Rapid hardening high-strength grouting material

Abstract

The invention discloses a rapid hardening high-strength grouting material, which consists of the following components in percentage by weight: 40 to 55 percent of fast hardening sulphoaluminate cement, 40 to 55 percent of quartz sand, 1 to 5 percent of silicon micro-powder, 2 to 5 percent of high-calcium powder, 0.6 to 1.0 percent of FDN water reducer, 1 to 3 percent of anhydrite powder, 0.02 to 0.14 percent of lithium carbonate, and 0.2 to 1.4 percent of sodium chloride. The components are uniformly mixed, and stirred with water in a water/cement ratio of 0.14-0.18, and the grouting material can be used after uniform stirring. The grouting material is suitable for low-temperature construction, and has the characteristics of early strength, high strength, good flowing performance, no shrinkage, good anti-freezing effect and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a fast-hardening high-strength grouting material. Background technique [0002] The grouting material is made of high-strength materials as aggregate, cement as gelling agent, and supplemented with high fluidity, micro-expansion, anti-segregation and other substances. It adds a certain amount of water at the construction site, and it can be used after stirring evenly. The grouting material is mainly used for: anchoring of anchor bolts, machine base, steel structure and foundation interface, secondary grouting of equipment foundation, planting steel bars and installation of electromechanical equipment, etc. , high strength, no shrinkage, micro expansion and other requirements. The traditional grouting materials mainly include epoxy resin quartz sand and ordinary Portland cement mortar, whose efficacy is difficult to meet the above requirements. Epoxy quartz sand has ...

AI Technical Summary

Problems solved by technology

The traditional grouting materials mainly include epoxy resin quartz sand and ordinary Portland cement mortar, and its efficacy is difficult to meet the above requirements

The production cost of epoxy resin quartz sand is high, the bonding force with steel structure and concrete is poor, and the durability is poor

Ordinary cement mortar grouting material grows slowly in strength and shrinks when dried, which reduces the strength in the later stage. Especially at low temperature, the grouting material will shrink to a certain extent before and after hardening. Among them, the settlement shrinkage has the greatest influence, which may easily lead to incomplete filling. As a result, the transmission of the load is affected, and the installation accuracy and service life of the equipment are greatly affected.

In addition, under negative temperature conditions, ordinary cement mortar grouting materials cannot be constructed, which affects the construction period

Secondly, a small number of grouting materials are equipped with antifreeze agents. Most of these antifreeze agents use sodium nitrite as the antifreeze component, supplemented by sodium sulfide as the early strength component and other components, and sodium nitrite, sodium sulfate and calcium nitrate will cause alkali one. Aggregate reflection, resulting in reduced durability of concrete, cracking damage, and too many antifreeze additives will make the preparation process complicated, cost increased, and greatly pollute the environment