Cement mortar saltpetering inhibition additive

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...

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 efflorescence. After several months of wind and rain, there is no pan-alkaline phenomenon after outdoor observation of anti-pan-alkaline exterior wall finishing mortar, but the additive cost is high, and it is generally only suitable for the decoration of high-end residential and villa exterior walls