Low-temperature super early strength support grouting material for high-speed rail

Abstract

The invention provides a low-temperature super early strength support grouting material. The low-temperature super early strength support grouting material comprises the following components in percentage by weight: 20 to 60 percent of high early strength cement, 2 to 10 percent of double quick cement, 30 to 65 percent of quartz sand, 0.05 to 0.5 percent of quick-dissolving sodium silicate, 0.05 to 0.8 percent of early strength agent, and 0.5 to 1 percent of freeze proof agent. The low-temperature super early strength support grouting material has high mobility, hour intensity, and cryogenic property and a good penetration and crystallization function, and is suitable for installation of a high iron basin type rubber support under the condition of low temperature or negative temperature.

Description

Technical field: [0001] The invention relates to a low-temperature ultra-early-strength bearing grouting material for high-speed railways and a preparation method thereof, in particular to a super-early-strength bearing mortar used for installing high-speed railway bridge basin rubber bearings under low temperature conditions. Background technique: [0002] With the rapid development of my country's economy, high-speed railways and passenger-dedicated railways are being constructed on a large scale at an unprecedented speed in our country. Different from traditional railways, high-speed railways use a large number of bridge structures, and the rapid installation of box girders places high demands on the support mortar. Under normal circumstances, only when the compressive strength of the mortar reaches more than 20MPa, the hoisting machine can loosen the box girder for the next step. Therefore, a kind of mortar with good fluidity, high hourly strength, micro-expansion and st...

AI Technical Summary

Problems solved by technology

At present, the existing domestic high-speed rail support grouting materials generally have unstable fluidity, are greatly affected by the environment, and the strength develops slowly, especially under low temperature and negative temperature conditions, it often takes a long time to reach the specified strength. Greatly reduced the construction progress of the project

Chinese patent CN1356285A relates to a rapid grouting material used in emergency repair construction. The initial fluidity of this material can reach 240mm, and the compressive strength in 6 hours can reach 20MPa, but it cannot meet the requirements of the "Temporary Provisional Technical Conditions" (Ministry of Railways Science and Technology Department Science and Technology Ji [2005] No. 101) Requirements for the properties of prefabricated simply supported beam support grouting materials

Patent CN200810100968.6 mentions a rapid grouting material specially used for the installation of basin-type rubber bearings of passenger-dedicated line bridges. Although the initial fluidity of this material is greater than 320mm, the half-hour strength is greater than 240mm, and the two-hour compressive strength can reach 20MPa Above, but when the temperature is lower than 10°C, the strength growth of the material will be greatly restricted, and the time to reach the specified compressive strength will be more than doubled. At the same time, this characteristic will become more obvious as the temperature further decreases.