Mortar

Abstract

The invention discloses a mortar, which comprises the following parts: 250-350 parts of low-alkaline special typed cement, 0-250 parts of common silicate cement, 0-200 parts of calcium sulfate, 300-2400 parts of filler or aggregate, 2-20 parts of cellulose, 10-400 parts of redispersion polymer gel powder or 10-400 parts of polymer emulsion, 2-20 parts of fiber, 0.5-10 parts of retarder and 3-25 parts of instant coagulant. The low-alkaline cement contains the following clinker with 15%-35% C4A3S, 15%-35% C2S, 0%-35% C3S, 4%-15% CaSO4, 0%-15% C4AF and 0%-5% C3A . The mortar with low-alkaline cement and water can be preserved for 1-7d, whose pH value is 8-9.5.

Description

technical field [0001] The invention relates to a bonding material for construction, in particular to a mortar. Background technique [0002] The existing dry powder mortar or two-component polymer mortar adopts ordinary Portland cement (gray cement or white cement), lime calcium powder or slaked lime powder, quartz sand, calcium carbonate powder (heavy calcium, double fly powder, limestone powder) , wollastonite powder or talc powder, etc., then add methyl or hydroxypropyl methylcellulose, fiber, etc., and add redispersible polymer powder to make dry powder mortar or make two-component polymerization together with polymer emulsion material mortar. The above-mentioned mortar can be used as the bonding mortar and plastering mortar layer of the external thermal insulation system of the external wall, the putty layer of the internal and external walls of the building, can be used as the adhesive and jointing agent of marble, granite, and ceramic tile, and can be used as Repai...

AI Technical Summary

Problems solved by technology

The main inorganic binders of the above-mentioned mortar are ordinary portland cement and lime calcium powder or slaked lime powder. The pH value of this inorganic binder after adding water is 13 or 14, and the alkalinity is very high. Strong knot strength, high brittleness, dry shrinkage, carbonation shrinkage, easy to cause cracking and drumming of the dried mortar layer, etc. High alkalinity is more corrosive to polymers, and more corrosive to glass fiber mesh cloth. It is easy to cause the mesh cloth in the plastering mortar layer of the external thermal insulation system to break, the plastering layer to fall off, and the surface coating to be pan-alkali, etc. When pasting granite, marble, etc., it is easy to cause the phenomenon of regret and moisture on the stone surface

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