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High-performance concrete

A high-performance concrete and modification technology, applied in the field of concrete, can solve problems such as increasing the cost of concrete, and achieve the effects of saving raw materials, high water reduction rate, and improving pumpability

Inactive Publication Date: 2017-12-22
GUANGZHOU ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the excessive use of cement and binder, it not only increases the cost of concrete, but also leads to a series of inevitable defects in concrete

Method used

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Examples

Experimental program
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Effect test

Embodiment 1-3

[0045] Table 3 embodiment 1-3 batching list and performance data thereof

[0046]

[0047] Other mechanical properties of concrete of table 4 embodiment 1-3

[0048]

[0049]

[0050] Due to the small amount of cement, no calcium hydroxide crystals can be seen in the 3, 7, and 28d hydration SEM (concrete obtained in Example 1) photos, and a large amount of visible calcium silicate hydrate crystals. As a result, the interfacial properties of concrete are strengthened, and ultra-high performance concrete is formulated.

[0051] Comparative examples 1 and 2 are concretes prepared by using ordinary polycarboxylate water reducer instead of the polycarboxylate water reducer modified by the ether modifier adopted in the present invention.

[0052] Wherein the concrete mix ratio of Comparative Example 1 is the same as the concrete mix ratio of the present invention, but the prepared concrete has poor workability, small slump, cannot be molded, and has large slump loss. Init...

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Abstract

The invention relates to high-performance concrete which is prepared from the following raw materials: 290-305kg / m<3> of cement, 220-270kg / m<3> of mineral powder, 20-30kg / m<3> of silica fume, 104-114kg / m<3> of water, 679-720kg / m<3> of sand, 1070-1135kg / m<3> of stones and 8-9 kg / m<3> of an ether regulator modified polycarboxylate superplasticizer. Compared with the conventional high-strength concrete, the high-performance concrete disclosed by the invention has the advantages that the cement content is reduced from 500kg / m<3> to 209-305kg / m<3>, and the cementing agent content is reduced from 600-750kg / m<3> to 540-570kg / m<3>. The slump of the high-performance concrete is 230-250mm, pump concrete without slump loss is obtained at the temperature of 32 DEG C within 3 hours, and the dumping time is less than 20 seconds.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-performance concrete. Background technique [0002] At present, 52.5PII Portland cement is generally used to prepare high-fluidity high-performance concrete above C100. Due to the low water-binder ratio and low water consumption, the concrete has high cohesion and is easy to harden, making transportation and pumping difficult. On the premise of ensuring the strength and not changing the water-cement ratio, in order to reduce the viscosity and improve the pumpability, it is necessary to increase the water consumption of unilateral coagulation, and at the same time increase the amount of cement and binder. [0003] Existing preparation of concrete above C100, the amount of cement is greater than 600kg / m 3 , for example, the C100 concrete cement dosage of Guangzhou International Finance Center is 500kg / m 3 , Mineral powder 190kg / m 3 , silica fume 60kg / m 3 , the amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/141C04B18/146C04B14/02C04B14/06C04B2103/302
Inventor 万新苏春发颜天佑梁杰陈应钦李古刘锋张丹萍刘文鹏石梅春高小容马莹夏敏莹陈伟标陈端铭
Owner GUANGZHOU ELECTRIC POWER DESIGN INST
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