珊瑚砂掺量对超高性能混凝土力学及干湿循环耐久性的影响研究
引用文献：
温媛媛 弓永胜 任蓉 闫建文. 珊瑚砂掺量对超高性能混凝土力学及干湿循环耐久性的影响研究[J]. 建筑结构，2023，48（10）：82-85，81.
WEN Yuanyuan GONG Yongsheng REN Rong YAN Jianwen. Study on influence of coral sand content on mechanics and dry-wet cycle durability of ultra-high performance concrete[J]. Building Structure，2023,48（10）：82-85，81.
摘要：为研究珊瑚砂掺量对超高性能混凝土(UHPC)的抗压、抗折力学性能及干湿循环耐久性的影响，用珊瑚砂取代石英砂制备成UHPC,替代率分别为0%、20%、40%、60%、80%、100%,研究了不同珊瑚砂掺量的UHPC的抗压、抗折和抗硫酸盐干湿循环能力。结果表明：在标准养护28d后，掺入100%的珊瑚砂UHPC的抗压强度为108.9MPa,抗折强度为37.7MPa,珊瑚砂由于其吸水性强的特点会抑制UHPC早期抗压强度(28d前)的发展，抗折强度变化率高于抗压强度；随着硫酸钠干湿循环次数的增加，UHPC抗压强度逐渐增加，珊瑚砂掺量与抗压强度差值之间存在较好的相关性；干湿循环15次时，UHPC基体中水泥砂浆结构更加疏松多孔，孔隙直径较大，水化产物晶体数量少，而干湿循环60次时，珊瑚砂掺量为100%的UHPC组的扫描电镜中钙矾石晶体发育状态良好，其结构尺寸较小且极为纤细。
关键词：珊瑚砂；超高性能混凝土；抗压强度；抗折强度；干湿循环；耐久性；
基金：山西省教育厅职业院校教师素质提高计划国家级培训项目（ZDF03-FC190901＿2）。
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参考文献[1] REN Q,ZENG Z Y,JIANG Z W,et al.Functionalization of renewable bamboo charcoal to improve indoor environment quality in a sustainable way[J].Journal of Cleaner Production,2020,246:119028.
[2] 杨汉杰，莫时旭，郑艳.超高性能混凝土翼板-窄幅钢箱组合梁双重组合作用试验与有限元分析[J].建筑结构，2022,52(13):69-76.
[3] LIU K,YU R,SHUI Z,et al.Optimization of autogenous shrinkage and microstructure for Ultra-High Performance Concrete (UHPC)based on appropriate application of porous pumice[J].Construction and Building Materials,2019,214:369-381.
[4] LAI J,YIN X,LI H,et al.Anti-penetration and explosion performance of ultra-high performance concrete based on the principle of functional gradient[J].Journal of the Chinese Ceramic Society,2020,48(3):1188-1200.
[5] HABEL K,VIVIANI M,DENARIÉ E,et al.Development of the mechanical properties of an Ultra-High Performance Fiber Reinforced Concrete (UHPFRC)[J].Cement and Concrete Research,2006,36(7):1362-1370.
[6] PEYVANDI A,SBIA L A,SOROUSHIAN P,et al.Effect of the cementitious paste density on the performance efficiency of carbon nanofiber in concrete nanocomposite[J].Construction and Building Materials,2013,48:265-269.
[7] HE B,ZHU X P,REN Q,et al.Effects of fibers on flexural strength of ultra-high-performance concrete subjected to cryogenic attack[J].Construction and Building Materials,2020,265:120323.
[8] YOO D Y,SOHN H K,BORGES P H R,et al.Enhancing the tensile performance of ultra-high-performance concrete through strategic use of novel half-hooked steel fibers[J].Journal of Materials Research and Technology,2020,9(3):2914-2925.
[9] CHRIST R,PACHECO F,EHRENBRING H,et al.Study of mechanical behavior of ultra-high-performance concrete (UHPC)reinforced with hybrid fibers and with reduced cement consumption[J].Revista Ingenieria de Construccion,2019,34(5),159-168.
[10] 李聪，黄伟，陈宝春.粉煤灰超高性能混凝土收缩与抗压强度相关性研究[J].福州大学学报(自然科学版),2019,47(2):251-257.
[11] 王倩楠，顾春平，孙伟.水泥-粉煤灰-硅灰基超高性能混凝土水化过程微观结构的演变规律[J].材料导报，2017,31(23):85-89.
[12] DEMPSEY G.Coral and salt water as concrete materials[J].ACI Journal Proceedings,1951,48(10):157-166.
[13] HAYNES H,ONEILL R,NEFF M,et al.Salt weathering distress on concrete exposed to sodium sulfate environment[J].ACI Materials Journal,2008,105(1):35-43.
[14] IRASSAR E F,DI MAIO A,BATIC O R.Sulfate attack on concrete with mineral admixtures[J].Cement and Concrete Research,1996,26(1):113-123.
