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Micro-expansion super early-strength bearing grout

A super-early-strength, grouting material technology, applied in construction, building maintenance, bridges, etc., can solve the problems of unable to meet the rapid anchoring and repair of concrete components, prolong the turnover period of equipment, and the support connection is not tight, etc., to achieve construction Good performance, no decrease in strength, no impact on the construction period

Inactive Publication Date: 2011-03-09
WUHAN HUAXUAN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluidity of traditional grouting materials is easy to lose, and the strength develops slowly. It usually requires more than 7 days of maintenance, which prolongs the equipment turnover period and affects the construction progress; and because the volume shrinks during the hydration process of the grouting material, it is easy to cause the support to be not tightly connected after installation. , affecting the construction quality
Such as the high-strength grouting material containing ultra-fine powder proposed in the patent CN101269943A, the initial fluidity is 285mm, and the 6h compressive strength is 20MPa. 20MPa, can not meet the requirements of rapid anchoring and repair of concrete components in the project

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First weigh the raw materials: 30kg of cement, 60kg of sand, 0.5kg of water reducer, 2kg of expansion agent, 0.1kg of retarder, and 10kg of reinforcing agent. Then put the sand, water reducer, expansion agent, retarder, and reinforcing agent into the mixer and mix for 5-10 minutes, then put the cement into the mixer evenly, continue to mix for 10-20 minutes, and finally pack it into bags.

[0011] When using, add 14% water according to the weight percentage, mechanically stir for 3-5 minutes, and then cast. The obtained grouting material has an initial fluidity of 330mm, a fluidity of 260mm in 30min, a compressive strength of 22.3MPa in 2h, a flexural strength of 10.6MPa in 24h, a compressive strength of 56.7MPa in 28d, and an expansion rate of 0.03% in 28d.

Embodiment 2

[0013] First weigh the raw materials: 40kg of cement, 50kg of sand, 1.5kg of water reducer, 3kg of expansion agent, 0.3kg of retarder, and 7kg of reinforcing agent. Then put the sand, water reducer, expansion agent, retarder, and reinforcing agent into the mixer and mix for 5-10 minutes, then put the cement into the mixer evenly, continue to mix for 10-20 minutes, and finally pack it into bags.

[0014] When using, add 15% water according to the weight percentage, mechanically stir for 3-5 minutes, and then cast. The obtained grouting material has an initial fluidity of 340mm, a fluidity of 265mm in 30min, a compressive strength of 26.1MPa in 2h, a flexural strength of 11.4MPa in 24h, a compressive strength of 58.7MPa in 28d, and an expansion rate of 0.04% in 28d.

Embodiment 3

[0016] First weigh the raw materials: 50kg of cement, 40kg of sand, 2.5kg of water reducer, 4kg of expansion agent, 0.5kg of retarder, and 5kg of reinforcing agent. Then put the sand, water reducer, expansion agent, retarder, and reinforcing agent into the mixer and mix for 5-10 minutes, then put the cement into the mixer evenly, continue to mix for 10-20 minutes, and finally pack it into bags.

[0017] When using, add 16% water according to the weight percentage, mechanically stir for 3-5 minutes, and then cast. The obtained grouting material has an initial fluidity of 335mm, a fluidity of 245mm in 30min, a compressive strength of 22.8MPa in 2h, a flexural strength of 10.7MPa in 24h, a compressive strength of 54.2MPa in 28d, and an expansion rate of 0.03% in 28d.

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Abstract

The invention provides a micro-expansion super early-strength bearing grout which comprises the following raw materials in parts by weight: 30-50 parts of cement, 40-60 parts of sand, 0.5-2.5 parts of water-reducing agent, 2-4 parts of expanding agent, 0.1-0.5 part of retarder and 5-10 parts of enhancer. The micro-expansion super early-strength bearing grout has the following advantages: (1) the working property is excellent, the initial fluidity reaches 320mm, and the fluidity at 30min is still above 240mm; (2) the early strength has rapid development, the strength at the late stage is not reduced, the compressive strength at 2h can be more than 20MPa, the compressive strength at 24h is more than 40MPa, the flexural strength is greater than 10MPa, and the compressive strength at 28d is greater than 50MPa; and (3) the micro-expansion super early-strength bearing grout has micro-expansion property. In view of the advantages, the micro-expansion super early-strength bearing grout can effectively improve the construction rate of a foundation bearing and other structures, and ensure the installation conformance and the construction quality of members.

Description

technical field [0001] The invention relates to a micro-expansion ultra-early-strength support grouting material, which is applied to bridge support gravity grouting, equipment foundation anchor bolt grouting, and rapid repair and reinforcement of concrete structures, and belongs to the technical field of cement-based grouting materials. technical background [0002] In recent years, the infrastructure is in a period of high-speed construction. In the process of bridge construction, the installation of a large number of prefabricated simply supported box girders and basin rubber bearings of cast-in-place girders is involved. It is necessary to grout the connecting parts of the box girder and the bearings. To play the role of support and fixation; in heavy machinery and other industries, when it comes to the installation and repair of large-scale equipment foundation supports, it is also necessary to grout the foundation bolts of the equipment, so that the equipment can run as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/04E01D19/04E02D27/44E04G23/02
Inventor 马保国张慢肖佳马玲魏定邦
Owner WUHAN HUAXUAN HIGH TECH
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