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Anti-crack cement mixture and preparation method thereof

A technology of mixture and cement, which is applied in the field of building material production, can solve problems such as cracks or damage on the ground, affect the overall strength of concrete blocks, and shorten life, so as to enhance hardness and frost resistance, improve brittleness and toughness, and improve performance effect

Inactive Publication Date: 2020-02-21
内蒙古高速公路集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, after the existing cement is poured into concrete blocks in the later stage, after a period of use, the ground is prone to cracks or damage on the spot, which affects the overall strength of the concrete blocks and shortens its service life.

Method used

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  • Anti-crack cement mixture and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method for the above-mentioned anti-cracking cement mixture, comprising the steps of:

[0041] Step S1, mixing cement, sand, oil shale ash and mineral powder to obtain a first mixture;

[0042] Step S2, grinding anhydrite to obtain 120-170 mesh anhydrite powder; mixing anhydrite powder, fibers and additives to obtain a second mixture;

[0043] Step S3, mixing the first mixture with the second mixture to obtain coarse cement;

[0044] Step S4, grinding the coarse cement material to 320-380 mesh to obtain an anti-cracking cement mixture;

[0045] There is no time sequence limitation between the step S1 and the step S2.

[0046]In the present invention, cement, sand, oil shale ash and slag are mixed in step S1 to obtain the first mixture. In this step S1, the mixing method is preferably stirring. The stirring speed is preferably 900-1200 rpm, more preferably 1000-1100 rpm. The stirring time is preferably 25-45 min, mor...

Embodiment 1

[0053] 46 parts of cement, 22 parts of sand, 19 parts of oil shale ash and 5 parts of mineral powder were mixed in a mixing tank at a stirring speed of 1000 rpm for 30 minutes to obtain the first mixed material. The anhydrite was ground by ball milling, the speed of the grinder was 500r / min, and the anhydrite was ground for 30min. After grinding, the anhydrite powder was sieved to obtain 120-mesh anhydrite powder. Mix 4 parts of anhydrite powder, 0.8 part of fiber and 0.5 part of admixture in a mixing tank at a stirring speed of 360 rpm for 18 minutes to obtain a second mixture. The first mixture and the second mixture are mixed to obtain coarse cement material. The cement coarse material is transported to a grinder by a conveyor belt for grinding at a rotational speed of 16 rpm for 40 min to 320 mesh to obtain a crack-resistant cement mixture.

Embodiment 2

[0055] 78 parts of cement, 30 parts of sand, 21 parts of oil shale ash and 8 parts of mineral powder were mixed in a mixing tank at a stirring speed of 900 rpm for 25 minutes to obtain the first mixed material. The anhydrite was ground by means of ball milling, the rotational speed of the grinder was 450r / min, and the anhydrite was ground for 20min. After grinding, the anhydrite powder was sieved to obtain 130-mesh anhydrite powder. 7 parts of anhydrite powder, 3.2 parts of fiber and 1.2 parts of admixture were mixed in a mixing tank at a stirring speed of 420 rpm for 26 minutes to obtain a second mixed material. The first mixture and the second mixture are mixed to obtain coarse cement material. The cement coarse material is transported to a grinder by a conveyer belt for grinding at a rotational speed of 20 rpm for 50 min to 340 mesh to obtain a crack-resistant cement mixture.

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Abstract

The invention provides an anti-crack cement mixture and a preparation method thereof, and relates to the technical field of building material production, wherein the anti-crack cement mixture comprises the following components in parts by weight: 46-78 parts of cement, 20-32 parts of sand, 18-26 parts of oil shale ash, 5-8 parts of mineral powder, 3-7 parts of anhydrite, 0.6-3.2 parts of fiber and0.5-1.2 parts of an additive. The preparation method of the anti-crack cement mixture comprises the steps of burdening, grinding and mixing. By adjusting the components of the anti-cracking cement mixture, the prepared cement mixture has good anti-cracking performance.

Description

technical field [0001] The invention relates to the technical field of building material production, in particular to an anti-crack cement mixture and a preparation method thereof. Background technique [0002] Cement refers to powdery hydraulic inorganic gelling materials. It can become a slurry after adding water and stirring, and can be hardened in the air or better hardened in water, and can firmly bind sand, stone and other materials together. In the early years the mixture of lime and volcanic ash is very similar to lime pozzolanic cement, use it to glue concrete which made of crushed stone. After hardening, the cement not only has high strength, but also can resist the erosion of fresh water or salt water. [0003] At present, the production process of Portland cement is representative in cement production. Limestone and clay are used as the main raw materials. After crushing, batching, and grinding, raw materials are made into raw materials, and then fed into cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2111/343C04B14/06C04B18/06C04B18/12C04B22/143C04B20/0048C04B2103/50C04B2103/22C04B2103/408
Inventor 尹峰付二全陈卫东张勇姚嘉宝群群郭慧峰贺瑞锋明磊张晓蕾
Owner 内蒙古高速公路集团有限责任公司
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