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Quick-hardening couplers based on gypsum-alumina expanding cement and Portland cement

Abstract

Quick-hardening couplers based on gypsum-alumina expanding cement and Portland cement

Bychkova O.A.

Incoming article date: 22.07.2018

The possibility of obtaining fast-hardening levelers for the floor (monolithic screeds) with a compression strength of more than 20 MPa based on gypsum-alumina expanding cement modified by Portland cement (MGRC) is shown. It is established that the kinetics of the compressive strength is mainly determined by the ratio of HZ:G:PTS МGGRC in the composition, the superplasticizer (SP) and esters of methyl cellulose have a negative impact on the buildup of strength in the early period and the value of design strength, as silica fume does not affect the kinetics of strength in the early period and the project age. The ratio of the limits of tensile strength in bending and compression influence internal structural stresses caused by the mismatch between the extension and strength growth in time due to different additive effects of SP and cellulose ethers on the kinetics of formation of hydrocortamate and calcium hydrosilicates.

Keywords: dry mortar, adhesion strength, gipsovoloknistyh expanding cement, glue quick fix