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Preparation method of early-age high-moisture concrete

A concrete and early-age technology, which is applied in the field of preparation of high-moisture-retaining concrete at an early age, can solve the problems of reduced strength, high cost, poor compatibility, etc., and achieves improved frost resistance, less residue, and improved early crack resistance. sexual effect

Active Publication Date: 2015-09-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

However, it has problems such as high cost, reduced strength, and poor compatibility with

Method used

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  • Preparation method of early-age high-moisture concrete

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Effect test

Embodiment 1

[0028] (1) An early-age high moisture-retaining concrete, its components and dosage per cubic meter of concrete are as follows: 175kg of cement, 40kg of fly ash, 110kg of mineral powder, 848kg of river sand, 1010kg of gravel, 20kg of gel solution, Water agent 4.88kg, expansion agent 28kg, water 152kg.

[0029] (2) Mix the polymer gel and water at a ratio of 1:14, stir with a blade with a shearing device for 5 minutes, and then saturate and absorb water for 48 hours to obtain a gel solution.

[0030] (3) Add gravel and river sand to the mixer according to the raw material ratio in step (1), and dry mix for 15 seconds; then add cement, mineral powder, fly ash, and expansion agent into the mixer, and continue to dry mix for 15 seconds; then add the reduced The water agent, water and the gel solution obtained in step (2) are added to the mixer, and wet mixed for 5 minutes to obtain the mixture; the mixture is poured, vibrated, and cured, and the high-moisture concrete is obtained ...

Embodiment 2

[0042] (1) An early-age high-humidity concrete, its components and dosage per cubic meter of concrete are as follows: 230kg of cement, 60kg of fly ash, 60kg of mineral powder, 785kg of river sand, 1055kg of gravel, gel Liquid 20 kg, water reducer 7.5 kg, expansion agent 30 kg, water 175 kg.

[0043] (2) Mix the polymer gel and water at a ratio of 1:14, stir with a blade with a shearing device for 3 minutes, and then saturate and absorb water for 48 hours to obtain a gel solution.

[0044] (3) Add gravel and river sand to the mixer according to the raw material ratio in step (1), and dry mix for 15 seconds; then add cement, mineral powder, fly ash, and expansion agent into the mixer, and continue to dry mix for 15 seconds; The glue and water are added to the mixer, and wet mixed for 5 minutes to obtain the mixture; the mixture is poured, vibrated, and cured, and the high-moisture concrete can be obtained after 7 days.

[0045] Described cement is P.O42.5 cement.

[0046] The ...

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Abstract

The invention discloses a preparation method of early-age high-moisture concrete. The concrete is prepared from nine raw materials of cement, fly ash, fine ore, a gel liquid, water, a water reducing agent, a swelling agent, river sand and gravel. The concrete is prepared through the steps of mixing, casting and curing. The added gel liquid has the properties of high water absorption, high water retention and controllable water release. The gel liquid has a high water absorption capacity. With the gel solution, most of absorbed water can be kept during a concrete mixing process. During the curing process, when concrete internal relative humidity drops, the absorbed water can be releases gradually. With the internal curing effect formed by water releasing, the time when the internal relative humidity of the core part in the concrete begins to drop can be delayed by 2-3 days than that of traditional concretes. Within 7 days, the internal relative humidity can be maintained higher than 90%. Therefore, high-strength high-performance concrete early-stage shrinkage cracking can be well inhibited. The high-moisture concrete provided by the invention has excellent crack resistance and freezing resistance, and can be widely applied in hard-to-cure concrete structures or members, and concrete structures in strong-wind and high-evaporation regions.

Description

technical field [0001] The invention relates to a preparation method of early-age high moisture-retaining concrete, which belongs to the technical field of building materials. Background technique [0002] High-performance concrete is a modern concrete proposed by some developed countries based on the durability design of concrete structures in the 1980s and 1990s. It takes structural durability as the primary design goal, and has high strength, good construction performance, and high Durability and many other advantages. [0003] In order to obtain higher strength, denser structure and better working performance, high-performance concrete has the following characteristics in terms of materials: the amount of cementitious materials is relatively high, a large number of mineral admixtures (fly ash, slag or silica fume) are used and high-efficiency Water reducing agent. Powers, a famous American scholar, pointed out that the theoretical water-cement ratio of Portland cement ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 刘荣进陈平周睿哲韦家崭赵艳荣冯昌恒陈俊
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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