Self-compacting concrete with ultra-large particle size aggregate and its construction technology

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 the problems of low construction efficiency, and achieve the goal of improving construction efficiency, good economic benefits, and excellent volume stability Effect

Active Publication Date: 2015-09-23
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-compacting concrete with ultra-large particle size aggregate and its construction technology
  • Self-compacting concrete with ultra-large particle size aggregate and its construction technology
  • Self-compacting concrete with ultra-large particle size aggregate and its construction technology

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 contents of fly ash

[0049]

[0050] The results show that the change of fly ash content with large content has obvious influence on the workability of concrete, and also has a great influence on the early strength of concrete, and has little influence on the 28d strength. Selecting an appropriate amount of fly ash has a positive effect on the workability and strength of super-fluid self-compacting concrete, which is convenient for the construction of super-large-size aggregate self-compacting concrete.

Embodiment 4-6

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

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

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

[0054] The super-fluid special admixture is selected as the super-fluid self-compacting concrete admixture (made of polycarboxylate superplasticizer, sodium gluconate, cellulose ether and sodium dodecyl benzene sulfonate in a mass ratio of 75:4.5: 20:0.5 composite, the solid content of polycarboxylate superplasticizer is 29wt%);

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

[0056] The gravel with a continuous gradation of 5-10mm is selected for the stone, 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 Highway Gravity Retaining Wall

[0065] Gravity retaining wall maintains the stability of retaining wall under the action of earth pressure by its own weight. It is the most commonly used form of retaining wall in my country. The design strength of the retaining wall in this case is 30MPa.

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

[0067] Super fluid self-compacting concrete batching ratio: (by weight)

[0068]

[0069] Construction methods:

[0070] (1) In addition to using traditional formwork, mason...

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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 super-large particle size aggregate and its construction technology, which is especially suitable for the construction of large-volume concrete, 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. Because of its very good workability, self-compacting concrete can significantly improve the filling, compactness and uniformity of concrete. It can fill the formwork by itself without vibration under its own weight. Therefore, it is widely used in concrete projects with large pouring volume, deep pouring depth or high pouring height, dense reinforcement, and special shapes. Rockfill concrete is generally used for foundation engineering and retaining wall engineering, such as rockfill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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