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Regenerated cement concrete for pavement and its preparing process

A recycled cement and concrete technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of bending strength, crack resistance toughness and impact resistance, etc., to achieve crack resistance and toughness The effect of improved impact resistance, reasonable proportion and improved performance

Inactive Publication Date: 2008-02-20
王军龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a new type of road-use recycled cement concrete and its preparation method, so as to overcome the problem that the flexural strength, crack resistance toughness and impact resistance of the prior art are greatly reduced after long-term use.

Method used

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  • Regenerated cement concrete for pavement and its preparing process

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Embodiment Construction

[0027] The present invention will be further described below by way of examples.

[0028] A recycled cement concrete for roads is prepared from raw materials with the following mass ratios. The water-cement ratio is the effective water-cement ratio (that is, the mass ratio of mixing water to the corresponding amount of cement). The amount that regenerated coarse aggregate replaces natural coarse aggregate in embodiment 1,2,3 is 30%, the amount that regenerated coarse aggregate replaces natural coarse aggregate in embodiment 4,5,6 is 50%, embodiment 7, In 8 and 9, the amount of recycled coarse aggregate replacing natural coarse aggregate is 70%.

[0029] Example

[0030] Recycled coarse aggregate: The strength grade of the base concrete is required to range from C15 to C40, the maximum particle size is 20mm, the natural water content shall not exceed 4%, the saturated water absorption shall not exceed 8%, the mud content shall be less than 3%, and the Loss Abrasion A...

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Abstract

The invention discloses a new road regenerating cement concrete and preparing method, which comprises the following parts: 15%-37% regenerating rough aggregate, 15%- 37% natural rough aggregate, 16%-18% cement, 22%-24% sand, 8%-10% water (mixing water and additional water), 0.6%-1.2% steel fiber corresponding to the sum of component bulk and 0.1%-0.5% high-effect water reducer corresponding to cement quantity. The invention overcomes low bending-proof strength, which improves cracking-proof flexibility and impaction-proof ability greatly.

Description

Technical field: [0001] The invention relates to pavement construction materials in the field of road engineering, in particular to a road-use recycled cement concrete and a preparation method thereof. Background technique: [0002] Recycled coarse aggregate (RCA for short) is the coarse aggregate formed after comprehensive treatment of waste concrete such as crushing, cleaning and grading, and all or part of the natural coarse aggregate (Natural coarse aggregate) aggregate (NCA for short) is called recycled cement concrete. The use of recycled coarse aggregate to prepare concrete is one of the main measures to develop green concrete. Therefore, many foreign universities and government research institutions have conducted research on it. Compared with foreign countries, my country's research in this area started late, so strengthening the development and utilization of waste concrete in my country can not only effectively solve the shortage of natural coarse aggregate, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/16C04B14/06C04B14/48
CPCY02W30/91
Inventor 王军龙
Owner 王军龙