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High-strength and anti-cracking mass concrete

A large-volume concrete and concrete technology, which is applied in the field of concrete engineering, can solve problems such as cumbersome operation processes, and achieve the effects of prolonging the setting time, reducing heat generation, and improving strength

Active Publication Date: 2021-06-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all use external technology to improve the cracking problem of mass concrete, which is relatively cumbersome in the actual operation process

Method used

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  • High-strength and anti-cracking mass concrete
  • High-strength and anti-cracking mass concrete
  • High-strength and anti-cracking mass concrete

Examples

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Embodiment

[0039] A high-strength, crack-resistant mass concrete, calculated as 1 cubic meter of concrete, the components are as follows:

[0040] Low heat portland cement 280-420kg;

[0041] Modified mineral admixture 90-260kg;

[0042] Medium sand 700-900kg;

[0043] 5-25mm continuous graded gravel 900-1200kg;

[0044] Water 150-220kg;

[0045] Functional composite admixture 5-10kg.

[0046] Further, in parts by mass, the modified mineral admixture contains 30-70 parts of slag, 25-55 parts of coal cinder, 0-35 parts of desulfurization ash, and the total mass of the three is 100 parts, and then 0.2- 0.5% sodium gluconate and 0.1-0.2% polyalcohol amine are prepared through mechanical grinding until the sieve residue of 80 μm does not exceed 10%.

[0047] Further, in terms of parts by mass, the functional composite admixture consists of 18-42 parts of low hydration heat retarding water reducer, 18-42 parts of water-retaining internal maintenance anti-cracking type water reducer, 10-3...

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Abstract

The invention discloses high-strength and anti-cracking mass concrete, which comprises the following components on the basis of 1 cubic meter of concrete: 280-420 kg of low-heat Portland cement; 90-260 kg of a modified mineral admixture; 700-900 kg of medium sand; 900-1200 kg of continuous graded broken stone with a particle size of 5-25 mm; 150-220 kg of water; and 5-10 kg of a functional composite additive. By optimizing the composition and proportion of the raw materials and regulating and controlling the functional compound admixture, the prepared mass concrete is good in workability, high in strength, slow in hydration and low in hydration heat, and the problem that cracks are generated due to the fact that the temperature difference between the interior and the exterior of the concrete is large can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of concrete engineering, and more specifically relates to a high-strength, crack-resistant mass concrete. Background technique [0002] my country's "Code for Construction of Mass Concrete" GB50496-2009 stipulates that the minimum geometric size of the concrete structure is not less than 1m, or it is expected to cause harmful cracks due to temperature changes and shrinkage caused by the hydration of the cementitious material in the concrete. The resulting concrete is called mass concrete. [0003] Mass concrete was first used in hydraulic engineering, and it is widely used. In recent years, with the development of social economy and construction technology, the scale of buildings has continued to expand, and there are more and more high-rise buildings and super high-rise buildings. Mass concrete has gradually become an important part of building large facilities or super high-rise buildings. However, compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/343C04B2201/50C04B18/103C04B18/141C04B18/062C04B14/06C04B14/04C04B24/10C04B24/02C04B24/122C04B24/166C04B22/10C04B22/062Y02W30/91
Inventor 李相国蒋文广吕阳蹇守卫柯凯刘卓霖
Owner WUHAN UNIV OF TECH
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