Ternary cementitious system support mortar

Abstract

The invention provides ternary cementitious system support mortar which comprises the following components in parts by weight: 20 to 60 parts of sulphoaluminate cement, 0 to 20 parts of ordinary portland cement, 0 to 10 parts of gypsum, 1 to 12 parts of microbead powder, 20 to 55 parts of quartz sand, 0.1 to 0.5 part of a water reducing agent, 0.01 to 0.5 part of a retarder, 0.01 to 0.2 part of anearly strength agent, 0.01 to 0.05 part of an expanding agent, 0.01 to 2 parts of rubber powder, and 0.01 to 0.2 part of an antifoaming agent. According to the invention, the sulphoaluminate cement,the ordinary portland cement and the gypsum are used as a ternary gelling system; additives such as the microbead powder, the water reducing agent, the retarder, the early strength agent, the expanding agent, rubber powder and the defoaming agent are added into the ternary gelling system, so that the support mortar material can meet the performance requirements of 'pot bearings for railway bridges', and particularly, after the microbead powder is added and has a synergistic effect, the prepared support mortar has good properties of segregation resistance, high early strength, high flow state and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a ternary cement system bearing mortar. Background technique [0002] Support mortar is a high-performance modified cement-based grouting material. It uses a variety of organic and inorganic additives. It has the characteristics of high strength, no shrinkage, and good durability. The support mortar can be leveled by itself and has a long operating time. After completion, the surface is smooth and flat, which overcomes the shortcomings of traditional mortar such as unevenness, easy cracking, peeling and powdering. [0003] In the bridge design of high-speed railways and railway passenger dedicated lines, for the installation of cast-in-place beam basin rubber bearings and cylindrical rigid bearings, the bearing mortar material needs to meet high durability, high strength, good working performance and economical considerations. sex. [0004] The basic requirements for...

AI Technical Summary

Problems solved by technology

[0004] The basic requirements for the mix ratio design of bearing mortar materials need to meet the industry standard TB / T2332-2013 "Basin Bearings for Railway Bridges" issued by the Ministry of Railways. Internal flow performance, etc., the existing patent CN101486545-expansion controllable super early strength bearing mortar material discloses a bearing mortar that can control expansion. It has micro-expansion filling properties. During use, in order to improve the working performance, the slurry often needs to have high fluidity. High fluidity will easily cause the support mortar to be divided into segregation, which will lead to uneven strength development, poor volume stability, and surface Problems such as low strength

Images