High-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and preparation method of high-strength shrinkage-reducing cement mortar

A steel fiber, high-strength technology, applied in the field of high-strength shrinkage-reducing cement mortar and its preparation, can solve the problems of accelerated crack development, entry, and mechanical properties of cement mortar.

Inactive Publication Date: 2022-04-12
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will lead to the entry of corrosive media such as water, air, and chloride ions from the outside, which will accelerate the development of cracks and eventually cause the overall specimen to lose its working performance.
Internal curing is an effective means of shrinkage reduction. At present, the commonly used internal curing agents include superabsorbent resin and polymerized lightweight aggregate, but their incorporation will lead to a significant decline in the mechanical properties of cement mortar

Method used

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  • High-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and preparation method of high-strength shrinkage-reducing cement mortar
  • High-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and preparation method of high-strength shrinkage-reducing cement mortar
  • High-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and preparation method of high-strength shrinkage-reducing cement mortar

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Experimental program
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preparation example Construction

[0023] The preparation method of high-strength anti-cracking cement mortar of the present invention comprises the following steps:

[0024] Weigh water, cement, silica fume, metakaolin, steel fiber, floating beads, and quartz sand. Stir the cement, silica fume, and metakaolin evenly, then add water and water reducer, stir until the cement mortar is thick, and then continue to add saturated perforated floating beads. Stir for 2 minutes and finally disperse and add steel fibers and stir until viscous and laitance-free, and the high-strength shrinkage-reducing cement mortar is obtained.

Embodiment 1

[0026] The high-strength shrinkage-reducing cement mortar described in the present invention is prepared from water, cement, silicon powder, metakaolin, quartz sand, water-saturated floating beads, steel fibers, and polycarboxylic acid high-efficiency water reducer. The mass ratio of water, cement, silica fume, metakaolin, quartz sand, and saturated floating beads is: 1042:4168:521:521:3600:286.

[0027] The dosage of the water reducing agent is 3% of the cementitious material, and the cementitious material includes cement, silica fume and metakaolin. The steel fiber volume dosage is 3%.

[0028] The cement is P·O52.5 ordinary Portland cement.

[0029] The purity of silicon powder is greater than 99.96%, and the apparent density is 2000kg / m 3 .

[0030] The fineness modulus of metakaolin is 1250 mesh, and the activity index is greater than 110.

[0031] The proportion of quartz sand is to mix 20-40 mesh, 40-60 mesh, 60-80 mesh, and 80-120 mesh quartz sand according to the ...

Embodiment 2

[0044] The high-strength shrinkage-reducing cement mortar described in the present invention is prepared from water, cement, silicon powder, metakaolin, quartz sand, water-saturated floating beads, steel fibers, and polycarboxylic acid high-efficiency water reducer. The mass ratio of water, cement, silica fume, metakaolin, quartz sand, and saturated floating beads is: 1042:4168:521:521:3200:574.

[0045] The dosage of the water reducing agent is 3% of the cementitious material, and the cementitious material includes cement, silica fume and metakaolin. The steel fiber volume dosage is 3%.

[0046]Repeat the experimental operation of Example 1 to obtain the cement mortar mixture. Put the cement mortar mixture into the mold, put it on the vibrating table for vibration, and install the mold twice. After the second mold loading, smooth it on the vibrating table until the plane is smooth, and remove the mold after 24 hours. Then put it into the curing room for standard curing, the...

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Abstract

The invention discloses high-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and a preparation method of the cement mortar. The cement mortar is prepared from water, cement, silicon powder, metakaolin, quartz sand, saturated floating beads, the steel fibers and a polycarboxylate superplasticizer. The mass ratio of the water to the cement to the silicon powder to the metakaolin to the quartz sand to the saturated floating beads is 1042: 4168: 521: 521: (2800-4000): (286-859). The volume mixing amount of the steel fiber is 3%, and the mixing amount of the polycarboxylic acid type water reducing agent is 3% of that of the cementing material. The excellent water saturation and water release performance of the floating beads are combined, quartz sand is replaced with the floating beads, the problem of self-constriction of low-water-binder-ratio cement mortar is solved, meanwhile, it is guaranteed that the strength of the cement mortar is not greatly reduced, and good practical application value is achieved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a high-strength shrinkage-reducing cement mortar mixed with steel fibers and floating beads and a preparation method thereof Background technique [0002] High-strength cement mortar with low water-cement ratio is widely used in engineering practice, but the cracking deformation caused by excessive early autogenous shrinkage is an urgent problem to be solved. Low water-cement ratio cement mortar because of its low water-cement ratio, the water inside the cement mortar is consumed during the cement hydration process, and the capillary tension generated inside leads to some micro-cracks, and the cracks continue to develop as time goes by, adding Influenced by changes in the external environment, the cement mortar shell will crack and deform. This will lead to the entry of external corrosive media such as water, air, and chloride ions, which will further accelerate the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/48C04B18/08
CPCY02W30/91
Inventor 冉涛庞建勇姚韦靖童格军
Owner ANHUI UNIV OF SCI & TECH
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