mixing ratio table 16
Use weight-volume ratio
Silicone waterproof agent water.
17 ~ 919 ~11Prepare waterproof mortar and apply waterproof layer.
Table 17-29 Proportion of Neutral Silicon Water
Weight ratio use
Silicone waterproof agent aluminum sulfate or aluminum nitrate.
1.5 ~ 6 0.4 ~ 0.5 Prepare waterproof mortar and apply waterproof layer.
2. See table 17 for the mixture ratio of clean paste and mortar.
Table 18
Mix proportion of silica-water mortar
Silicone waterproofing agent: water cement: sand: silicon water.
Bond layer cement slurry 1: 7 1: 0: 0.6
Bottom waterproof mortar 1: 8 1: 2: 0.5
Surface waterproof mortar 1: 9 1: 2.5: 0.5
6-3 architecture
1. Basic treatment shall be carried out according to the requirements of 4-2.
2. Building technology
(1) Spray silicon water on the treated base surface. Spray alkaline silicon water 1~2 times, and proceed to the next process in wet state.
(2) Wipe the adhesive layer. After spraying silicon water, apply 2~3mm thick cement slurry on the base, and apply pressure while applying it, so that it can be closely combined with the base. When the plain cement slurry layer reaches the initial setting, the mortar layer should be laid.
(3) Apply waterproof mortar. The mortar layer shall be constructed twice according to the bottom layer and the surface layer. Before construction, the angle of yin and yang should be well done, and then the underlying mortar with a thickness of about 0.5~0.6cm should be spread and compacted. After the initial setting of the bottom mortar, rub it into a pitted surface with a wooden trowel, and then carry out surface construction. The thickness of the surface layer is about 1.5cm, and the construction method is the same as that of the bottom layer, except that it should be compacted and polished during initial setting.
(4) maintenance. After the waterproof layer is completed, wet curing shall be carried out in time, and attention shall be paid to the wet curing in section 14d to avoid premature shrinkage cracks.
(5) Precautions:
1) The materials used shall be rechecked after entering the site, and can only be used after the performance indicators are qualified.
2) When the base is too wet or the outdoor operation meets the rain, no construction is allowed. Wet the base after spraying silicon water, and check the waterproof effect by checking whether the dripping water is absorbed. If it is absorbed, it will have no waterproof effect, and silicon water can be sprayed again. Generally speaking, silicone oil water will not be washed away by water after spraying for 24 hours.
3) When the waterproof layer is constructed, the trapezoidal slope shall be reserved.
4) When preparing mortar, the water-cement ratio should be strictly controlled to ensure the quality of mortar and the workability of construction.
5) Silicone waterproofing agent has good high and low temperature resistance and can be used in winter construction. If the waterproof agent is frozen, it can still be used after melting without affecting its effect.
6) When the cement mortar is mixed with neutral silicon water, the neutral silicon water shall not be mixed with 108 glue first, but the diluted 108 glue shall be mixed into the cement mortar first, and then the neutral silicon water shall be added to continue stirring to prepare neutral waterproof mortar.
7) Silicone waterproofing agent should be stored in a closed plastic container. If exposed for a long time, it will form a precipitate and fail.
8) Silicone waterproof agent is strongly alkaline, so it is not suitable to touch the skin when used, and special attention should be paid to protecting eyes.
7 mortar construction mixed with plasticizing expansion agent
Brief introduction of 7- 1 mortar mixed with plasticizing expansion agent
See table 19 for the performance of plasticizing expansion agent.
Plasticizing Expansive Agent 19 Performance Table
Chemical composition variety of expansion source Solid volume expansion rate
23-25% of calcium sulphoaluminate type silica
a 12O 3 8 ~ 10%
fe2o 3 1 ~ 1.5%
Cao 27~30%
Magnesium oxide 1~ 1.5%
SO3 20 ~ 25%
Na2O 0.5 ~ 1.0%
Water reducer hydrated calcium sulphoaluminate
(ettringite) 1.22 ~ 1.75 times
The performance of waterproof mortar mixed with plasticizing expansion agent is shown in Table 20.
Performance Table 20 of Pushing Plastic Expansion Waterproof Mortar
Unit quality index of test items
Quality requirements meet the target.
