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Preparation method of super light foam concrete waterproof coating and obtained super light foam concrete with ultralow water absorption rate

A foamed concrete and waterproof coating technology is applied in the fields of improving the waterproofness of ultra-light foam concrete, preparation of ultra-light foam concrete waterproof coating, and ultra-low water absorption and ultra-light foam concrete, which can solve the problem of increased thermal conductivity and thermal insulation effect. problems such as decrease and increase in water absorption rate, to achieve the effect of reducing mass water absorption rate, reducing water absorption rate, and reducing volume water absorption rate

Active Publication Date: 2019-05-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the incorporation of some water-absorbing agents can also cause poor compatibility with cement, insufficient durability, surface peeling, cracking, and shedding after a long time, which will cause the water absorption rate of porous cement-based materials to increase again, resulting in an increase in thermal conductivity. , the insulation effect is reduced, etc.

Method used

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  • Preparation method of super light foam concrete waterproof coating and obtained super light foam concrete with ultralow water absorption rate
  • Preparation method of super light foam concrete waterproof coating and obtained super light foam concrete with ultralow water absorption rate
  • Preparation method of super light foam concrete waterproof coating and obtained super light foam concrete with ultralow water absorption rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Applying a waterproof coating on the surface of ultra-light foam concrete includes the following steps:

[0053] Step 1: Prepare ultra-light foam concrete: use a single sulphoaluminate cement as the cementitious material, first add mixing water (water-cement ratio 0.4-0.43) and stir for 3 minutes to form a cement slurry; add prefabricated cement to the cement slurry Foam (foam accounts for 30-40% of the cement mass, and the foam density is 72 kg / m3) is stirred for 3 minutes to form a foamed cement paste; the foamed cement paste is molded and cured at 25 °C, and the mold is removed after 1 day , and then moved to a foam box for 7 days of curing at 25 °C, taken out, dried at 60 °C to constant weight, and cooled to room temperature to obtain ultra-light foam concrete. The porosity is detected by ZEISS Xradia 510 Versa nano-CT, the total porosity is 89.2%, and the dry density is ≤300 kg / m 3 . The microscopic morphology of ultra-light foamed concrete cells is as follows: ...

Embodiment 2

[0062] Step 1: prepare ultra-light foam concrete: same as embodiment 1.

[0063] Step 2: Cut the test block into small rectangular parallelepiped pieces of 5 cm×4 cm×3 cm with a carving knife, gently brush off the shedding on the surface of the sample with a small brush, and weigh the mass of the sample with an analytical balance.

[0064] Step 3: Apply the first waterproof coating: Same as Example 1, the difference is that the first waterproof layer solution uses the following samples respectively: No. ① sample: 5.3 mL of 5‰ polyacrylamide aqueous solution, hexadecyl Trimethoxysilane 4.0mL, nano-silica dispersion 10.7mL; No. 2 sample: 5.7mL 5‰ polyacrylamide aqueous solution, hexadecyltrimethoxysilane 3.0mL, nano-silica dispersion 11.3mL; Sample ③: 3.1mL 5‰ polyacrylamide aqueous solution, 4.5mL hexadecyltrimethoxysilane, 12.4mL nano-silica dispersion; sample ④: 5.3mL 7‰ polyacrylamide aqueous solution, Alkyltrimethoxysilane 4.0mL, nano-silica dispersion 10.7mL; No. ⑤ sample...

Embodiment 3

[0071] Step 1: prepare ultra-light foam concrete: same as embodiment 1.

[0072] Step 2: Cut the test block into small rectangular parallelepiped pieces of 5 cm×4 cm×3 cm with a carving knife, gently brush off the shedding on the surface of the sample with a small brush, and weigh the mass of the sample with an analytical balance.

[0073] Step 3: Apply the first waterproof coating: Same as in Example 1.

[0074] Step 4: Brush the second waterproof coating: Same as Example 1, the difference is that the second waterproof layer solution uses the following samples respectively: No. ① sample: hexadecyltrimethoxysilane 10.0mL, nanometer two Silica dispersion 10.0mL; No. ② sample: 6.7 mL hexadecyltrimethoxysilane, 13.3 mL nano-silica dispersion; ③ No. sample: 5.0 mL hexadecyl trimethoxysilane, nanometer silica Silica dispersion 15.0mL; sample ④: hexadecyltrimethoxysilane 4.0mL, nano-silica dispersion 16.0mL; sample ⑤: hexadecyltrimethoxysilane 3.3mL, nano-silica Silicon oxide disp...

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Abstract

The invention discloses a preparation method of a super light foam concrete waterproof coating and obtained super light foam concrete with ultralow water absorption rate. The waterproof coating comprises three layers; the first waterproof coating has the active ingredients of polyacrylamide, hexadecyltrimethoxysilane and nanometer silicon dioxide; the second waterproof coating has the active ingredients of mixtures of hexadecyltrimethoxysilane and nanometer silicon dioxide; the third waterproof coating has the active ingredients of hexadecyltrimethoxysilane. The method has the advantages thatthe application range is wide; the method can be applicable to various kinds of super light foam concrete; the internal mixing of waterproof agents is not needed; the operation is simple and convenient; the implementation is easy; after the coating of the waterproof coating, the waterproof performance of the super light foam concrete is improved; the water absorption rate is reduced; the originalexcellent performance of the super light foam concrete cannot be changed; the combination power between the waterproof coating and the super light foam concrete is good; the intensity of the super light foam concrete can be enhanced.

Description

technical field [0001] The invention relates to a method for improving the water resistance of ultra-light foamed concrete, in particular to a method for preparing a waterproof coating of ultra-light foamed concrete, and also relates to an ultra-low water-absorbing ultra-light foamed concrete specifically for the waterproof coating, which belongs to construction The technical field of material waterproofing treatment. Background technique [0002] With the increase in population, the pressure on environmental resources is increasing, and it is imminent to build a resource-saving and environment-friendly living pattern. Building energy consumption accounts for more than 30% of the total energy consumption in society. The Ministry of Housing and Urban-Rural Development has proposed strict energy-saving standards, and major domestic cities have also taken the lead in implementing 65% energy-saving design standards. Against this background, foam concrete has been favored by ma...

Claims

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Application Information

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IPC IPC(8): C04B41/52
Inventor 张秀芝张冬久杨清薛瑞张洁张颖
Owner UNIV OF JINAN
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