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High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof

A technology of self-compacting concrete and high crack resistance, applied in the field of concrete materials, can solve the problems that cannot be produced with prefabricated components, the volume of lightweight aggregate concrete is large, and the hoisting and transportation machinery cannot meet the requirements, so as to suppress the risk of cracking and reduce the bulk density , the effect of reducing dependence

Active Publication Date: 2021-06-15
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 1. The bulk density of lightweight aggregate concrete is still too large. At present, traditional hoisting and transportation machinery still cannot meet the requirements and cannot be used for the production of prefabricated components, especially the latest integral exterior wall panels and integral pipe galleries.

Method used

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  • High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof
  • High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof
  • High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0067] The amount of the early strength agent is 0.2% to 0.3% of the total amount of the cementitious material, the amount of the air-entraining agent is 0.25% to 0.35% of the cement amount, and the amount of the polycarboxylate water reducer is the total amount of the cementitious material 1.8% to 2.5% of

[0068] The total amount of the cementitious material is the sum of the amount of cement and mineral admixtures;

[0069] The mineral admixture includes light sand, river sand, lightweight aggregate and composite admixture.

[0070] In the present invention, the dosage of early-strength agent and water-reducing agent is determined according to the initial setting and final setting time (accelerated-strength agent) and fluidity (water-reducing agent) of concrete. The fluidity and solidification time of the process are well matched, the fluidity is good, and the solidification time is not too long; the dosage of the air-entraining agent in the present invention is 10-15 time...

Embodiment 1

[0089] According to a specific embodiment of the present invention, the detailed content of the present invention will be specifically introduced below. This embodiment provides a high-crack-resistant, light-weight, high-strength self-compacting concrete with a design strength grade of C60.

[0090] The invention provides a high-crack-resistant lightweight high-strength self-compacting concrete, which includes components such as cement, water, light sand, river sand, lightweight aggregate, composite admixtures and functional admixtures, and also includes components such as microbeads, Shrinkage reducer and polypropylene fiber;

[0091] Each described component is proportioned according to the following parts by weight:

[0092] 330 parts of cement; 125 parts of water; 200 parts of light sand; 180 parts of river sand; 490 parts of light aggregate; 125 parts of composite admixture; 9.8 parts of functional admixture; Fiber 1.8 parts.

[0093] The light sand is shale pottery san...

Embodiment 2

[0112] According to a specific embodiment of the present invention, the detailed content of the present invention will be specifically introduced below. This embodiment provides a high-crack-resistant, light-weight, high-strength self-compacting concrete with a design strength grade of C70.

[0113] The invention provides a high-crack-resistant lightweight high-strength self-compacting concrete, which includes components such as cement, water, light sand, river sand, lightweight aggregate, composite admixtures and functional admixtures, and also includes components such as microbeads, Shrinkage reducer and polypropylene fiber;

[0114] Each described component is proportioned according to the following parts by weight:

[0115] 340 parts of cement; 120 parts of water; 210 parts of light sand; 190 parts of river sand; 500 parts of light aggregate; 130 parts of composite admixture; 10.2 parts of functional admixture; Fiber 1.8 parts.

[0116] The light sand is shale pottery sa...

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Abstract

The invention provides high-crack-resistance light-weight high-strength self-compacting concrete and a preparation method thereof, belonging to the technical field of concrete materials. According to the high-crack-resistance light-weight high-strength self-compacting concrete provided by the invention, besides cement, water, light sand, river sand, lightweight aggregate, a composite admixture and a functional additive used in conventional concrete, microbeads, a shrinkage reducing agent and polypropylene fibers are added, shale pottery sand is adopted as the light sand, red mud ceramsite is adopted as the lightweight aggregate, the shale pottery sand and the river sand are mixed according to a weight ratio of 10: 9, and the composite admixture is formed by mixing slag powder, fly ash and silica fume. The volume weight of the concrete provided by the invention is reduced by 40-50% compared with the volume weight of concrete with the same strength grade, and the drying shrinkage value of the concrete is only about 80% of the drying shrinkage value of concrete with the same strength grade.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a high-crack-resistant lightweight high-strength self-compacting concrete and a preparation method thereof. Background technique [0002] Usually, the bulk density is less than 1500kg / m 3 Concrete with a strength grade of C60-C80 is called lightweight high-strength concrete. [0003] At present, with the rise of new building structures and components such as prefabricated buildings and long-span structures, the lightweight of prefabricated structures has become an inevitable requirement for industrialized building installation and rapid construction. Realizing the self-compacting of concrete effectively avoids unsightly construction sites. Concrete segregation due to regular vibration. With the rapid development of construction industrialization and the world's requirements for building energy conservation, light weight and self-compacting have become an inevitable t...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/08C04B38/00C04B111/40C04B111/34C04B111/20C04B18/02C04B16/06C04B18/14C04B18/08
CPCC04B28/04C04B2111/40C04B2111/343C04B2111/29C04B2201/52C04B2201/50C04B2201/20C04B14/068C04B18/027C04B18/141C04B18/08C04B18/146C04B2103/12C04B2103/302C04B2103/304C04B16/0633C04B18/082C04B2103/0068C04B38/00Y02W30/91
Inventor 曹擎宇崔守臣郝挺宇钱元弟邵彦超宋家茂关键
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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