常规分散纳米碳酸钙对混凝土性能的影响研究
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摘要
纳米材料具备促进水泥水化、改善混凝土力学性能及提高混凝土耐久性等潜能,在水泥混凝土中的应用得到广泛关注。将纳米碳酸钙采用常规分散方式掺入普通水泥混凝土中,以期改善混凝土的各项性能,并为纳米碳酸钙在水泥混凝土中的规模化应用提供参考。研究了常规分散方式下不同纳米碳酸钙掺量对水泥混凝土工作性能及力学性能的影响,测试了掺入纳米碳酸钙后各组混凝土的抗冻融循环性能、抗碳化能力及干燥收缩等耐久性指标,并系统分析了纳米碳酸钙的掺入对水泥混凝土工作性、力学性能、耐久性的影响机理。研究结果表明:纳米碳酸钙以常规分散方式加入,在掺量适宜的条件下,可以明显改善水泥混凝土的流动性,提高混凝土的强度,降低混凝土的压折比,增强混凝土的韧性;还会对水泥混凝土的耐久性产生一定的影响,增强了混凝土的抗冻融循环性能和抗碳化能力,但也会导致混凝土的干燥收缩值略有增大。采用常规分散方式向水泥混凝土中掺入纳米碳酸钙,其掺量不宜超过胶凝材料质量的1.0%。若掺量过高,将显著降低水泥混凝土的流动性、力学性能及耐久性。
Utilization of nanomaterials in concrete has been gaining widespread attention as it exhibits potential of accelerating the hydration of cement,improving the mechanical property and the durability of concrete. Nano-CaCO_3 is adopted into portland cement concrete with conventional dispersion method to improve concrete performance. It can provide the reference for the large-scale application of nanomaterials in cement concrete. The influences of different Nano-CaCO_3 contents on the workability and mechanical properties of cement concrete with conventional dispersion method are investigated. The durability indicators,such as freeze-thaw resistance,anti-carbonization and drying shrinkage of the concrete with different Nano-CaCO_3 contents are also tested. The influence mechanism of adding Nano-CaCO_3 on workability,mechanical property and durability are also studied. The result shows that(1) the suitable dosage of nano-CaCO_3 is adopted into cement concrete with conventional dispersion method,thus the fluidity is improved remarkably,the strength is improved,the ratio of compressive strength to flexural strength is reduced,and the toughness is increased;(2) the addition of Nano-CaCO_3 has an impact on the durability of concrete,the frost resistance and carbonation resistance are effectively reinforced,while the drying shrinkage of concrete is increased slightly;(3) the addition dosage of Nano-CaCO_3 into cement concrete with conventional dispersion method should not exceed 1.0% of cementitious material weight,otherwise the flowability,the mechanical property and the durability of cement concrete will be significantly decreased.
Utilization of nanomaterials in concrete has been gaining widespread attention as it exhibits potential of accelerating the hydration of cement,improving the mechanical property and the durability of concrete. Nano-CaCO_3 is adopted into portland cement concrete with conventional dispersion method to improve concrete performance. It can provide the reference for the large-scale application of nanomaterials in cement concrete. The influences of different Nano-CaCO_3 contents on the workability and mechanical properties of cement concrete with conventional dispersion method are investigated. The durability indicators,such as freeze-thaw resistance,anti-carbonization and drying shrinkage of the concrete with different Nano-CaCO_3 contents are also tested. The influence mechanism of adding Nano-CaCO_3 on workability,mechanical property and durability are also studied. The result shows that(1) the suitable dosage of nano-CaCO_3 is adopted into cement concrete with conventional dispersion method,thus the fluidity is improved remarkably,the strength is improved,the ratio of compressive strength to flexural strength is reduced,and the toughness is increased;(2) the addition of Nano-CaCO_3 has an impact on the durability of concrete,the frost resistance and carbonation resistance are effectively reinforced,while the drying shrinkage of concrete is increased slightly;(3) the addition dosage of Nano-CaCO_3 into cement concrete with conventional dispersion method should not exceed 1.0% of cementitious material weight,otherwise the flowability,the mechanical property and the durability of cement concrete will be significantly decreased.
引文
[1] 袁哲俊.纳米科学与技术[M].哈尔滨:哈尔滨工业大学出版社,2005.YUAN Zhe-jun.Nano Science and Technology[M].Harbin:Harbin Institute of Technology Press,2005.
[2] 刘吉平.纳米科学与技术[M].北京:科学出版社,2002.LIU Ji-ping.Nano Science and Technology[M].Beijing:Science Press,2002.
[3] TAYLOR H F W.Nanostructure of C-S-H:Current Status[J].Advanced Cement Based Materials,1993,1(1):38-46.
[4] 王冲,蒲心诚,刘芳,等.纳米颗粒材料在水泥基材料中应用的可行性研究[J].新型建筑材料,2003 (2):22-23.WANG Chong,PU Xin-cheng,LIU Fang,et al.Feasibility Study of Application of Nanoparticle Materials in Cement Basted Materials[J].New Building Materials,2003(2):22-23.
