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High-performance hydraulic structure concrete and method for producing the same

A hydraulic structure and concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the volume stability of dam concrete cracking, and the crack resistance of dam concrete is difficult to have a major breakthrough and other problems, to achieve the effect of suitable strength and strength development, high workability and high crack resistance

Inactive Publication Date: 2008-05-07
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD +2
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Problems solved by technology

However, due to the limitation of the performance of traditional cement concrete materials, the volume stability of mass concrete almost without exception leads to the cracking of dam concrete. big breakthrough

Method used

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  • High-performance hydraulic structure concrete and method for producing the same
  • High-performance hydraulic structure concrete and method for producing the same
  • High-performance hydraulic structure concrete and method for producing the same

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Embodiment approach

[0028] Raw materials: cement with strength not less than 42.5MPa, national standard II grade fly ash, natural sand or artificial sand with fineness in the range of medium sand, stone with particle size in the range of 5 to 150 mm, polycarboxylic acid series high-performance water reducing The agent and water are measured separately according to the mixing ratio in the table below.

[0029]

[0030] Preparation method: first put the stones into the mixer, then put the cement and the national standard II grade fly ash into the mixer, then put the sand into the mixer, and finally add the polycarboxylic acid-based high-performance water reducing agent and water into the forced concrete mixer and mix 120 Seconds, the apparent density is 2500kg / m 3 One cubic meter of high-performance hydraulic structural concrete. The fourth grade is C30 concrete with an age of 90 days, the third grade is C25 concrete with an age of 28 days, and the second grade is C25 concrete with an age of 28 days....

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Abstract

The invention relates to a high-performance concrete of hydraulic structure. The invention consists of gelled material, aggregate, water and admixture, wherein, the dosage of the gelled material is 150 to 350 kg / m3 concrete, the admixture is efficient water reducing agent of the polyocarboxy acid series with a dosage of 0.5 to 4.5 percent of the total dosage of the gelled material. The ratio of the water and glue is 0.30 to 0.50. The invention has the steps as follows: adding the aggregate (sand and stone), the gelled material (concrete and fly ash), the water reducing agent and the water in a mixing machine, then stirring for 90 to 120 seconds so as to produce the high-performance concrete with hydro structure and surface density of 2400 to 2600 kg / m3. The high-performance concrete with hydro structure adopting the prescription and the method of the invention is characterized by much lower hydrous exotherm, higher cubage stability, much higher cracking resisting ability, high seeping resisting capacity, freezing resisting capacity, eroding resisting capacity and carbonization resisting capacity so as to satisfy the wearing capacity. Having high dosage of fly ash, the invention satisfies the requirement of sustainable development of the concrete technique.

Description

Technical field [0001] The invention relates to concrete and a preparation method thereof, in particular to a high-performance concrete used in hydraulic structure engineering and a preparation method thereof. Background technique [0002] Concrete used for hydraulic structure engineering, including dam concrete, plant concrete, water diversion system concrete, drainage system concrete, anti-scouring and wear-resistant concrete and other hydraulic structures, has four basic requirements for concrete materials. First, it must meet The design strength level requirements, secondly, must meet the construction requirements, thirdly, must meet the durability requirements, and finally must meet the economic requirements. The survey results of the concrete dams that have been built and put into operation found that the deterioration of the concrete dams earlier than the expected service life is almost all due to the inability of their durability to meet the requirements. For large-volume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/24C04B18/08
CPCC04B2111/00275C04B2201/20C04B2111/22C04B2111/2038C04B2111/343C04B28/02Y02W30/91C04B14/02C04B18/08C04B20/0096
Inventor 潘继录许朝政湛正刚何金荣梁文泉曾正宾杨金娣苏耘
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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