One-component negative-temperature early strength cement-based repair mortar

Abstract

The invention discloses a one-component negative-temperature early strength type cement-based repairing mortar. The repairing mortar comprises 35-40 wt% of special cement, 4-8 wt% of ordinary Portlandcement, 2-5 wt% of anhydrite, 1-2 wt% of silica fume, 40-50 wt% of quartz sands, 0.5-1.5 wt% of an early strength agent, 2-3 wt% of an antifreeze agent, 0.2-0.5 wt% of a water reducer, 1.2-2 wt% of redispersible latex powder, 0.01-0.025 wt% of a water retention thickener and 0.1-0.2 wt% of a defoamer; and the special cement is sulphoaluminate cement and / or high alumina cement. The repairing mortar of the invention can be used to perform ground repairing at a negative temperature of -5-0 DEG C, has the characteristics of fast hardness, early strength, and meeting of the mechanical properties of the repairing mortar at the negative temperature, and also has the advantages of simplicity in construction, and high construction efficiency.

Description

technical field [0001] The invention relates to a ground building material, in particular to a single-component negative temperature early-strength cement-based repair mortar. Background technique [0002] After long-term use of cement-based floors, under long-term loads and changes in the external environment, damage such as cracking, breaking, and sanding will occur, which affects normal use. Therefore, in order to repair the damaged parts, cement-based repair mortars are increasingly used. It is widely used in floor engineering. The condensation and strength of cement-based materials will be affected by temperature. Generally, they are used in an environment above 0°C. Otherwise, abnormal cement condensation will occur, and even the free water in the mortar that has not solidified will condense into ice, causing the mortar to expand. The final strength of the mortar is low, or even damaged and other abnormal conditions, so that the purpose of repairing the ground cannot ...

AI Technical Summary

Problems solved by technology

The condensation and strength of cement-based materials will be affected by temperature. Generally, they are used in an environment above 0°C. Otherwise, abnormal cement condensation will occur, and even the free water in the mortar that has not solidified will condense into ice, causing the mortar to expand. The final strength of the mortar is low, or even damaged and other abnormal conditions, so that the purpose of repairing the ground cannot be achieved

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