[5] 叶青,张泽南,孔德玉,等.掺纳米SiO2和掺硅粉高强混凝土性能的比较[J].建筑材料学报,2003,6 (4):381-385.YE Qing,ZHANG Ze-nan,KONG De-yu,et al.Comparison of Properties of High Strength Concrete with Nano-SiO2 and Silica Fume Added[J].Journal of Building Materials,2003,6 (4):381-385.
[6] JO B W,KIM C H,TAE G H,et al.Characteristics of Cement Mortar with Nano-SiO2 Particles[J].Construction and Building Materials,2007,21(6):1351-1355.
[7] 黄政宇,祖天钰.纳米CaCO3对超高性能混凝土性能影响的研究[J].硅酸盐通报,2013,32(6):1103-1109,1125.HUANG Zheng-yu,ZU Tian-yu.Influence of Nano-CaCO3 on Ultra High Performance Concrete[J].Bulletin of the Chinese Ceramic Society,2013,32(6):1103-1109,1125.
[8] 刘立军.纳米CaCO3钢纤维复合增强混凝土韧性的研究[D].天津:天津大学,2009.LIU Li-jun.Study on Increasing Toughness of Cement Concrete by Using Nano-CaCO3 Steel Fiber Composite[D].Tianjin:Tianjin University,2009.
[9] 李固华,高波.纳米微粉SiO2和CaCO3对混凝土性能影响[J].铁道学报,2006,28(1):131-136.LI Gu-hua,GAO Bo.Effect of Level SiO2 and Level CaCO3 on Concrete Performance [J].Journal of the China Railway Society,2006,28(1):131-136.
[10] 陆平,陆树标.CaCO3对C3S水化的影响[J].硅酸盐学报,1984,15(4):289-294.LU Ping,LU Shu-biao.Effect of Calcium Carbonate on the Hydration of C3S[J].Journal of the Chinese Ceramic Society,1984,15(4):289-294.
[11] SATO T,DIALLO F.Seeding Effect of Nano-CaCO3 on the Hydration of Tricalcium Silicate[J].Transportation Research Record,2010,2141:61-67.
[12] 徐迅,卢忠远.纳米SiO2对硅酸盐水泥水化放热特性的影响[J].南京工业大学学报,2007,29(4):45-48.XU Xun,LU Zhong-yuan.Effect of Nano-SiO2 on Heat of Hydration of Portland Cement[J].Journal of Nanjing University:Natural Sciences Edition,2007,29(4):45-48.
[13] 徐迅,卢忠远.纳米二氧化硅对硅酸盐水泥水化硬化的影响[J].硅酸盐学报,2007,35(4):478-484.XU Xun,LU Zhong-yuan.Effect of Nano-silicon Dioxide on Hydration and Havening of Portland Cement[J].Journal of the Chinese Ceramic Society,2007,35(4):478-484.
[14] 张士萍,邓敏,吴建华.孔结构对混凝土抗冻性的影响[J].武汉理工大学学报,2008,30(6):56-59.ZHANG Shi-ping,DENG Min,WU Jian-hua.Effect of Pore Structure on the Frost Resistance of Concrete[J].Journal of Wuhan University of Technology,2008,30(6):56-59.
[15] 黄政宇,曹方良.纳米材料对超高性能混凝土性能的影响[J].材料导报,2012,26(9):136-141.HUANG Zheng-yu,CAO Fang-liang.Effects of Nano-materials on the Performance of UHPC[J].Materials Review,2012,26(9):136-141.
[16] 王冲,刘俊超,张超,等.纳米CaCO3对水泥基材料性能与结构的影响及机理[J].湖南大学学报:自然科学版,2016,43(6):22-28.WANG Chong,LIU Jun-chao,ZHANG Chao,et al.Influence and Mechanism of Nano-CaCO3 on Properties and Structures of Cement-based Materials[J].Journal of Hunan University:Natural Sciences Edition,2016,43(6):22-28.
[17] 张茂花.纳米路面混凝土的全寿命性能[D].哈尔滨:哈尔滨工业大学,2007.ZHANG Mao-hua.Life-cycle Performance of Nano-pavement Concrete[D].Harbin:Harbin Institute of Technology,2007.
[18] 王家滨,牛荻涛.盐湖卤水侵蚀喷射混凝土衬砌耐久性能退化规律研究[J].硅酸盐通报,2019,38(1):33-40.WANG Jia-bin,NIU Di-tao.Research on Durability Performance Deterioration Rules of Brine-exposed Shotcrete in Salt Lake Environment[J].Bulletin of the Chinese Ceramic Society,2019,38(1):33-40.
[2] 刘吉平.纳米科学与技术[M].北京:科学出版社,2002.LIU Ji-ping.Nano Science and Technology[M].Beijing:Science Press,2002.
[3] TAYLOR H F W.Nanostructure of C-S-H:Current Status[J].Advanced Cement Based Materials,1993,1(1):38-46.
