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Ocean engineering recycled concrete mix proportion design method based on modified CPM model and corrosion inhibitor protection

A technology of recycled concrete and mix ratio design, which is applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve the problem that marine recycled concrete is difficult to meet the design requirements, etc., to make up for poor physical properties and improve densification. degree, good ecological and economic benefits

Active Publication Date: 2021-02-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to meet the design requirements by applying the conventional mix ratio design method to marine recycled concrete, and the mix ratio design process should be improved in a targeted manner

Method used

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  • Ocean engineering recycled concrete mix proportion design method based on modified CPM model and corrosion inhibitor protection
  • Ocean engineering recycled concrete mix proportion design method based on modified CPM model and corrosion inhibitor protection
  • Ocean engineering recycled concrete mix proportion design method based on modified CPM model and corrosion inhibitor protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this example, recycled coarse aggregate I and recycled fine aggregate I are used to prepare marine recycled concrete. The cementitious material is composed of benchmark cement and slag powder. The mixing water is fresh water. The slump is required to reach 150mm and the strength reaches C40 grade.

[0063] (1) Use the modified CPM model to calculate the packing density of recycled coarse aggregate and recycled fine aggregate, such as figure 1 As shown, when the volume ratio of recycled fine aggregate is 44.8%, the peak value is 0.698, that is, the concrete volume sand ratio is 44.8%.

[0064] (2) Determine the composition of the cementitious material, the base cement accounts for 80% by volume, and the slag powder accounts for 20%.

[0065] (3) The volumetric sand ratio remains unchanged at 44.8%. Using the modified CPM model, the packing density of recycled coarse and fine aggregates and cementitious materials is calculated, as shown in figure 2 As shown, when the...

Embodiment 2

[0075] On the basis of Example 1, the mixing water was changed from fresh water to sea water, correspondingly the dosage of sodium metasilicate pentahydrate was increased from 2.0% to 3.0%, and other parameters remained unchanged. At this time, the concrete slump reaches 160mm, the compressive strength at 3d, 7d, and 28d reaches 25.4MPa, 34.7MPa, and 45.1MPa respectively, and the splitting tensile strength at 28d reaches 3.24MPa.

Embodiment 3

[0077] In this example, recycled coarse aggregate II and recycled fine aggregate II are used to prepare marine recycled concrete. The cementitious material is composed of benchmark cement and slag powder. The mixing water is fresh water. The slump is required to reach 150mm and the strength reaches C30 grade.

[0078] (1) Use the modified CPM model to calculate the packing density of recycled coarse aggregate and recycled fine aggregate, such as image 3 As shown, when the volume ratio of recycled fine aggregate is 42.9%, the peak value is 0.707, that is, the concrete volume sand ratio is 42.9%.

[0079] (2) Determine the composition of the cementitious material, the base cement accounts for 80% by volume, and the slag powder accounts for 20%.

[0080] (3) The volumetric sand ratio remains unchanged at 42.9%. Using the modified CPM model, calculate the packing density of recycled coarse and fine aggregates and cementitious materials, as shown in Figure 4 As shown, when the v...

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Abstract

The invention provides an ocean engineering recycled concrete mix proportion design method based on a modified CPM model and corrosion inhibitor protection, which comprises the following steps: firstly, proposing a CPM model modification form, calculating the stacking compactness after recycled aggregate and a cementing material are mixed according to different proportions, and determining the concrete sand ratio and the cement-aggregate ratio; secondly, determining an effective water-binder ratio according to the design strength and a Boromi formula, and obtaining a preliminary calculation mix proportion of concrete by adopting a volume method; thirdly, determining the dosage of the corrosion inhibitor according to the concrete design requirement and the service environment; and finally,adjusting the mixing ratio according to the concrete trial mixing condition. According to the method, the stacking model and the corrosion inhibitor are combined, so that the compactness of the oceanengineering recycled concrete is improved, and the depassivation and corrosion process of the steel bars is delayed.

Description

technical field [0001] The invention relates to the field of resource utilization of construction solid waste in marine engineering, in particular to a design method for the mix ratio of recycled concrete in marine engineering based on a modified CPM model and rust inhibitor protection. Background technique [0002] In recent years, under the background of building a maritime power, the development and utilization of my country's ocean space has entered a new climax, and large-scale coastal or island infrastructure is under construction. As the main building material, concrete has a huge demand, which will accelerate the consumption rate of natural sand and gravel resources. If construction solid waste can be used as raw material and crushed into recycled coarse and fine aggregate for concrete pouring, the shortage of natural sand and gravel resources can be alleviated. Moreover, construction solid waste is easy to collect locally, which is conducive to shortening the const...

Claims

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Application Information

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IPC IPC(8): G06F30/25C04B12/04C04B22/00C04B103/61G06F119/14
CPCG06F30/25C04B12/04C04B22/0026G06F2119/14C04B2103/61
Inventor 孟涛赵羽习卢予奇练松松支点
Owner ZHEJIANG UNIV
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