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Self-compact concrete with oversized-particle aggregate and construction technology thereof

A technology of self-compacting concrete and large particle size, which is applied in the field of super-large particle size aggregate self-compacting concrete and its construction technology, can solve problems such as low construction efficiency, and achieve improved construction efficiency, easy temperature control, and low hydration temperature rise. Effect

Active Publication Date: 2013-11-20
GUIZHOU HIGHWAY ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the construction of traditional rockfill concrete, there are strict regulations on the amount of aggregate mixed, aggregate particle size, aggregate gap, aggregate input method, etc., and the construction efficiency is low.

Method used

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  • Self-compact concrete with oversized-particle aggregate and construction technology thereof
  • Self-compact concrete with oversized-particle aggregate and construction technology thereof
  • Self-compact concrete with oversized-particle aggregate and construction technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0043] Example 1-3: Preparation of superfluid self-compacting concrete with different fly ash content

[0044] Table 1 Proportion of superfluid self-compacting concrete (by weight, the same below)

[0045]

[0046]

[0047] The properties of the prepared superfluid self-compacting concrete are shown in Table 2:

[0048] Table 2 Properties of superfluid self-compacting concrete with different amounts of fly ash

[0049]

[0050] It shows that the change of large amount of fly ash has a significant effect on the workability of concrete, and also has a great effect on the early strength of concrete, but has little effect on the 28d strength. Choosing an appropriate amount of fly ash has a positive effect on the workability and strength of superfluid self-compacting concrete, and facilitates the construction of self-compacting concrete with ultra-large particle size aggregates.

Embodiment 4-6

[0051] Example 4-6: Preparation of superfluid self-compacting mortars with different water-binder ratios

[0052] The cement is Portland cement with a strength grade of 42.5 produced by Guizhou Cement Factory;

[0053] The fly ash is the first-class fly ash produced by Guizhou Power Plant;

[0054] The superfluid special admixture is selected from the superfluid self-compacting concrete admixture (composed of polycarboxylate superplasticizer, sodium gluconate, cellulose ether and sodium dodecylbenzenesulfonate in a mass ratio of 75:4.5: 20:0.5 composite, the polycarboxylate superplasticizer has a solid content of 29wt%);

[0055] The sand is selected from river sand with a particle size not greater than 5mm.

[0056] The stones are crushed stones with continuous gradation of 5-10mm, the content of needle-like particles is less than 10wt%, and the porosity is less than 40%.

[0057] Table 3 Proportion of superfluid self-compacting mortar (by weight)

[0058]

[0059]

...

Embodiment 7

[0064] Example 7: Construction method of gravity retaining wall for highway

[0065] The gravity retaining wall maintains the stability of the retaining wall under the earth pressure by the self-weight of the wall. It is the most commonly used form of retaining wall in my country at present. The design strength of the retaining wall in this case is 30MPa.

[0066] Ingredients: large-size aggregates are selected from limestone or marble, the particle size is controlled at 300-1500mm, no weathering, integrity, hard texture, no peeling layer and cracks, no mud layer on the surface, and the content of mud and mud blocks is not more than 0.5 wt%, the saturated water compressive strength is not less than 30MPa, and the batching type selection of preparing superfluid self-compacting concrete is the same as embodiment 1;

[0067] Batching ratio of superfluid self-compacting concrete: (by weight)

[0068]

[0069] Construction methods:

[0070] (1) In addition to using traditiona...

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Abstract

The invention relates to a self-compact concrete with oversized-particle aggregate. The self-compact concrete is prepared by pouring large-particle-size aggregate with particle size of 100mm-1500mm and superfluid self-compact concrete slurry, wherein the superfluid self-compact concrete slurry is prepared by adding water into cement, pulverized coal ash, silica fume, dedicated superfluid additive, sand, stones and other mineral admixtures and mixing. The construction technology comprises the steps of directly placing the oversized-particle aggregate into a construction bin to form large-particle-size aggregate accumulation body with certain natural clearances, then pouring the superfluid self-compact concrete slurry on the surface of the large-particle-size aggregate, filling the clearances of the large-particle-size aggregate by means of self gravity, forming a complete, compact and low-hydration-heat concrete structure together with the large-particle-size aggregate after the superfluid self-compact concrete slurry is hardened, wherein the strength grade of the concrete can meet different design demands. The self-compact concrete with oversized-particle aggregate is not only applicable to mass concrete construction, but also applicable to reinforcing bar system engineering.

Description

technical field [0001] The invention relates to a self-compacting concrete with ultra-large particle size aggregate and its construction technology, which is especially suitable for large-volume concrete construction, such as construction, foundation, water conservancy, hydraulic engineering, tunnel and other projects, and is used to replace the traditional concrete construction technology. Background technique [0002] Self-compacting concrete is a new type of high-performance concrete. The freshly mixed concrete has very good workability, which significantly improves the filling, compactness and uniformity of the concrete. It can fill the formwork by itself without vibrating under its own weight. Space, forming a uniform and dense concrete structure, so it is widely used in concrete projects that are more suitable for large pouring volume, deep pouring depth or high pouring height, dense steel bars, and special shapes. Rock-fill concrete is generally used for foundation en...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/00
Inventor 周大庆蒋正武郑文刘天贵徐贵荣尤诏
Owner GUIZHOU HIGHWAY ENG GRP
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