Performance Regulation and Sulfate Erosion Mechanism of Low-Heat and Low-Shrinkage Coral Aggregate Seawater Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0681

Abstract

Abstract: To address the issues of high cementitious material consumption, susceptibility to thermal cracks and drying shrinkage cracks, and accelerated performance degradation in high-strength coral aggregate seawater concrete (CASC) under tropical island and reef environments, this study investigated the preparation and mechanical properties of low-heat CASC and low-shrinkage CASC with different strength grades. The heat release, shrinkage, and impermeability characteristics were elucidated, and the failure modes and evolution mechanisms of mechanical properties of low-heat CASC and low-shrinkage CASC were revealed. The results indicate that replacing 10% (mass fraction) of cement with coral powder reduces the heat release of CASC by 5.4%, while incorporating "expansive agent + superabsorbent polymer" reduces shrinkage by 10%. The impermeability grade of C30 low-shrinkage CASC is P14, and the impermeability grades of C55 low-heat CASC and low-shrinkage CASC are P16 and P17, respectively. Sulfate has a promoting and early strengthening effect on the CASC hydration process. The addition of "expansive agent + superabsorbent polymer" not only improves the shrinkage resistance of CASC, but also reduces its brittleness and enhances mechanical properties, whereas coral powder only mitigates brittleness.

Key words: low-heat coral aggregate seawater concrete, low-shrinkage coral aggregate seawater concrete, preparation method, mechanical property, sulfate erosion

CLC Number:

TU528

DA Bo, CHEN Yixiao, HAN Yudong, QING Jiajun, YU Hongfa. Performance Regulation and Sulfate Erosion Mechanism of Low-Heat and Low-Shrinkage Coral Aggregate Seawater Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4028-4036.

References

[1] 达波, 余红发, 麻海燕, 等. 南海海域珊瑚混凝土结构的耐久性影响因素[J]. 硅酸盐学报, 2016, 44(2): 253-260.
DA B, YU H F, MA H Y, et al. Factors influencing durability of coral concrete structure in the South China Sea[J]. Journal of the Chinese Ceramic Society, 2016, 44(2): 253-260 (in Chinese).
[2] CHU Y J, WANG A G, ZHU Y C, et al. Enhancing the performance of basic magnesium sulfate cement-based coral aggregate concrete through gradient composite design technology[J]. Composites Part B: Engineering, 2021, 227: 109382.
[3] DA B, YU H F, MA H Y, et al. Experimental investigation of whole stress-strain curves of coral concrete[J]. Construction and Building Materials, 2016, 122: 81-89.
[4] DA B, CHEN Y, YU H F, et al. Preparation technology, mechanical properties and durability of coral aggregate seawater concrete in the island-reef environment[J]. Journal of Cleaner Production, 2022, 339: 130572.
[5] 刁益彤, 麻海燕, 余红发, 等. 珊瑚混凝土骨料-净浆界面区强度[J]. 建筑材料学报, 2021, 24(3): 516-524.
DIAO Y T, MA H Y, YU H F, et al. Strength of aggregate-paste interface transition zone of coral concrete[J]. Journal of Building Materials, 2021, 24(3): 516-524 (in Chinese).
[6] MA H Y, FAN H T, YU H F, et al. Effect of using grounded coral sand on hydration and strength development of Portland cement paste: experimental and GEMS modelling investigation[J]. Journal of Building Engineering, 2023, 68: 106001.
[7] 王恺. 全珊瑚混凝土的收缩、徐变试验研究[D]. 桂林: 桂林理工大学, 2018.
WANG K. Experimental study on shrinkage and creep of all-coral concrete[D]. Guilin: Guilin University of Technology, 2018 (in Chinese).
[8] 韩宇栋, 谢月, 岳清瑞, 等. 组合膨胀剂对风电灌浆料早期膨胀性能的影响[J]. 建筑材料学报, 2024, 27(7): 611-619.
HAN Y D, XIE Y, YUE Q R, et al. Effect of composite expansive agent on early-age expansion properties of cementitious grouting material for wind power project[J]. Journal of Building Materials, 2024, 27(7): 611-619 (in Chinese).
[9] 刘宁宇. 大体积钢筋混凝土结构抗裂监测与分析[D]. 哈尔滨: 哈尔滨工程大学, 2023.
LIU N Y. Monitoring and analysis of crack resistance of large-volume reinforced concrete structures[D]. Harbin: Harbin Engineering University, 2023 (in Chinese).
[10] WANG Z B, LIU W K, ZUO J P, et al. Strength and fracture properties of coral concrete under impact of coral aggregate type and fiber hybridization[J]. Journal of Central South University, 2024, 31(5): 1592-1607.
[11] 李威, 韩宇栋, 岳清瑞, 等. 膨胀剂和高吸水树脂组合对混凝土收缩的影响[J]. 工业建筑, 2022, 52(10): 115-121.
LI W, HAN Y D, YUE Q R, et al. Influence of combined expansive agent and internal curing water of super absorbent polymer on concrete shrinkage[J]. Industrial Construction, 2022, 52(10): 115-121 (in Chinese).
[12] CHENG S K, WU Z Y, WU Q Y, et al. Mitigation on the shrinkage properties of ultra-high strength concrete via using porous coral sand and shrinkage reducing agent[J]. Journal of Building Engineering, 2022, 57: 104861.
[13] 宋卫丽, 达波, 刘金文, 等. 附加防护措施海工混凝土抗渗及抗冻性能[J/OL]. 中国表面工程, 2025: 1-13 (2025-03-07) [2025-08-17]. https://link.cnki.net/urlid/11.3905.TG.20250307.0956.002.
SONG W L, DA B, LIU J W, et al. Impermeability and antifreeze performance of marine concrete with additional protective measures[J/OL]. China Surface Engineering, 2025: 1-13 (2025-03-07) [2025-08-17]. https://link.cnki.net/urlid/11.3905.TG.20250307.0956.002 (in Chinese).
[14] 刘超, 姚羿舟, 刘化威, 等. 硫酸盐干湿循环下再生复合微粉混凝土的劣化机理[J]. 建筑材料学报, 2022, 25(11): 1128-1135.
LIU C, YAO Y Z, LIU H W, et al. Deterioration mechanism of recycled composite micronized concrete under sulfate dry and wet cycle[J]. Journal of Building Materials, 2022, 25(11): 1128-1135 (in Chinese).
[15] TANG J W, CHENG H, ZHANG Q B, et al. Development of properties and microstructure of concrete with coral reef sand under sulphate attack and drying-wetting cycles[J]. Construction and Building Materials, 2018, 165: 647-654.
[16] HUANG D G, NIU D T, SU L, et al. Durability of coral aggregate concrete under coupling action of sulfate, chloride and drying-wetting cycles[J]. Case Studies in Construction Materials, 2022, 16: e01003.
[17] 刘云强, 左晓宝, 黎亮, 等. 硫酸盐侵蚀下硬化水泥浆体微结构演变及膨胀过程的数值模拟[J]. 硅酸盐通报, 2022, 41(12): 4128-4138.
LIU Y Q, ZUO X B, LI L, et al. Numerical simulation on microstructure evolution and expansion process of hardened cement paste under sulfate attack[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(12): 4128-4138 (in Chinese).