Gravity filling mortar

Abstract

The invention relates to gravity filling mortar, which is characterized by consisting of the following components in percentage by weight: 40 to 60 percent of sulphoaluminate cement, 0.05 to 1 percent of water reducing agent, 0.01 to 0.1 percent of retarder, 0.005 to 0.05 percent of early strength agent, 0.001 to 0.01 percent of stabilizer, 0.01 to 0.1 percent of antifoaming agent and the balanceof aggregate. The various performance indexes of the gravity filling mortar are superior to those of the traditional filling mortar and other similar products; and initial fluidity is more than or equal to 360mm, the retention value of 30mm fluidity is more than or equal to 340mm, 2h compressive strength is more than or equal to 20MPa, 1d compressive strength is more than or equal to 50MPa, 28d compressive strength is more than or equal to 60MPa, 56d compressive strength is not less than 28d strength, 90d compressive strength is not less than 56d strength, 1d vertical expansivity is more thanor equal to 0.02 percent, 28d shrinkage is less than or equal to 0.1 percent, and bleeding and settlement are avoided.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a gravity filling mortar. Background technique [0002] High-fluidity and high-strength gravity-filled mortar was originally issued by Beijing-Shanghai High-speed Railway Co., Ltd. and China Academy of Railway Sciences in January 2011, "Interim Technical Requirements for Gravity-filled Mortar for Beijing-Shanghai High-speed Railway Sound / Wind Barrier" In order to propose a special engineering material, many domestic scientific research institutions and enterprises and institutions have actively developed and researched it, and have achieved relatively good technological breakthroughs, but it is difficult to meet the technical requirements of various indicators at the same time. For example, the gravity mortar of Zhengzhou Zhubang Building Materials Company and Changsha Jiaotai Company has good 28-day compressive strength, but the fluidity and early strength of the mortar are unq...

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Problems solved by technology

[0002] High-fluidity and high-strength gravity-filled mortar was originally issued by Beijing-Shanghai High-speed Railway Co., Ltd. and China Academy of Railway Sciences in January 2011, "Interim Technical Requirements for Gravity-filled Mortar for Beijing-Shanghai High-speed Railway Sound / Wind Barrier" In order to propose a special engineering material, many domestic scientific research institutions and enterprises and institutions have actively developed and researched, and have achieved relatively good technological breakthroughs, but it is difficult to meet the technical requirements of various indicators at the same time.

For example, the gravity mortar of Zhengzhou Zhubang Building Materials Company and Changsha Jiaotai Company has good 28-day compressive strength, but the fluidity and early strength of the mortar are unqualified, which is mainly due to the mismatch between the cement base material and the admixture components. The technical index of gravity mortar of Henan Dittman Company just meets the standard requirements, but it does not have obvious advantages and needs to be further improved

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