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High fly ash commercial concrete or ready-mixed concrete

A technology for commercial concrete and ready-mixed concrete, applied in the field of commercial concrete or pre-mixed concrete, can solve the problems affecting the durability of concrete structures, large fluctuations in concrete quality, cracking of concrete structures, etc. Satisfaction, low hydration temperature rise effect

Inactive Publication Date: 2009-09-09
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the current research results on the production quality of commercial concrete, it is found that the level of understanding of modern concrete technology is generally low, the quality of concrete fluctuates greatly, the amount of cement is too much, and the water-binder ratio is too high, which are the main problems.
On the other hand, cracking phenomenon abounds in concrete structures, seriously affecting the durability of concrete structures

Method used

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  • High fly ash commercial concrete or ready-mixed concrete
  • High fly ash commercial concrete or ready-mixed concrete

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Embodiment Construction

[0014] Preferred embodiment of the present invention (compared with ordinary concrete mixed with naphthalene-based high-efficiency water reducer):

[0015] Raw materials: Portland cement or ordinary Portland cement with a strength of not less than 42.5MPa, national standard I or II fly ash, fine sand with a fineness of 1.7-2.2 or intermediate sand with a fineness of 2.3-3.0 (natural sand or artificial sand), gravel with a particle size within the range of 5-31.5mm, polycarboxylate-based high-performance water-reducer and naphthalene-based high-efficiency water-reducer for comparison, and water, according to the mixing ratio listed in Table 1, Measured separately.

[0016] Preparation method: It is required that the metering system of the mixing system, especially the metering system of mixing water and the metering system of chemical admixtures, should have high precision, and the error should be less than 0.03%. Adjust the amount of mixing water; the measurement error of fly...

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Abstract

The invention relates to high fly ash commercial concrete or ready-mixed concrete or a preparation method thereof. The high fly ash commercial concrete or ready-mixed concrete is made from gelled material, aggregate, chemical additive and water; wherein, the gelled material comprises cement and fly ash; the aggregate comprises fine aggregate and coarse aggregate; and the chemical additive is polycarboxylate-based high performance water reducer. The usage of the gelled material is 360-480kg / m<3>concrete; wherein, the concrete is 47%-69wt% of the total gelled material; and the fly ash is 31%-53wt% of the total gelled material. The concrete has good workability, suitable strength and strength development, lower hydration temperature rising, higher volume stabilization, higher cracking resistance, impermeability, frost resistance, corrosion stability, resistance to carbonizing, alkali-resistant-aggregate reaction and chloride-resistant diffusibility.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, in particular to commercial concrete or pre-mixed concrete highly mixed with fly ash. Background technique [0002] Concrete material is an indispensable structural material for all infrastructure construction, and it is also the most widely used and most used man-made material. The reason is that concrete material is a composite material with the most complex structure manufactured by the simplest production process. Modern concrete science and technology is to use certain technical means to maximize the balance between the types and amounts of concrete components and the various properties of concrete, so as to continuously improve the performance of concrete. With the improvement of construction technology and civilized construction level, especially the continuous strengthening of environmental protection awareness, centralized mixing concrete, ready-mixed concrete or read...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B18/08C04B24/26
CPCC04B2111/29C04B2111/26C04B2111/343C04B28/02Y02W30/91C04B14/02C04B18/08C04B20/0096C04B24/2641C04B2103/302
Inventor 梁文泉何真
Owner WUHAN UNIV
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