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Cemented sand gravel mix proportion design method based on critical sand ratio

A technology of mixing ratio design and cementing gravel, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. Deformation and other problems, to achieve the effect of reducing the input of materials and human resources, solving the large dispersion of strength, and the method is reasonable and scientific

Active Publication Date: 2022-07-05
HUBEI GEZHOUBA TESTING
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AI Technical Summary

Problems solved by technology

[0005] 1. The theoretical design of full package increases the amount of slurry, and cannot give full play to the full advantages of cemented sand and gravel.
[0006] 2. In order to meet the performance requirements of the cemented sand and gravel within the envelope of the finest, average, and coarsest gradations, the recommended mix ratios for different gradations all use the same cementitious material. After wet sieving, the three gradations The strength and elastic modulus of cemented sand and gravel are quite different, so the overall deformation characteristics of cemented sand and gravel will be uneven on site, which is not conducive to future construction quality control

Method used

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  • Cemented sand gravel mix proportion design method based on critical sand ratio
  • Cemented sand gravel mix proportion design method based on critical sand ratio
  • Cemented sand gravel mix proportion design method based on critical sand ratio

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Embodiment 1

[0052] Design index of cemented sand and gravel in the back side of high toe pier in a project: 90d age compressive strength of 6MPa, strength guarantee rate of 80%; cement:fly ash ratio (reference value 4:6), low water-cement ratio (reference value 4:6) value 0.5 to 0.8). The proportions of the coarsest grading, the finest grading and the average grading of sand and gravel are shown in Table 1.

[0053] Table 1 Proportion of sand and gravel materials for mixing ratio test at all levels

[0054]

[0055]

[0056] Through laboratory tests, the relationship between mortar margin and mortar strength under different water-binder ratios is shown in Table 2. The mortar strength is converted into cemented sand and gravel strength according to the conversion factor of 0.50, as shown in Table 3.

[0057] Table 2 The relationship between mortar margin and mortar strength under different water-binder ratios (MPa)

[0058]

[0059] Table 3 The results of the relationship between...

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Abstract

The invention relates to a cemented sand gravel mix proportion design method based on a critical sand ratio as a reference, and the mix proportion is adjusted up and down on site according to different grading changes, the critical sand ratio of the reference mix proportion, namely the reference mix proportion when the mortar margin is 1.0, so that the problems of large strength dispersion and uneconomy are solved. Compared with a conventional cemented sand gravel method for various performance contrast tests, the method is more reasonable and scientific, the material and human resource investment is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a method for designing a cemented sand-gravel mix ratio based on a critical sand ratio. Background technique [0002] Cemented sand-gravel material refers to the material with certain strength formed by using cementitious material and sand-gravel material through mixing, paving and vibration rolling. This dam-building technology is different from conventional earth-rock dam and gravity dam, which brings remarkable effects. Yes: greatly reduce costs, environmental protection, efficient and rapid construction to build a high-safety dam. [0003] At present, the design method of cemented sand-gravel mix ratio in the domestic construction projects is mainly carried out with reference to the guide SL674 mix ratio design method, and the mix ratio design principle is to determine the "mix ratio control range". According to the preparation strength of cementit...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/08C04B14/06Y02W30/91
Inventor 朱圣敏薄茗月黄莉郭光文余英谭恺炎陈卫烈张振宇陈志远董志广
Owner HUBEI GEZHOUBA TESTING
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