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A kind of high anti-crack lightweight high-strength self-compacting concrete and its preparation method

A self-compacting concrete, high crack resistance technology, applied in the field of concrete materials, can solve the problems of inability to use prefabricated components, light aggregate concrete bulk density, hoisting and transportation machinery can not meet the requirements, etc., to suppress the risk of cracking and reduce bulk density. , the effect of reducing dependence

Active Publication Date: 2022-06-28
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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  • A kind of high anti-crack lightweight high-strength self-compacting concrete and its preparation method
  • A kind of high anti-crack lightweight high-strength self-compacting concrete and its preparation method
  • A kind of high anti-crack lightweight high-strength self-compacting concrete and its preparation method

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Experimental program
Comparison scheme
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 a high-crack-resistant lightweight high-strength self-compacting concrete and a preparation method thereof, belonging to the technical field of concrete materials. The high-crack-resistant lightweight high-strength self-compacting concrete provided by the present invention, in addition to cement, water, light sand, river sand, light aggregate, composite admixtures and functional admixtures used in conventional concrete, adds microbeads, shrinkage-reducing Shale pottery sand is used for light sand, red mud ceramsite is used for light aggregate, and the weight ratio of shale pottery sand and river sand is 10:9 for mixing. The composite admixture is composed of slag powder, powder A mixture of coal ash and silica fume. Compared with the concrete of the same strength grade, the bulk density of the concrete provided by the invention is reduced by 40% to 50%, and the drying shrinkage value is only about 80% of the concrete of 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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Patent Type & Authority Patents(China)
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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