Comparison of Curing Conditions on Physical Properties, Mechanical Strength Development, and Pore Structures of Phosphogypsum-Based Cold-Bonded Aggregates

被引:1
作者
Wang, Guiming [1 ]
Ye, Zhiyi [2 ]
Sun, Tao [3 ,4 ,5 ]
Mo, Zhenlin [6 ]
Wang, Ziyan [1 ]
Ouyang, Gaoshang [1 ]
He, Juntu [1 ]
Deng, Yihua [1 ]
机构
[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, Int Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[3] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[4] Wuhan Univ Technol, Adv Engn Technol Res Inst Zhongshan City, Zhongshan 528437, Peoples R China
[5] Wuhan Univ Technol Sanya, Marine Bldg Mat & Civil Engn Ctr, Sci & Educ Innovat Pk, Sanya 572000, Peoples R China
[6] China Southwest Geotech Invest & Design Inst Corp, Chengdu 610052, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
phosphogypsum-based cold-bonded aggregates; curing condition; humidity; pore structure; specific surface area; C-S-H; FLY-ASH; PORTLAND-CEMENT; SURFACE-AREA; CARBONATION; FTIR; HYDRATION; CONCRETE; TRANSPORT; KINETICS;
D O I
10.3390/ma17204971
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study compared the physical properties and mechanical strength development of PCBAs with water, sealed, standard, and open ambient air curing over 28 days to find a suitable curing method for the production of phosphogypsum-based cold-bonded aggregates. The types and relative amounts of hydration products, microstructural morphology and pore structure parameters were characterized utilizing XRD, TGA, FTIR, SEM and nitrogen adsorption methods. According to the results, water curing leads to rapid increases in single aggregate strength, reaching 5.26 MPa at 7 d. The standard curing condition improved the 28 d mechanical strength of the aggregates by 19.3% over others by promoting the generation of hydration products and the transformation of the C-S-H gel to a higher degree of polymerization and by optimizing the pore structure. Further, PCBAs achieved an excellent solidification of phosphorus impurities under all four curing conditions. This work provides significant guidance for selecting an optimized PCBA curing method for industrial production.
引用
收藏
页数:21
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