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A kind of ultra-high strength concrete with low shrinkage and low viscosity

An ultra-high-strength concrete, low-viscosity technology, applied in the field of building materials, can solve the problems of deviating from practical application, difficult concrete technology, insufficient number of powder storage tanks, etc., achieving obvious increase, improved performance and mechanical properties, and good working performance. Effect

Active Publication Date: 2017-08-25
中建商品混凝土(福建)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In large-scale production, the commercial concrete mixing plant will face the dilemma of insufficient powder storage tanks, which makes it difficult for concrete technology to be applied to actual projects on a large scale, and eventually deviates from practical applications.

Method used

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  • A kind of ultra-high strength concrete with low shrinkage and low viscosity

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Experimental program
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Effect test

Embodiment 1

[0020] A low-shrinkage, low-viscosity ultra-high-strength concrete, one cubic meter (m 3 ) Concrete components are as follows: cement 250kg, microbeads 180kg, mineral powder 120kg, machine-made sand 820kg, basalt gravel 985kg, water reducing agent 9.0kg, water 125kg. After the materials are ready, mix the above components and stir them with a forced mixer for 1.5mim to get the low-shrinkage low-viscosity ultra-high-strength concrete described in the present invention. The concrete has good workability, low viscosity, and no segregation or bleeding. Phenomenon. The performance, hardening performance and shrinkage of the concrete mixture are shown in Table 1.

Embodiment 2

[0022] A low-shrinkage, low-viscosity ultra-high-strength concrete, one cubic meter (m 3 ) Concrete components are as follows: cement 280kg, microbeads 150kg, mineral powder 110kg, machine-made sand 840kg, basalt gravel 1000kg, water reducing agent 8.7kg, water 120kg. After the materials are fully prepared, mix the above components and stir them with a forced mixer for 1.5 minutes to obtain the low-shrinkage, low-viscosity, ultra-high-strength concrete described in the present invention. The concrete has good workability, low viscosity, and no segregation or bleeding. Phenomenon. The performance, hardening performance and shrinkage of the concrete mixture are shown in Table 1.

Embodiment 3

[0024] A low-shrinkage, low-viscosity ultra-high-strength concrete, one cubic meter (m 3 ) Concrete components are as follows: cement 300kg, microbeads 120kg, mineral powder 120kg, machine-made sand 860kg, limestone gravel 970kg, water reducing agent 10.2kg, water 120kg. After the materials are fully prepared, mix the above components and stir them with a forced mixer for 2.0 minutes to obtain the low-shrinkage, low-viscosity, ultra-high-strength concrete described in the present invention. The concrete has good workability, low viscosity, and no segregation or bleeding. Phenomenon. The performance, hardening performance and shrinkage of the concrete mixture are shown in Table 1.

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Abstract

The invention belongs to the technical field of building materials, and specifically relates to a low-shrinkage, low-viscosity ultra-high-strength concrete. The concrete is calculated according to the dosage of a single formula, and the ingredients and dosage are as follows: 250-300kg of cement, 120-180kg of microbeads, and 90-100kg of mineral powder. 120kg, machine-made sand 820-860kg; crushed stone 950-1000kg, water reducing agent 7-11kg; water 115-125kg, stirring for 1.5-2min to obtain a concrete mixture. The concrete cementitious material of the present invention uses less, the total shrinkage rate is low (0.3-0.4‰), the emptying time of the inverted slump cylinder is 5-10s, and the viscosity of the mortar with the same proportion is 20-28Pa·s, 28d The compressive strength is 110MPa~130MPa, and the 56d compressive strength is 120MPa‑135MPa. The concrete has the characteristics of low amount of cementitious material, short mixing time, good work performance and low comprehensive cost, can realize large-scale production, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-shrinkage, low-viscosity ultra-high-strength concrete. Background technique [0002] Due to its high strength, high corrosion resistance and durability, high-strength high-performance concrete can reduce the size of the structure, reduce the weight of the structure, save land, reduce energy consumption, reduce structural maintenance costs and reconstruction costs, etc., and its technical development has become the focus of the construction industry. One of the concrete technologies studied and paid attention to. At the same time, with the development trend of high-rise and super-high-rise, long-span, underground and harsh environments in architectural design, high-strength and ultra-high-strength high-performance concrete has a prominent role in large-scale projects such as super high-rise buildings, cross-sea bridges, and offshore oil production plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/30
CPCY02W30/91
Inventor 张恒春季锡贤邹开波刘士红刘中心林熙殷新博赵柳张昌稳郑小青
Owner 中建商品混凝土(福建)有限公司
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