2022 SFP 5-1 COMPLETED
Release time: 2024/07/17 Publisher： original Views：
Study on key technology of polymer modified inferior coarse aggregate
Principal Investigator：
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Wang Junwei China Railway Test & Certification Center Limited |
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Project Background:
At present, the global consumption of coarse aggregate for motar and concrete is still growing, but the high-quality resources are diminishing. In some islands and coastal areas, common coarse aggregate resources are scarce. Meanwhile, inferior coarse aggregate or coral reefs are widely distributed on tropical coasts and islands, but it can’t be used largely for the lack of technology. If the inferior coarse aggregate could be treated and reused, which can reduce the over-dependence on natural mineral resources and carry out green and sustainable development.
Aims & Goals:
1. To select the optimal polymer emulsion and reactive powder concrete materials;
2. To improve the application performance and meet the requirements by using the polymer modified inferior aggregate.
3. To search innovative application areas for polymer modified inferior coarse aggregate.
Outcomes:
1. Ethylene vinyl acetate copolymer was applied to form a polymer mortar modifier, with the water absorption rate and adsorption capacity for admixture of polymer modified inferior coarse aggregate reduced by 80%;
2. Developed the pre-mixing process for polymer modified mortar modifier, the initial slump of concrete with polymer modified inferior coarse aggregate increased by 41% compared to unmodified, and the impermeability performance was improved.
PAPER 1: 'Effects of Polymer-Cement Ratio on The Properties of Polymer Mortar' (in Chinese), Advanced Materials of High Speed Railway, 2023, 2(4): 30-33.
PAPER 2: 'Effect of polymer modified volcanic rock coarse aggregate on properties of concrete' (in Chinese),
Railway Quality Control (accepted)
PATENT 1: One mixing and filtering machine for polymer mortar modified coarse aggregate, ZL 202223501265.9 (granted)
DEMONSTRATION: The technology of polymer modified inferior coarse aggregate has been demonstrated in production line of type Ⅲa prestressed concrete sleeper in Liaocheng section on Beijing-Kowloon Railway.
