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Anticrack waterproof agent for cement-base material

An anti-crack waterproofing agent and cement-based material technology, which is applied in the field of anti-crack waterproofing materials, can solve the problems of loss of concrete impermeability, waterproof measures cannot achieve waterproof effect, and can not effectively reduce shrinkage and cracking due to water loss. Impermeability, the effect of preventing shrinkage cracking

Inactive Publication Date: 2007-11-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can improve the impermeability of concrete to varying degrees, but none of them can effectively reduce the dehydration shrinkage cracking in the plastic state of concrete, and once the plastic shrinkage cracks appear in the concrete, the waterproof measures will not achieve the waterproof effect, and the concrete’s water resistance will not be effective. permeability is completely lost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The mass ratio of anti-cracking waterproofing agent is:

[0044] Polypropylene fiber (trilobal shape, fiber equivalent diameter 34μm, fiber length 20mm) 8%

[0045] SN-II superplasticizer 18%

[0046] Class II fly ash 25%

[0047] Calcium Sulfate 25%

[0048] Sodium Sulfate 18%

[0049] Bentonite 6%

[0050] When the anti-cracking and waterproofing agent is mixed with cement mortar (32.5 ordinary cement: medium sand: water = 1: 1: 0.5) with 0.03% of the cement mass, the reduction rate of plastic shrinkage cracking is about 80% measured by the plate method , Compared with the fluidity, the impermeability (expressed in water seepage pressure) can be increased by about 300%, the compressive strength and flexural strength are increased by 35% and 30%, respectively, and the impact strength is increased by 50%. The frost resistance is improved by 100%, and the drying shrinkage of the mortar at the age of 28 days is reduced by about 10%.

Embodiment 2

[0052] The mass ratio of anti-cracking waterproofing agent is:

[0053] Polypropylene fiber (trilobal shape, fiber equivalent diameter 34μm, fiber length 15mm) 5%

[0054] Ceramic fiber (alumina content 45%, fiber diameter 3μm, fiber length 5mm) 5%

[0055] FDN superplasticizer 20%

[0056] Class II fly ash 25%

[0057] Calcium Sulfate 25%

[0058] Sodium Sulfate 18%

[0059] Methylcellulose 2%

[0060] When the anti-cracking and waterproofing agent is mixed with cement mortar (32.5 ordinary cement: medium sand: water = 1: 1: 0.5) with 0.03% of the cement mass, the reduction rate of plastic shrinkage cracking is about 90% measured by the plate method , Compared with the fluidity, the impermeability (expressed in water seepage pressure) can be increased by about 350%, the compressive strength and flexural strength can be increased by 35% and 40%, respectively, and the impact strength can be increased by 100%. The frost resistance is increased by 150%, and the drying shrinka...

Embodiment 3

[0062] The mass ratio of anti-cracking waterproofing agent is:

[0063] Nylon fiber (round, straight, fiber diameter 43μm, fiber length 20mm) 10%

[0064] Glass fiber (zirconia content 6%, fiber diameter 13μm, fiber length 10mm) 4%

[0065] SM superplasticizer 25%

[0066] S105 slag powder 21%

[0067] Calcium Sulfate 20%

[0068] Sodium Sulfate 10%

[0069] Bentonite 10%

[0070] When the anti-cracking and waterproofing agent is mixed into cement concrete (32.5 ordinary cement: 5-25mm crushed stone: medium sand: water = 1: 0.75: 0.75: 0.5) with 0.05% of the cement mass, its effect on plastic shrinkage is measured by the plate method The reduction rate of cracking is about 95%, and the impermeability (expressed in water seepage pressure) can be increased by about 400%, and the compressive strength and flexural strength can be increased by 40% and 40% respectively. , The impact strength is increased by 300%, the frost resistance is increased by 200%, and the drying shrink...

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Abstract

The present invention is one kind of anticrack waterproof agent for preventing the shrinkage and cracking of cement-base material in plastic state and raising the anti-seepage ability of hardened cement-base material. The anticrack waterproof agent consists of plastic concrete crack preventing component and hardened concrete seepage preventing component. The anticrack waterproof agent can reduce plastic shrinkage cracking of cement-base material, such as mortar and concrete, from initial solidification to final solidification by 80-100 %, and raise the exudation pressure of hardened concrete by 300-500 %. The present invention may be used widely in underground continuous cement concrete wall, basement, water processing pond, roofing, terrace, revetment, dam and other engineering.

Description

technical field [0001] The invention belongs to the technical field of material science and construction engineering, and in particular relates to a crack-resistant waterproof material used for cement-based materials (cement paste, mortar, concrete). technical background [0002] Concrete is one of the largest and most widely used building materials in the world. At present, my country's annual concrete consumption has reached about 1 billion cubic meters. By 2010, the amount of concrete used in my country will more than double from the current level. Therefore, for a long period of time in the future, concrete will still be the main building material of modern engineering construction in our country. And because of its wide application range, low price, easy casting and durability, and the effective use of industrial solid waste to produce energy-saving and environmentally friendly building materials, it plays an irreplaceable role in many construction engineering fields....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B16/06C04B14/38C04B24/00C04B22/14C04B103/60
Inventor 马一平
Owner TONGJI UNIV
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