[4] 王冲,蒲心诚,刘芳,等.纳米颗粒材料在水泥基材料中应用的可行性研究[J].新型建筑材料,2003 (2):22-23.WANG Chong,PU Xin-cheng,LIU Fang,et al.Feasibility Study of Application of Nanoparticle Materials in Cement Basted Materials[J].New Building Materials,2003(2):22-23.
[5] 叶青,张泽南,孔德玉,等.掺纳米SiO2和掺硅粉高强混凝土性能的比较[J].建筑材料学报,2003,6 (4):381-385.YE Qing,ZHANG Ze-nan,KONG De-yu,et al.Comparison of Properties of High Strength Concrete with Nano-SiO2 and Silica Fume Added[J].Journal of Building Materials,2003,6 (4):381-385.
[6] JO B W,KIM C H,TAE G H,et al.Characteristics of Cement Mortar with Nano-SiO2 Particles[J].Construction and Building Materials,2007,21(6):1351-1355.
[7] 黄政宇,祖天钰.纳米CaCO3对超高性能混凝土性能影响的研究[J].硅酸盐通报,2013,32(6):1103-1109,1125.HUANG Zheng-yu,ZU Tian-yu.Influence of Nano-CaCO3 on Ultra High Performance Concrete[J].Bulletin of the Chinese Ceramic Society,2013,32(6):1103-1109,1125.
[8] 刘立军.纳米CaCO3钢纤维复合增强混凝土韧性的研究[D].天津:天津大学,2009.LIU Li-jun.Study on Increasing Toughness of Cement Concrete by Using Nano-CaCO3 Steel Fiber Composite[D].Tianjin:Tianjin University,2009.
[9] 李固华,高波.纳米微粉SiO2和CaCO3对混凝土性能影响[J].铁道学报,2006,28(1):131-136.LI Gu-hua,GAO Bo.Effect of Level SiO2 and Level CaCO3 on Concrete Performance [J].Journal of the China Railway Society,2006,28(1):131-136.
[10] 陆平,陆树标.CaCO3对C3S水化的影响[J].硅酸盐学报,1984,15(4):289-294.LU Ping,LU Shu-biao.Effect of Calcium Carbonate on the Hydration of C3S[J].Journal of the Chinese Ceramic Society,1984,15(4):289-294.
[11] SATO T,DIALLO F.Seeding Effect of Nano-CaCO3 on the Hydration of Tricalcium Silicate[J].Transportation Research Record,2010,2141:61-67.
[12] 徐迅,卢忠远.纳米SiO2对硅酸盐水泥水化放热特性的影响[J].南京工业大学学报,2007,29(4):45-48.XU Xun,LU Zhong-yuan.Effect of Nano-SiO2 on Heat of Hydration of Portland Cement[J].Journal of Nanjing University:Natural Sciences Edition,2007,29(4):45-48.
[13] 徐迅,卢忠远.纳米二氧化硅对硅酸盐水泥水化硬化的影响[J].硅酸盐学报,2007,35(4):478-484.XU Xun,LU Zhong-yuan.Effect of Nano-silicon Dioxide on Hydration and Havening of Portland Cement[J].Journal of the Chinese Ceramic Society,2007,35(4):478-484.
[14] 张士萍,邓敏,吴建华.孔结构对混凝土抗冻性的影响[J].武汉理工大学学报,2008,30(6):56-59.ZHANG Shi-ping,DENG Min,WU Jian-hua.Effect of Pore Structure on the Frost Resistance of Concrete[J].Journal of Wuhan University of Technology,2008,30(6):56-59.
[15] 黄政宇,曹方良.纳米材料对超高性能混凝土性能的影响[J].材料导报,2012,26(9):136-141.HUANG Zheng-yu,CAO Fang-liang.Effects of Nano-materials on the Performance of UHPC[J].Materials Review,2012,26(9):136-141.
[16] 王冲,刘俊超,张超,等.纳米CaCO3对水泥基材料性能与结构的影响及机理[J].湖南大学学报:自然科学版,2016,43(6):22-28.WANG Chong,LIU Jun-chao,ZHANG Chao,et al.Influence and Mechanism of Nano-CaCO3 on Properties and Structures of Cement-based Materials[J].Journal of Hunan University:Natural Sciences Edition,2016,43(6):22-28.
[17] 张茂花.纳米路面混凝土的全寿命性能[D].哈尔滨:哈尔滨工业大学,2007.ZHANG Mao-hua.Life-cycle Performance of Nano-pavement Concrete[D].Harbin:Harbin Institute of Technology,2007.
[18] 王家滨,牛荻涛.盐湖卤水侵蚀喷射混凝土衬砌耐久性能退化规律研究[J].硅酸盐通报,2019,38(1):33-40.WANG Jia-bin,NIU Di-tao.Research on Durability Performance Deterioration Rules of Brine-exposed Shotcrete in Salt Lake Environment[J].Bulletin of the Chinese Ceramic Society,2019,38(1):33-40.