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Modified cement-based self-leveling mortar and preparation method and application thereof

A self-leveling mortar and cement-based technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the inconsistent deformation of the interface between the self-leveling layer and the foundation layer, the volume shrinkage of the self-leveling layer, and the inconsistent deformation of the interface and other problems, to achieve self-leveling performance and impact resistance, good flexibility, simple preparation and application methods, and high mechanical properties

Inactive Publication Date: 2010-07-28
北京天维宝辰化学产品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) It is easy to cause dehydration of the thin-layer structure. On the one hand, due to the evaporation of free water, the dehydration of the self-leveling mortar thin-layer structure will cause drying and shrinkage, which will cause the mortar to crack, causing the mortar layer to leak and fall off; On the other hand, the self-leveling layer absorbs water, which makes the mortar lose water rapidly in the early stage
[0006] 3) When the cement-based self-leveling mortar does not have the waterproof function, after being affected by water erosion and temperature changes, the self-leveling layer is prone to thermal cracking, leakage, hollowing and shedding diseases
[0007] 4) It is easy to cause inconsistent deformation at the interface between the self-leveling layer and the base layer. The interface is hollow, and then cracks and falls off; on the other hand, due to the volume shrinkage of the self-leveling layer, the interface deformation between the two is inconsistent
[0008] 5) Chemical shrinkage is prone to occur. Since the volume of cement after hydration is smaller than the volume before the reaction, the total volume reduction is generally 7% to 9%. Due to partial shrinkage, it cannot be recovered.
Therefore, the chemical shrinkage caused by the cement hydration reaction will cause the volume change of the cement-based self-leveling mortar, which may lead to the generation of shrinkage cracks.

Method used

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Examples

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Effect test

preparation example Construction

[0033] The preparation method of the above-mentioned modified cement-based self-leveling mortar adopts the direct mixing method. First, the above-mentioned materials are calculated and weighed in proportion, and then they are mixed evenly in a dry-mixed mortar mixer before packaging, so as to obtain pure acrylic latex powder. Cement-based self-leveling mortar.

[0034] When the above-mentioned modified cement-based self-leveling mortar is applied, first add appropriate water, and evenly add the prepared self-leveling mortar during the stirring process, and then use an electric mixer to stir the mixture of mortar and water. In the mixture, the ratio of mortar to water is 1:0.2. In addition, in order to make the water and mortar mix faster and more fully, the ratio of water in the mixture can also be increased from 0.2 to 0.3. Therefore, in the mixture after stirring and molding, the ratio of mortar to water is 1:0.3. Among them, the stirring is divided into two times, the tim...

Embodiment 1

[0036] The invention provides a modified cement-based self-leveling mortar, which is composed of cement, anhydrite, water retention agent, retarder, lignocellulose, carbonate, defoamer, water reducer, aggregate, heavy calcium carbonate and Pure acrylic latex powder blended. Among them, the weight percentage of each material component is: aggregate 50%, cement 31%, anhydrite 13%, heavy calcium carbonate 5%, water retaining agent 0.05%, carbonate 0.05%, retarder 0.4%, wood 0.3% cellulose, 0.2% defoamer, 0.6% water reducer, 1.5% pure acrylic latex powder.

[0037] Among them, the cement is a composite cement synthesized by ordinary portland silicate cement and high alumina cement, or other composite cement that can replace the above composite cement, and the aggregate is one of quartz sand, river sand or industrial waste aggregates. The agent is one of cellulose ether or Wenlun rubber, the water reducer is one of melamine or polycarboxylic acid, the retarder is one of tartaric a...

Embodiment 2

[0041] The invention provides a modified cement-based self-leveling mortar, which is composed of cement, anhydrite, water retention agent, retarder, lignocellulose, carbonate, defoamer, water reducer, aggregate, heavy calcium carbonate and Pure acrylic latex powder blended. Among them, the weight percentage of each material component is: aggregate 60%, cement 35%, anhydrite 14%, heavy calcium carbonate 10%, water retaining agent 0.2%, carbonate 0.1%, retarder 0.6%, wood 0.5% cellulose, 0.25% defoamer, 0.7% water reducer, 3% pure acrylic latex powder.

[0042] Among them, the cement is a composite cement synthesized by ordinary portland silicate cement and high alumina cement, or other composite cement that can replace the above composite cement, and the aggregate is one of quartz sand, river sand or industrial waste aggregates. The agent is one of cellulose ether or Wenlun rubber, the water reducer is one of melamine or polycarboxylic acid, the retarder is one of tartaric aci...

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PUM

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Abstract

The invention relates to improved cement-based self-leveling mortar and a preparation method and application thereof. The improved cement-based self-leveling mortar comprises the following components in percentage by weight: 50%-70% of aggregate, 31%-40% of cement, 13%-15% of anhydrite, 5%-15% of ground calcium carbonate, 0.05%-0.3% of water-retaining agent, 0.05%-0.2% of carbonate, 0.4%-0.9% of retarder, 0.3%-0.9% of lignocellulose, 0.2%-0.3% of antifoaming agent, 0.6%-0.9% of water reducer and 1.5%-4.5% of pure acrylic emulsion powder. The invention has the advantages of simple preparation and application methods, good construction peaceability, good waterproofness, greatly reduced microcracks, high mechanical physics property, good self-leveling performance and impact resistance, and excellent flexibility; no cracking and shrinkage occur to constructed ground; and in addition, the invention can effectively solve the problems of complex site operation process, unstable mortar performance, environmental pollution and the like of the existing dual-component cement-based self-leveling mortar, thus the self-leveling mortar is a green building material because no toxic and harmful matter is contained.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a cement mortar, especially a modified cement-based self-leveling mortar, a preparation method and an application thereof. Background technique [0002] Cement-based self-leveling mortar is a kind of dry powder premixed mortar, which is widely used for leveling indoor floors of public buildings such as residences, hospitals, supermarkets, and light industrial floors. Cement-based self-leveling mortar has the characteristics of good fluidity, self-leveling, convenient construction and fast hardening in the new mixing state. The hardened cement-based self-leveling mortar has the characteristics of high compressive and flexural resistance, high bonding strength and good volume stability. Using cement-based self-leveling mortar to level the ground construction can greatly improve the construction efficiency and quality. [0003] However, the existing cement-based self-leveling mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B2111/34C04B2111/62C04B2111/50C04B2103/302C04B2111/27C04B2111/00017C04B2111/2046C04B28/16C04B2103/46C04B2111/343Y02W30/91C04B7/00C04B14/06C04B14/068C04B14/28C04B18/24C04B22/10C04B24/2641C04B40/0608C04B2103/20C04B2103/50C04B18/141C04B24/38C04B24/383C04B24/223
Inventor 朱立德孙东娟王义
Owner 北京天维宝辰化学产品有限公司
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