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Ultrahigh-strength concrete and preparation method thereof

An ultra-high-strength concrete technology, applied in the field of building materials, can solve the problems of restricting the application of ultra-high-strength concrete, large shrinkage of ultra-high-strength concrete, and high early cracking probability, so as to improve the packing density, reduce the water-binder ratio, and improve work performance and the effect on the mechanical properties

Active Publication Date: 2013-06-19
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although ultra-high-strength concrete has many advantages, it also has some disadvantages due to its own characteristics; The shrinkage of high-strength concrete is large, which can reach more than ten thousandths, and it mostly occurs in the early age, resulting in a higher probability of early cracking than ordinary concrete; on the other hand, as the compressive strength of concrete continues to increase, its brittleness gradually increase, which to some extent restricts the application of ultra-high-strength concrete in engineering

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  • Ultrahigh-strength concrete and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] An ultra-high-strength concrete, which comprises the following components in parts by weight: 300 parts of P.O 42.5 cement, 270 parts of composite mineral admixture, 30 parts of composite expansion agent, 96 parts of water, 720 parts of river sand, 1080 parts of 5~20mm limestone gravel, 13.2 parts of polycarboxylate superplasticizer, 4.4 parts of plastic retaining agent, and 0.18 parts of defoamer; the composite mineral admixture consists of 42 parts of S95 mineral powder, 150 parts of fly ash parts, 30 parts of silica fume, 18 parts of zeolite powder, and 30 parts of wollastonite powder; the composite expansion agent is composed of 18 parts of light-burned magnesium oxide and 12 parts of calcium oxide.

[0031] The preparation method of above-mentioned ultra-high strength concrete, it comprises the following steps:

[0032] (1) First use cement mortar with the same water-binder ratio as ultra-high-strength concrete (calculated according to 96 parts of water in the raw ...

Embodiment 3

[0041] An ultra-high-strength concrete, which comprises the following components in parts by weight: 350 parts of P.O 42.5 cement, 315 parts of composite mineral admixture, 35 parts of composite expansion agent, 104 parts of water, and 700 parts of medium-coarse river sand 1042 parts of 5~20mm limestone gravel, 13.7 parts of polycarboxylate superplasticizer, 4.5 parts of plastic retaining agent, and 0.2 parts of defoamer; the composite mineral admixture consists of 45.5 parts of S95 mineral powder, pulverized coal 175 parts of ash, 32.5 parts of silica fume, 21 parts of zeolite powder, and 35 parts of wollastonite powder; the composite expansion agent is composed of 21 parts of light-burned magnesium oxide and 14 parts of calcium oxide.

[0042] After taking the material, the process described in Example 1 can be used to produce ultra-high strength concrete with a compressive strength of 162.5 MPa at 60 days, a splitting tensile strength of 10.2 MPa at 60 days, and an autogenou...

Embodiment 4

[0044] A kind of ultra-high-strength concrete, which comprises the following raw materials in parts by weight: 320 parts of cement, 315 parts of composite mineral admixture, 35 parts of composite expansion agent, 112 parts of water, 680 parts of river sand, 1012 parts of gravel, 14.0 parts of polycarboxylic acid superplasticizer, 4.7 parts of plastic retaining agent, and 0.21 part of defoamer; the composite mineral admixture consists of 49 parts of mineral powder, 175 parts of fly ash, 35 parts of silica fume, and 21 parts of zeolite powder 35 parts of wollastonite powder; the composite expansion agent is composed of 21 parts of light-burned magnesium oxide and 14 parts of calcium oxide.

[0045] The cement is ordinary Portland cement with a strength grade greater than or equal to 42.5, and its Burger specific surface is greater than or equal to 350m 2 / kg;

[0046] The mineral powder is S95, and its Burger specific surface area is greater than or equal to 400m 2 / kg; the Bu...

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Abstract

The invention discloses ultrahigh-strength concrete which comprises the following components in parts by weight: 300-350 parts of cement, 270-315 parts of composite mineral admixture, 30-35 parts of composite expanding agent, 96-112 parts of water, 680-720 parts of river sand, 1012-1080 parts of gravel, 13.2-14.0 parts of polycarboxylic acid high-efficiency water reducing agent, 4.4-4.7 parts of plastic retaining agent and 0.18-0.21 part of defoaming agent, wherein the composite mineral admixture is prepared from 42-49 parts of ore powder, 150-175 parts of fly ash, 30-35 parts of silica fume, 18-21 parts of zeolite powder and 30-35 parts of wollastonite powder. The invention is characterized in that the 60d concrete compression strength is 140-160 MPa, the 60d splitting tensile strength is 9.2-10.2 MPa, extruded concrete can achieve self-compaction effect within 3 hours, and the 14d self-shrinkage value is less than 0.05%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ultra-high-strength concrete and a preparation method thereof. Background technique [0002] In recent years, high strengthening has become one of the trends in the development of modern concrete technology. The research and development of high-strength concrete has made great progress. The strength of high-strength concrete has gradually increased, its performance has been continuously improved, and it has been widely used in many fields. However, with the complexity of building structures and the increasing number of super high-rise buildings, high-strength concrete can no longer meet the needs of construction, and ultra-high-strength concrete will become the most important trend in the development of concrete. All countries in the world have begun to conduct theoretical research and engineering applications on ultra-high-strength concrete. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 程宝军黄波杨文邓宵刘小琴刘通贾丽莉
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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