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Self-compacting active powder concrete and method for making same

A technology of active powder and concrete, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of easy defects in materials and performance degradation of concrete structures, and achieve low fluidity and small loss over time Effect

Inactive Publication Date: 2008-03-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only consumes a lot of manpower and material resources, but also the material is prone to defects, which eventually leads to a serious decline in the performance of concrete structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: see Table 1 for raw materials and specifications, and see Table 2 for material proportions and properties.

[0025] Table 1

[0026] Material

Specification or grade

source

cement

PO 42.5 ordinary Portland cement

Shanghai Seal Cement Group

Silica fume

EM920U

Elkem International Trading Shanghai Co., Ltd.

Quartz powder

320 mesh

Anhui Fengyang Fengcheng Powder Material Co., Ltd.

Quartz sand

30~70 mesh

Anhui Fengyang Fengcheng Powder Material Co., Ltd.

Superplasticizer

PC new high-efficiency water reducer for concrete; pH neutral; solid

Content 40%; Viscosity (Tu-4 cups) 40s

Shanghai Aoshen Architectural Chemical Technology Co., Ltd.

[0027] Table 2 uses ordinary Portland cement to prepare self-compacting reactive powder concrete and its comparative examples (parts by mass)

[0028] project

Embodiment 2

[0029] Example 2: Self-compacting active powder concrete prepared with Portland cement. The specifications and manufacturers of the materials used are shown in Table 3, and the material ratio and performance are shown in Table 4.

[0030] table 3

[0031] Material

Specification or grade

source

cement

P II 52.5R

Jiaxin Jingyang Cement

Silica fume

EM920U

Elkem International Trading Shanghai Co., Ltd.

Quartz powder

320 mesh

yellow sand

Pass 0.63mm sieve

Ordinary yellow sand

Superplasticizer

GLENIUM SP-8CN

Shanghai Master Building Materials Co., Ltd.

[0032] Table 4 uses Portland cement to prepare self-compacting reactive powder concrete and its comparative examples

[0033] project

Embodiment 3

[0034] Embodiment 3: see Table 1 for raw material specifications, and see Table 5 for material proportions and properties.

[0035] Table 5 Self-compacting reactive powder concrete prepared using ordinary Portland cement

[0036] project

[0037] From embodiment 1-embodiment 3 as can be seen, according to the proportioning of the present invention and the reactive powder concrete of preparation method preparation, its flow spread (utilize the truncated cone circular mold test of jumping table fluidity, but do not vibrate) surpass 255mm , with self-compacting performance, no need to vibrate when the product is formed. The product is demoulded under normal temperature and humidity conditions for 1 day, then immersed in normal temperature water for 28 days, the compressive strength exceeds 100MPa, and the flexural strength exceeds 15MPa; if it is cured in 90℃ hot water for 3 days, the compressive strength exceeds 150MPa, and the flexural strength exceeds 15MPa. 20MPa;...

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Abstract

The present invention belongs to the building material technology field, in particular to relate to a self-compact active powder concrete and the corresponding preparation method. The self-compact active powder concrete is made of cement, silicon ash, quartz powder, sand, water reducer and water according to the weight ratio. The cement is one of Portland cement or the common silicate; the water reducer is poly carboxylate water reducer. The present invention uses the new type water reducer to make the flow expanding degree for the active powder concrete up to 255mm; and moreover the age losing for the flow degree is much smaller; the flow degree within 2 hours is not changeable basically; so the present invention can enhance the convenience performance for the construction. The compression strength in 28d maintaining reaches up to 100Mpa; the compression strength in 90 DEG C and 3d water maintenance reaches up to 150Mpa. The materials used in the present invention all are the common industrial materials, so the present invention can decrease the manufacturing cost greatly and is convenient to be widely used. The present invention is of simple preparation method and wide application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a self-compacting active powder concrete and a preparation method thereof. Background technique [0002] Reactive Powder Concrete (RPC) is a new type of concrete developed by French scholar Pierre Richard in the 1990s. It is made of well-graded fine sand, cement, quartz powder, silica fume, and superplasticizer. It has high compressive strength and good toughness, so it has great application value and development potential in the engineering field, and has become a hot spot in the field of concrete research. In 1997, the completion of a 60m-long footbridge over the Magog River in Sherbrooke, Canada, completed the leap from theory to practice of RPC. There are a lot of related research work on RPC in foreign countries, and there is also a lot of work in this field in China. [0003] Due to the low water-binder ratio of RPC, it is often more difficult to mi...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/06C04B14/04
CPCC04B28/02C04B28/04Y02W30/91C04B14/06C04B18/146C04B2103/302
Inventor 钟世云
Owner TONGJI UNIV
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