Premixed and pumped heavy concrete

A technology of concrete and concrete admixture, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as cracking of large-volume concrete, to avoid cracking, improve compactness, strength and durability, The effect of ensuring homogeneity

Inactive Publication Date: 2010-03-24
HUNAN NO 6 ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problems to be solved by the present invention are: the gradation problem of heavy aggregates, the prevention of stratification, segregation, and bleeding of the mixture, the reduction of slump loss, the pumping problem, and the excessive heat of hydration of cement causing large Bulk concrete cracking problem

Method used

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  • Premixed and pumped heavy concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Selected materials: thick and fine aggregates are all of the same type of barite ore, processed through washing, crushing and screening, and the apparent density of the ore is 4360kg / m 3 , mud content <1%, coarse aggregate size 5-20mm, crushing index 28%, fineness modulus of fine aggregate is 2.58.

[0026] Cement materials use high-efficiency concrete admixtures produced by Xiangtan Changqing Building Materials Co., Ltd.

[0027] The functional modulators are selected from hydroxypropyl methylcellulose and high-viscosity starch sodium.

[0028] Concrete admixtures are selected from polycarboxylate water reducers, polyol derivatives, hydroxycarboxylates and sulfates.

[0029] Heavy concrete mix ratio:

[0030] Material

[0031] Concrete performance:

[0032] performance

[0033] The heavy concrete mixture has good cohesiveness, plastic retention, no stratification and segregation phenomenon, is stable and does not block the pump during pumping, a...

Embodiment 2

[0035] Thick and fine aggregates, variety and quality are the same as the above example.

[0036] Cement materials use ordinary cement 42.5 and S105 slag powder.

[0037] Carboxymethyl cellulose and polyvinyl alcohol are selected as functional regulators.

[0038] Concrete admixtures are selected from naphthalene-based water reducers, polyol derivatives, sodium polyphosphate and sulfates.

[0039] Heavy concrete mix ratio:

[0040] Material

[0041] Concrete performance:

[0042] performance

[0043] The heavy concrete mixture has good cohesiveness, plastic retention, no stratification and segregation phenomenon, is stable and does not block the pump during pumping, and is easy to vibrate for construction. The amount of mixing and transportation per production is 40% less than usual. The concrete is suitable for large-volume radiation-proof heavy concrete projects with a thickness less than 1500mm.

Embodiment 3

[0045] Use scrap iron and barite as coarse aggregate, and iron sand and barite sand as fine aggregate. Scrap iron and iron sand need to be degreased and cleaned. The size of scrap iron is 5-35mm, and the iron sand is less than 5mm. Stone coarse and fine aggregates meet the aforementioned technical requirements.

[0046] The cement materials are high-efficiency concrete admixtures produced by Xiangtan Changqing Building Materials Co., Ltd.

[0047]The functional modifier is selected from hydroxyethyl cellulose.

[0048] Concrete admixtures are selected from naphthalene-based water reducers, polyol derivatives, sodium polyphosphate and sulfates.

[0049] Heavy concrete mix ratio:

[0050] Material

[0051] Concrete performance:

[0052] performance

[0053] The heavy concrete mixture has good cohesiveness, plastic retention, no stratification and segregation phenomenon, is stable and does not block the pump during pumping, and is easy to vibrate for const...

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Abstract

The invention relates to a premixed and pumped heavy concrete which comprises 80-93 parts by weight of heavy aggregate, 6-15 parts by weight of cement materials, 2-5 parts by weight of water, less than 0.4 part by weight of concrete additive and less than 0.01 part by weight of function regulator. The apparent density of the concrete is more than 3500kg/m<3>, the mixture has no phenomena of lamination and segregation, and the concrete has good cohesion and plasticity protection, thereby being applicable to long-distance pumping. The concrete selects a high-performance concrete admixture and can avoid the occurrence of cracks of the large-volume concrete caused by hydration heat of cement. The concrete is applicable to an anti-radiation heavy concrete engineering with the thickness of morethan 1500mm. The concrete can be widely used in shielding places of nuclear reactors, medical particle accelerators, customs inspection, scientific research laboratories and other applications of therelated nuclear industry and the radioactive isotope technology.

Description

technical field [0001] The invention belongs to the field of special concrete for building materials, and specifically refers to a pre-mixed and pumpable anti-radiation heavy concrete. Background technique [0002] Due to the rapid development of the nuclear industry and related radioactive industries, radioisotope technology has been widely used in the fields of industry, agriculture, medical treatment, national defense, customs, scientific research laboratories, etc., and people's contact with places with radioactive radiation is becoming more and more common. And all kinds of radiation have great and far-reaching effects on human body and environment. In order to ensure the physical and mental health, safety and environment of professionals and non-professionals, the protection of related equipment and facilities is extremely important. [0003] Radioactive rays include α-rays, β-rays, γ-rays, x-rays, neutron rays and proton fluxes. Its penetrating ability and its impac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/12
CPCC04B2111/00862C04B2111/20C04B2201/20C04B2111/343C04B28/02Y02W30/91C04B14/04C04B14/34C04B14/368C04B18/14C04B22/14C04B24/18C04B24/223C04B24/226C04B24/2623C04B24/2641C04B24/2652C04B24/2676C04B24/32C04B24/38C04B24/383C04B2103/302C04B14/02C04B22/0093C04B22/085C04B22/10C04B22/12C04B22/142C04B24/06C04B24/10C04B24/243
Inventor 张卫党贺海山王国光陈鸿钧伍灿良方东升廖宏
Owner HUNAN NO 6 ENG CO LTD
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