Compressive strength mpa3d > 20 25
7d > 45 50
28d > 45 50
Expansion rate% 3d > 0.004 0.005
7d > 0.007 0.008
28d 300 > 400
Water absorption (48h)% > 65 50
17-2-7-2 Proportion of net paste and mortar
See table 2 1 for the mixture ratio of cement slurry and mortar.
Mix proportion of cement slurry and mortar (weight ratio) Table 2 1
Category mix ratio impermeability grade
Cement plasticizing expansion agent mixed with sand water
Clean pulp1.5/1
Mortar18% ~10% 2.50.45 > P8
7-3 architecture
1. Basic treatment shall be carried out according to the requirements of 4-2.
2. The construction operation should be carried out according to the requirements of 4-4.
3. Maintenance:
(1) This mortar must be cured with enough water in the early stage.
(2) The water curing time shall not be less than 14d.
17-2-8 construction of polymer cement waterproof mortar
Microstructure and mechanical properties of 8- 1 polymer cement hardened body
Polymer cement mortar makes up for the defects of ordinary cement mortar, such as excessive rigidity and insufficient toughness, improves the adaptability of rigid plastering technology to waterproof engineering, and expands the application scope of rigid plastering technology.
The cementing material in polymer cement mortar is different from the above-mentioned small molecular waterproofing agent, and the polymer and cement in polymer cement simultaneously assume the function of cementing material. It is an organic composite of organic polymer materials and inorganic hydraulic materials, and the mechanical properties of the composite materials are the macroscopic expression of its microstructure. Generally speaking, the microstructure of polymer cement mainly includes the following three categories, as shown in Figure 22.
Fig. 22 Microstructure of polymer cement
(a) Type I islands; (b) Two-phase continuity; (c) Type II island
Note: The dark part is inorganic phase and the bright part is polymer phase.
Type I sea-island structure mainly embodies the characteristics of polymer-modified cement materials, and waterproof mortar is a typical representative of this kind of structural products. In this structural form, the connecting phase "sea" is an inorganic phase and the dispersed "island" is an organic phase. "Sea" surrounds "Island", and "Island" is mutually inclusive. In this structural form, the inorganic phase establishes the skeleton structure of inorganic gel crystallization, and the polymer is filled in the gaps of the skeleton structure, which is mutually restrained with the inorganic phase, so the composite material changes from the original brittle material to the material with toughness in the middle. In addition to the great improvement of water resistance and impermeability, the compressive strength of the composite decreased, while the tensile strength, bending strength and bonding strength increased.
Type ⅱ sea-island structure is mainly characterized by flexible material with cement as filler and polymer as film-former, which does not belong to the category of polymer-modified cement. In this structural form, the "sea" of the continuous phase is the polymer phase and the "island" of the dispersion is the inorganic phase. This structural form of polymer cement mainly embodies the characteristics of soft and tough materials and has certain tensile elongation resistance.
Two-phase continuous structure is the transition period from I-type island structure to II-type island structure.
8-2 Technical Performance of Different Types of Products
At present, the special latex products for modified cement include: neoprene latex, styrene-butadiene latex, carboxyl styrene-butadiene latex, acrylate emulsion, epoxy emulsion and so on.
See table 17-34 for the main technical indexes of polymer cement waterproof mortar prepared with special latex.
Table 23 Technical Index of Polymer Cement Waterproof Mortar
Project technical indicators
Initial setting time ≥ 45min.
Final setting ≤ 10h
The compressive strength is 20-40 MPa.
The flexural strength is 5 ~ 6 MPa.
The bonding strength is 1.0 ~ 2.0 MPa.
Dry shrinkage < 0. 15%
Impermeability grade > P8
Frost resistance grade > f50
The technical properties of polymer cement waterproof mortar prepared with powder and emulsion two-component cementing agent or single-component cementing agent are shown in Table 23.
Table 24
Description of technical indicators of the project
Initial setting time > 45min 1: 2.5 water cement ratio.
The final setting is < 2h.
Compressive strength 4h > 10 MPa.
1d > 20 MPa
7d > 35mpa
Bending strength 4h > 2.5MPa
1d > 4.5 MPa
7d > 7.0
Permeability strength 1d > P8
28d > p 15； The penetration height of splitting test is1mm.
After 28 days of molding
7-day immersion > p 15, penetration height1mm.
