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Cement plastering mortar

A plastering mortar and cement technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of not being able to get water replenishment, not being able to compensate for shrinkage, etc., to reduce drying shrinkage and improve The effect of crack resistance

Inactive Publication Date: 2011-07-20
NANJING EFFUL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement plastering mortar is only 1-3cm thick when applied on the wall, and the water is absorbed by the wall substrate underneath, and the surface is blown by the wind and the sun to evaporate the water. The hydration of the cement itself also consumes water, and the cement mortar will soon be in a state of water shortage. , the outside world can not get water replenishment, the expansion agent stops hydration and cannot expand, and cannot play the role of compensating shrinkage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The mixing ratio is: in ordinary mortar: 100 points of cement, 200 points of medium and fine sand, 0.2 points of cellulose ether, 11 points of sulphoaluminate expansion agent, 0.1 points of super absorbent resin (SAP), 3 points of expanded perlite , the volume percentage of PP fiber in ordinary mortar is 0.5kg / m 3 . Consistency is controlled at 50-60mm, cured under natural conditions indoors, and the drying shrinkage value is 0.25×10 in 28 days -4 .

Embodiment 2

[0018] The mixing ratio is: in ordinary mortar: 100 points of cement, 200 points of medium and fine sand, 0.2 points of cellulose ether, 8 points of sulfoaluminate expansion agent, 0.1 point of super absorbent resin (SAP), 3 points of expanded perlite , the volume percentage of PP fiber in ordinary mortar is 1kg / m 3 , the amount of vinyl acetate and ethylene copolymer rubber powder is 3 minutes, the consistency is controlled at 50-60mm, and the drying shrinkage value in 28 days is 1.27×10 -4 .

Embodiment 3

[0020] The mixing ratio is: in ordinary mortar: 100 points of cement, 200 points of medium and fine sand, 0.2 points of cellulose ether, adding: 12 parts of sulphoaluminate expansion agent, 5 parts of expanded perlite, and the volume percentage of PVA fiber in ordinary mortar is 1.2kg / m 3 , the dosage of ethylene, vinyl chloride and vinyl laurate terpolymerized rubber powder is 6 points, the consistency is controlled at 50-60mm, and the drying shrinkage value in 28 days is 0.16×10 -4 .

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Abstract

The invention discloses cement plastering mortar, which comprises cement, medium and fine sand, a water-retaining thickener, polymer emulsion powder, an anti-cracking agent, an expanding agent and an internal curing agent. After the internal curing agent is mixed into the common cement plastering mortar, numerous 'miniature reservoirs' are established in the cement mortar; therefore, when the mortar lacks of water, the water in the internal curing agent can be slowly released for the continuous hydration of the cement and the expanding agent until the water is exhausted. Longer hydration time is provided for the expanding agent to generate more expanded crystals, namely ettringite. A drying shrinkage value of the cement mortar is reduced, and the crack resistance of the plastering mortar is improved.

Description

technical field [0001] The invention relates to a building engineering material, in particular to a cement plastering mortar for walls which can reduce drying shrinkage and improve crack resistance. Background technique [0002] Cement plastering mortar is an indispensable engineering material for building walls. However, cement plastering mortar is a brittle material with poor elastic deformation ability and large drying shrinkage value. Therefore, after wall plastering construction, cracking, swelling, and even falling off often occur after wall plastering construction. It has always been a major problem in wall plastering projects. problem. The prior art uses anti-crack fibers to increase the tensile strength of the mortar and limit the development of cracks. Another technique is to use polymers to improve the deformability of the mortar and reduce the occurrence of cracks. These two technologies are "resistance", one is "hard resistance" and the other is "soft resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/02Y02W30/91C04B14/06C04B14/185C04B14/204C04B20/0076C04B22/008C04B24/2623C04B24/2688C04B2103/0051C04B2103/46C04B2103/58C04B7/323C04B16/0633C04B16/0641C04B18/26C04B24/2641C04B2103/0059C04B2103/44C04B14/44C04B24/425
Inventor 唐绍林汤淑平万建东肖启明王彦梅徐红英刘丽娟唐修仁
Owner NANJING EFFUL
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