Saltpetering-preventing cement mortar and maintenance method

Abstract

The invention provides a saltpetering-preventing cement mortar and a maintenance method. The cement mortar comprises the following components: ordinary Portland cement, sand, ultrafine silicon powder,attapulgite powder, bentonite and cellulose ether. The surface of a paving material is immediately covered with a plastic film after the hard paving construction is finished. The saltpetering-preventing cement mortar has the advantages that the cement design strength and the economy can be ensured, the saltpetering is inhibited in the later period of cement mortar; and the film covering method after construction can accelerate the development of the internal structure of the cement mortar and accelerate the improvement of the closing amount of internal ducts of the cement mortar, so that thesaltpetering phenomenon is fundamentally reduced.

Description

technical field [0001] The invention relates to a cement mortar, in particular to an anti-pan-alkali cement mortar and a curing method. Background technique [0002] The hard pavement installed by the wet paste method is prone to pan-alkaline phenomenon on the surface and gaps of the hard pavement due to repeated encounters with rain or wet weather during use, which will not fade over the years and seriously affect the quality of the construction project. , also has a great influence on the bond strength between the layers inside the hard pavement. There are three main reasons for efflorescence: (1) materials such as cement, sand and admixtures contain soluble salt and alkali; (2) there are many pores in cement products with a certain moisture content; (3) soluble salt and Alkali, along with water, migrates to the surface through the pores, and precipitates on the surface or reacts with CO2 in the air to form white deposits. The traditional efflorescence treatment methods ...

AI Technical Summary

Problems solved by technology

The traditional efflorescence treatment methods are mainly divided into three categories: (1) water-proof treatment, coating a layer of water-proof agent on the hard pavement surface or the bottom surface of cement mortar, but because it will affect the bond strength of the mortar and the hard pavement (2) reduce the alkali content, but because the simple reduction of alkali content has a great influence on the strength of cement mortar, the effect is not ideal; (3) treat the surface regularly, but Due to treating the symptoms but not the root cause, the maintenance cost in the later period is high