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Admixture special for motar of building

A construction sand and admixture technology, applied in the field of construction materials, can solve problems such as pollution, reduction of mortar strength, increase of mortar water/cement ratio, etc., and achieve the effects of reducing environmental pollution, improving construction efficiency, and low shrinkage

Inactive Publication Date: 2007-11-07
广西红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, materials with titles such as "mortar king" and "mortar essence" have appeared in the construction market, which can be used as substitutes for lime paste, but the main components are some cheap chemical cellulose materials and mortar microfoam agents, but simple The addition of cellulose viscosifier will increase the water / cement ratio of the mortar and reduce the strength of the mortar, while the simple use of mortar microfoam will introduce a large number of large-sized (up to 2mm) air bubbles into the mortar, which will also Seriously reduce the strength of mortar. In addition, the production of mortar microfoam will further restrict its use due to the pollution of the environment by the raw materials used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, the special admixture of building mortar is by methylcellulose 7% (percentage by weight, the same below), sodium dodecylbenzenesulfonate 7%, naphthalenesulfonic acid formaldehyde condensate 20%, calcium sugar 36%, Zeolite powder is formulated at 30%. Compared with the one without any admixture and the one with lime plaster, the mortar mixed with the present invention (the dosage is 0.2% of the cement weight) not only has improved workability and viscosity , and the degree of delamination was reduced by 65% ​​and 40%, the 28d compressive strength was increased by 12% and 20%, the bond strength was increased by 40% and 23%, and the shrinkage was reduced by 24% and 16%.

Embodiment 2

[0023] Example 2, the special admixture for construction mortar is formulated according to 7% of methyl cellulose, 3% of sodium dodecylbenzenesulfonate, 24% of naphthalenesulfonic acid formaldehyde condensate, 35% of calcium sugar, and 31% of zeolite powder , by adding 0.4% of the present invention by weight of cement, plastering mortars with strength grades of M5.0 and M10 can be prepared, and masonry mortars with strength grades of M5.0-M15 can also be prepared. Compared with the mortar without admixture, the setting time of the mortar with admixture can be extended by 2-5 hours.

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PUM

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Abstract

The present invention relates to a special additive for mortar. Said additive is formed from formaldehyde naphthalenesulfonate condensate, glycocalcium, methyl cellulose, sodium clodecyl benzene sulfonate and zeolite powder. The application of said invention can greatly improve cohesiveness, thickness, water-holding property, stability and construction property of the mortar, and can raise construction efficiency, reduce environmental pollution, can reduce water consumption and cement demand, and can raise strength and durability and can reduce shrinkage cracking hazard. Said invention is special applicable to building mortar, plaster and decorative plaster.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a special admixture for building mortar. Background technique [0002] Due to the low design strength level of building mortar (M2.5-M10), the amount of cement used in the preparation is less (200-300kg / m 3 ), and most of the materials are fine aggregates (yellow sand), general cement: yellow sand = 1:5-11, so although the strength of the mortar made by mixing can easily meet the requirements, the workability and constructability are quite poor. After that, it is easy to crack or even peel off, which seriously affects the construction quality. In order to improve the workability of construction mortar, the measure of adding lime paste has been widely used in construction engineering for a long time. Although the workability and constructability of mortar have been improved to a certain extent, it has an adverse effect on the water resistance of mortar. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B22/08C04B103/46
Inventor 孙振平蒋正武
Owner 广西红墙新材料有限公司