Concrete containing low-quality coarse aggregate and preparation thereof
A technology of concrete and coarse aggregate, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of poor durability of concrete, and achieve excellent durability, accelerated construction progress, and high early strength Effect
Active Publication Date: 2011-09-14
NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST +1
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Problems solved by technology
Usually low-quality coarse aggregate is used to prepare concrete, which will lead to poor concrete durability
Method used
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Embodiment 2
[0020] Concrete prepared with low-quality coarse aggregate from a certain production area requires design compressive strength grade C30, impermeability W8, 28d carbonation depth ≤ 5mm, and frost resistance F150. Use the existing preparation technology to add 4-6kg / m2 to the low-quality coarse aggregate concrete 3 Naphthalene water reducer and 0.04~0.08kg / m 3 Rosin thermal polymer air-entraining agent, the concrete compressive strength can meet the design requirements, but the durability can not meet (impermeability lower than W6, 28d carbonation depth> 5mm, frost resistance can only reach F100). The invention adds ultra-fine fly ash, polycarboxylate water reducer, sodium lauryl sulfate air-entraining agent, metakaolin material and high water-absorbing resin particles into low-quality coarse aggregate concrete to prepare high-durability concrete. The preparation method is as follows:
[0021] (1) 282~309kg / m 3 Cement, 0~121kg / m 3 Superfine fly ash, 60~80kg / m 3 Put the wat...
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Abstract
The invention relates to a concrete containing low-quality coarse aggregates, which is prepared from water, cement, superfine fly ash, sand, gravel stone, medium stone, and admixture according to certain weight proportion. A method for preparing the concrete comprises the following steps: firstly, putting the water, the cement and the superfine fly ash into a stirring apparatus for stirring; secondly, adding the sand, the gravel stone and the medium stone into the stirring apparatus for stirring; and thirdly, adding the admixture into the mixture and stirring the mixture continuously, fillingthe mixture into a mold, and maintaining the mold to obtain the concrete with high durability. Compared with the concrete containing the low-quality coarse aggregates prepared by the prior method, the concrete prepared by the method has the advantages of better mechanical performance, impermeability, carbonizing resistance, and frost resistance, thus the durability of the concrete is remarkably improved.
Description
technical field [0001] The invention belongs to the technical field of hydraulic building materials, and in particular relates to concrete containing low-quality coarse aggregate and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, the demand for coarse aggregate continues to grow, and the high-quality natural coarse aggregate in nature is continuously mined, and the problem of resource depletion is becoming increasingly prominent. Low-quality coarse aggregate refers to coarse aggregate whose physical and mechanical properties are lower than the requirements of relevant specifications and generally cannot be used in engineering. my country's "Code for Construction of Hydraulic Concrete" (DL / T5144-2001) requires the quality of coarse aggregate: mud content (D 20 、D 40 Grade) ≤ 1%, apparent density ≥ 2550kg / m 3 , Water absorption ≤ 2.5%. Generally, low-quality coarse aggregate is used to prepare concrete, ...
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IPC IPC(8): C04B28/00C04B14/02C04B14/06C04B18/08
CPCC04B2111/29C04B2111/20C04B28/02Y02W30/91C04B14/02C04B14/06C04B14/106C04B18/08C04B20/0092C04B20/0096C04B22/064C04B22/143C04B24/16C04B24/24C04B24/2641C04B40/0028C04B2103/302C04B2103/304
Inventor 胡智农岳修斌陆采荣梅国兴白传贞鲍学高陈建国
Owner NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST