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Low-viscosity easy-to-pump ultrahigh-strength concrete with average strength of 120MPa

A technology of ultra-high-strength concrete and average strength, which is applied in the field of building materials and can solve the problems of difficult pumping, high viscosity, and inability to use ultra-high-strength concrete for pumping.

Active Publication Date: 2014-03-05
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high strength, high viscosity and difficult pumping of ultra-high-strength concrete in the prior art, especially the worldwide problem that cannot be applied to the pumping of ultra-high-strength concrete in super high-rise buildings

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  • Low-viscosity easy-to-pump ultrahigh-strength concrete with average strength of 120MPa

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Embodiment Construction

[0026] Below we will further elaborate on the low-viscosity, easy-to-pump concrete with an average strength of 120 MPa in conjunction with specific examples, in order to understand its structural fit and functional characteristics more clearly, but it cannot be used to limit it. protected range.

[0027] The invention is a low-viscosity, easy-to-pump superhigh-strength concrete with an average strength of 120MPa. The concrete includes cement, slag micropowder, microbeads, silica fume, sand, stones, admixtures and water.

[0028] One of the most important components and proportions are as follows:

[0029] Composition unilateral dosage ratio (kg / m 3 )

[0030] Cement 400~440

[0031] Silica fume 40~60

[0032] Slag fine powder 60~80

[0033] Microbeads 100~120

[0034] Natural sand with a fineness modulus of 2.8-3.2 700-750

[0035] Pebbles 980~1000

[0036] Admixture 19.5~22.75

[0037] Mix water 130~135.

[0038] The present invention is used for ultra-high-strength...

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Abstract

The invention relates to low-viscosity easy-to-pump ultrahigh-strength concrete with average strength of 120MPa. The concrete comprises the following components at single-prescription dosage ratio of kg / m<3>: 400-440 parts of cement, 40-60 parts of silica fume, 60-80 parts of slag micro powder, 100-120 parts of microspheres, 700-750 parts of natural sand with fineness modulus of 2.8-3.2, 980-1,000 parts of stone, 19.5-22.75 parts of additive and 130-135 parts of mixing water, wherein the additive is a polycarboxylate-type high-performance water reducing agent Glenium 8008 and has high water reducing rate, strong viscosity reducing property and high slump retaining property; the expansion degree of the ultrahigh-strength concrete is kept at 700+ / -50mm within 4 hours, the back taper time is controlled at 3-8 seconds, the viscosity is kept at 28-35Pa.s, and ultrahigh pumping of 300m and higher is easy to realize. The concrete provided by the invention can meet the performance requirements for ultrahigh concrete pumping of 500m and higher in terms of high slump retaining property, self-compaction property, strength property, low-viscosity property and the like.

Description

technical field [0001] The invention relates to building materials, in particular to a low-viscosity, easy-to-pump ultrahigh-strength concrete with an average strength of 120MPa. Background technique [0002] The ultra-high-strength ultra-high pumpable concrete used in specially designed super high-rise buildings needs to have higher requirements, and the strength, viscosity properties and pumpability of the concrete must meet the corresponding standards. Therefore, the corresponding concrete type must be designed for the specific project. [0003] Under the current technical conditions, the preparation of general concrete cannot meet the strength level requirements of 120MPa ultra-high-strength concrete. Even if a certain strength level concrete is prepared, it cannot meet the pumping performance requirements of 500m and above due to its high viscosity. It is precisely because of the possible construction development needs of super high-rise buildings in the future that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 吴德龙龚剑陈建大花力吴慧华朱毅敏田颖钱黄玉林
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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