8-3 Features and Scope of Application
Polymer cement mortar not only has excellent mechanical properties, but also has excellent crack resistance and impermeability, which is suitable for waterproof engineering of underground and above-ground buildings. It can be directly constructed on the wet base surface, especially suitable for infiltrating underground projects from the back as a waterproof layer; It is suitable for waterproofing works of civil air defense, culverts, underground passages, subways and underwater tunnels.
8-4 synthetic fiber polymer cement waterproof mortar
Brief introduction of synthetic fiber polymer cement
In the above polymer cement system, bundles of synthetic fibers, such as polypropylene and nylon 6 fibers, are introduced, which are randomly distributed in the hardened polymer cement body in three dimensions, so that the crack resistance of mortar can be further improved. The crack resistance of fiber polymer cement waterproof mortar is 1 times that of ordinary mortar, and the change of its crack resistance is shown in Table 25.
Crack resistance table 25
Description of crack resistance
Ordinary cement mortar is 2.49kj/m2 1: 2.5 lime-sand ratio.
Fiber polymer cement mortar 3.07kJ/m2
2. Technical properties of synthetic fibers (Table 26)
Table 26 Technical Index of Polypropylene Fiber
Project technical indicators
Density 0.9 1
The fracture strength (MPa) is 6.03× 102.
Coefficient of variation of elongation at break (%coefficient of variation (%)) 15. 10+00.
The modulus (MPa) is 4.64× 103.
3. Mix proportion of synthetic fiber polymer cement waterproof mortar
(1) fiber addition
The fiber length should be 0.9~ 1.9cm, and 0.9~ 1.2kg fiber can be added to each cubic meter of mortar.
(2) Mix proportion of polymer cement mortar
If you buy special latex, you should strictly follow the formula provided by the manufacturer.
If you buy single-component powder products and powder liquid products, you should strictly follow the formula provided by the manufacturer.
4. Construction of synthetic fiber polymer cement waterproof mortar
(1) The foundation treatment shall be carried out according to the requirements of 17-2-4-2.
(2) The construction operation shall be carried out according to the requirements of 17-2-4-4. The fiber polymer cement mortar shall not be plastered back and forth during construction, so as to avoid the mortar hollowing, and the first brushing time must be accurate.
(3) Curing: fiber polymer cement mortar should be cured by alternating dry and wet methods, generally by wet curing for 7d, dry curing for 25d, dry curing for 65d and dry curing for 27d. , or according to the maintenance method provided by the manufacturer.
9 steel fiber polymer cement waterproof mortar
1. Technical properties of steel fiber (Table 27)
Technical performance of steel fiber Table 27
Project technical indicators
Length 3.5 cm
Width 0.5 mm
Both sides of the shape are hooked, wavy and straight.
The modulus is 2. 1× 105 MPa.
2. Steel fiber polymer cement mortar
Short steel fiber is introduced into polymer cement waterproof mortar system because the elastic modulus of steel fiber is much larger than that of cement, and the three-dimensional random distribution of steel fiber can disperse the stress in hardened body and greatly improve the crack resistance of mortar. The crack resistance of ordinary steel fiber polymer cement mortar is 10~20 times greater than that of ordinary cement mortar. Therefore, the steel fiber polymer cement mortar system can be used in large-area plastering engineering.
3. Mix proportion of steel fiber polymer cement waterproof mortar
If you buy special latex, you should strictly follow the ratio provided by the manufacturer.
If you buy one-component powder or powder and liquid products, you should strictly follow the formula provided by the manufacturer.
The content of steel fiber is generally 10%~ 12% of the content of hydraulic materials.
4. Construction of steel fiber polymer cement waterproof mortar
(1) The foundation treatment shall be carried out according to the requirements of 4-2.
(2) The construction operation should be carried out according to the requirements of 4-4, and the following points should be paid attention to in the construction of steel fiber polymer cement mortar:
1) Generally, the thickness of steel fiber waterproof layer is 1cm, so it should survive together.
2) A polymer cement waterproof mortar protective layer of synthetic fiber must be made on the steel fiber waterproof layer to prevent the steel fiber mortar layer from being exposed to air and corroded by humid air.
(3) Maintenance: The alternate dry-wet maintenance method can be carried out according to the maintenance clauses in 8-4 synthetic fiber polymer cement waterproof mortar.