Cement mortar saltpetering inhibition additive

A cement mortar and additive technology, which is applied in the field of cement mortar inhibitor efflorescence additive, can solve the problems of small pore size, low porosity of facing mortar, high additive cost, etc., and achieve the effect of preventing migration, accelerating setting time and reducing porosity

Inactive Publication Date: 2010-12-15
JIANGSU NIGAO SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because high alumina cement does not produce calcium hydroxide during hydration, and suitable additives make the formed facing mortar have low porosity, small pore size, greatly reduce the migration path of salt solution, and fundamentally eliminate the conditions for the production of efflore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The following formula adds the cement mortar inhibitor efflorescence additive to the cement mortar, and compares the addition amount of the cement mortar inhibitor efflorescence additive.

[0025] 1. Formula

[0026] Raw material name

1#

2#

3#

P.042.5 Cement

300g

300g

300g

fine aggregate

699.5g

679.5g

659.5g

Cellulose ether

0.5g

0.5g

0.5g

Cement Mortar Inhibiting Efflorescence Additives

0g

20g

40g

total

1000g

1000g

1000g

[0027] 2. Preparation of test pieces and test observation

[0028] Mix the components of the above 1#, 2#, 3# formulations evenly, add 16% water respectively, stir evenly with a mixer, and prepare test specimens according to the standard JC / T 1024-2007. After the cycle test, after adding cement mortar additives to inhibit efflorescence, the layer obtained by 1# formula has severe efflorescence, the coating obtai...

Embodiment 2

[0030] 1. Formula

[0031] The following formula cement mortar suppresses efflorescence additives without highly active mineral fillers

[0032] Raw material name

4#

P.042.5 Cement

300g

fine aggregate

694.5g

Cellulose ether

0.5g

Cement Mortar Inhibiting Efflorescence Additives

5g

total

1000g

[0033] 2. Preparation of test pieces and test observation

[0034] Mix the components of the above 4# formula evenly, add 16% water, stir evenly with a mixer, and prepare test specimens according to the standard JC / T 1024-2007. After the cycle test, the coating obtained by the 4# formula has more efflorescence, which shows that the highly active mineral filler has an important influence on the improvement of efflorescence.

Embodiment 3

[0036] 1. Formula

[0037] The following formula cement mortar inhibits efflorescence additives without complexing resins

[0038] Raw material name

[0039] 2. Preparation of test pieces and test observation

[0040] Mix the components of the above 5# formula evenly, add 16% water, stir evenly with a mixer, and prepare test specimens according to the standard JC / T 1024-2007. After the cycle test, the coating obtained by the 5# formula has a small amount of efflorescence, which shows that the complexing resin has a certain effect on improving the efflorescence.

[0041] The invention adopts highly active mineral fillers and complex resins as main raw materials, mixes them with special additives uniformly to form the efflorescence-inhibiting additives for cement mortar, and determines the 3# formula (4% content) as the optimal formula. Test the performance of the mortars of 1# and 3# formulas, and the performances are as follows:

[0042] performance

[0...

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PUM

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Abstract

The invention provides a cement mortar saltpetering inhibition additive capable of obviously inhibiting mortar saltpetering, comprising the following materials in percentage by weight: 75%-90% of high-activity mineral fillers, 3%-5% of complexing resin and 10%-15% of additives. The invention enhances the mortar compactness and consumes the free calcium ions by reacting the high-activity mineral fillers with redundant calcium hydroxide contained in cement hydration products, constraints the early calcium ion migration by adding the complexing resin, reduces the water absorption quantity of mortar by adding a water-repelling agent, a defoaming agent, a superplasticizer, and the like, decreases the carriers for the calcium ion migration and effectively inhibits the saltpetering forming conditions, thereby achieving the effect of inhibiting the cement mortar saltpetering; and in addition, the cement mortar saltpetering inhibition additive has excellent performance, reasonable formula and low cost and can be used for preparing better cement mortar which is difficult to generate the saltpetering and be suitable for the decoration of inner and outer walls of common residences or plants.

Description

technical field [0001] The invention relates to an additive, in particular to a cement mortar inhibitory additive for cement mortar which can obviously inhibit the efflorescence of the cement mortar. Background technique [0002] Cement mortar is prepared by cement, fine aggregate (also known as fine aggregate), water, etc. in an appropriate proportion. Since the hydration product of cement, calcium hydroxide, dissolves in the water film layer attached to the hole wall to form Ca 2+ and OH - . CO2 gas in the atmosphere diffuses into the pores and dissolves in the same water film layer above, partly forming carbonic acid (H 2 CO 3 ), the neutralization reaction between calcium hydroxide and carbonic acid forms almost insoluble CaCO 3 Precipitation, forming ubiquitous alkaloids. The efflorescence seriously affects the sensory quality of cement mortar, especially for the colored plastering mortar and tile joint filler used for exterior wall decoration. The decorative effe...

Claims

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Application Information

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IPC IPC(8): C04B24/28C04B22/00
CPCC04B2111/21C04B40/0039
Inventor 吴开胜朱国峰钱中秋
Owner JIANGSU NIGAO SCI & TECH
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