Machine-made sand self-compacting concrete

A technology for self-compacting concrete and machine-made sand, applied in the field of concrete, can solve the problems of fresh concrete cohesion, poor water retention, reduced workability and fluidity, poor particle gradation of machine-made sand, etc. The effect of improving workability and high water reduction rate

Inactive Publication Date: 2006-06-28
GUIZHOU HIGHWAY ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, due to the poor particle gradation of the machine-made sand, the particle distribution often shows that there are few in the middle and more at the ends. The particles of the machine-made sand are rough and the content of stone powder is high. Therefore, it is often easy to cause fresh concrete to have poor cohesion, water retention, segregation, and bleeding. Reduced workability and fluidity

Method used

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Embodiment Construction

[0022] Embodiment of the present invention: when making the machine-made sand self-compacting concrete of the present invention, take 100 kilograms of cement, add 60-100 kilograms of fly ash, 5-20 kilograms of silica fume, 1-40 kilograms of ground Slag powder, 1-5 kg ​​of polycarboxylate superplasticizer, 0.001-0.08 kg of tackifier, 0.001-0.1 kg of defoamer, 280-360 kg of machine-made sand and 280-360 kg of gravel after mixing The machine-made sand self-compacting concrete of the present invention can be obtained. Among the raw materials used in this embodiment: the ordinary Portland cement with a strength grade of 42.5 produced by Guizhou Cement Plant is selected for cement; the secondary fly ash produced by Guizhou Power Plant is selected for use as fly ash; the production of silica fume is selected from Guizhou Ferroalloy Plant Silica fume, the specific surface area is 19600cm 2 / g; Slag powder is S95 finely ground slag powder produced by Shanghai Baotian Building Material...

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Abstract

A self-compacting concrete with high affinity, strength and durability is proportionally prepared from cement, powdered coal ash, wollastonite, other mineral additives, polycarboxylic acid type water-reducing agent, viscosity increaser, defoaming agent, mechanically prepared sand and broken stone.

Description

Technical field: [0001] The invention relates to self-compacting concrete used in construction, water conservancy, hydraulic engineering, tunnel and other projects, and belongs to the technical field of concrete. Background technique: [0002] Concrete is the largest building structure material for human beings. With the development of modern engineering structures towards long-span, towering, heavy-duty and harsh environmental conditions, high-strength and high-performance concrete has been widely used in high-rise buildings, bridges, ports, oceans, underground and other projects. 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 suit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/02C04B14/04C04B14/06C04B18/08C04B24/04C04B28/04
CPCC04B2111/00103Y02W30/91
Inventor 张林梅世龙蒋正武孙振平杨志刚钱庆强
Owner GUIZHOU HIGHWAY ENG GRP
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