[15] Standard Practice for the Preparation of Substitute Ocean Water:ASTM D1141-98[S].Philadelphia:US-ASTM,2003.
[16] LIU K Z,YU R,SHUI Z H,et al.Influence of external water introduced by coral sand on autogenous shrinkage and microstructure development of Ultra-High Strength Concrete (UHSC)[J].Construction and Building Materials,2020,252:119111.
[2] 杨汉杰，莫时旭，郑艳.超高性能混凝土翼板-窄幅钢箱组合梁双重组合作用试验与有限元分析[J].建筑结构，2022,52(13):69-76.
[3] LIU K,YU R,SHUI Z,et al.Optimization of autogenous shrinkage and microstructure for Ultra-High Performance Concrete (UHPC)based on appropriate application of porous pumice[J].Construction and Building Materials,2019,214:369-381.
[4] LAI J,YIN X,LI H,et al.Anti-penetration and explosion performance of ultra-high performance concrete based on the principle of functional gradient[J].Journal of the Chinese Ceramic Society,2020,48(3):1188-1200.
[5] HABEL K,VIVIANI M,DENARIÉ E,et al.Development of the mechanical properties of an Ultra-High Performance Fiber Reinforced Concrete (UHPFRC)[J].Cement and Concrete Research,2006,36(7):1362-1370.
[6] PEYVANDI A,SBIA L A,SOROUSHIAN P,et al.Effect of the cementitious paste density on the performance efficiency of carbon nanofiber in concrete nanocomposite[J].Construction and Building Materials,2013,48:265-269.
[7] HE B,ZHU X P,REN Q,et al.Effects of fibers on flexural strength of ultra-high-performance concrete subjected to cryogenic attack[J].Construction and Building Materials,2020,265:120323.
[8] YOO D Y,SOHN H K,BORGES P H R,et al.Enhancing the tensile performance of ultra-high-performance concrete through strategic use of novel half-hooked steel fibers[J].Journal of Materials Research and Technology,2020,9(3):2914-2925.
[9] CHRIST R,PACHECO F,EHRENBRING H,et al.Study of mechanical behavior of ultra-high-performance concrete (UHPC)reinforced with hybrid fibers and with reduced cement consumption[J].Revista Ingenieria de Construccion,2019,34(5),159-168.
[10] 李聪，黄伟，陈宝春.粉煤灰超高性能混凝土收缩与抗压强度相关性研究[J].福州大学学报(自然科学版),2019,47(2):251-257.
[11] 王倩楠，顾春平，孙伟.水泥-粉煤灰-硅灰基超高性能混凝土水化过程微观结构的演变规律[J].材料导报，2017,31(23):85-89.
[12] DEMPSEY G.Coral and salt water as concrete materials[J].ACI Journal Proceedings,1951,48(10):157-166.
[13] HAYNES H,ONEILL R,NEFF M,et al.Salt weathering distress on concrete exposed to sodium sulfate environment[J].ACI Materials Journal,2008,105(1):35-43.
[14] IRASSAR E F,DI MAIO A,BATIC O R.Sulfate attack on concrete with mineral admixtures[J].Cement and Concrete Research,1996,26(1):113-123.
[15] Standard Practice for the Preparation of Substitute Ocean Water:ASTM D1141-98[S].Philadelphia:US-ASTM,2003.
[16] LIU K Z,YU R,SHUI Z H,et al.Influence of external water introduced by coral sand on autogenous shrinkage and microstructure development of Ultra-High Strength Concrete (UHSC)[J].Construction and Building Materials,2020,252:119111.
Study on influence of coral sand content on mechanics and dry-wet cycle durability of ultra-high performance concrete
Abstract: In order to study the influences of compressive, flexural mechanical properties and dry-wet cycle durability of coral sand content to ultra-high performance concrete(UHPC), coral sand was used to replace quartz sand to prepare UHPC, and the substitution rate was 0%, 20%, 40%, 60%, 80% and 100% respectively to study the compressive, flexural and sulfate dry-wet cycle resistance of UHPC with different coral sand contents. The results show that after 28 days of standard curing, the compressive strength of UHPC mixed with 100% coral sand is 108.9 MPa, and the flexural strength is 37.7 MPa. Because of its strong water absorption, coral sand can inhibit the development of early compressive strength of UHPC(before 28d), and the change rate of flexural strength is higher than that of compressive strength. The compressive strength of UHPC increased gradually with the increase of dry-wet cycles of sodium sulfate, and there is a good correlation between the content of coral sand and the difference of compressive strength. When the dry-wet cycles are 15 times, the structure of cement mortar in the UHPC matrix is more loose and porous, the pore diameter is larger, and the number of hydration product crystals is less. However, when the dry-wet cycles are 60 times, the crystal of ettringite in the UHPC group with 100% coral sand content is in a good state, and its structure size is small and extremely slim.
Keywords: coral sand; ultra-high performance concrete(UHPC); compressive strength; flexural strength; wet-dry cycle; durability
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