掺陶砂超高性能轻质混凝土的性能及其影响因素

摘要/Abstract

摘要： 本文研究了水胶比、胶砂比、粉煤灰掺量、硅灰掺量、钢纤维掺量和陶砂密度等级对掺陶砂超高性能轻质混凝土(UHPLC)工作性能、力学性能、表观密度和比强度的影响,确定了最佳配合比,制得了干表观密度为1 950 kg/m³、流动度为233 mm(略高于超高性能混凝土)、28 d抗压/抗折强度不小于120/20 MPa的UHPLC。借助X射线衍射仪和扫描电子显微镜,探讨了UHPLC水化产物、微观形貌随时间的变化规律,并从微观结构角度分析了陶砂与基体、钢纤维与基体的界面过渡区特征,揭示了相同条件下UHPLC比强度随陶砂密度等级增大而增大的变化规律。经过标准化回归系数分析,发现钢纤维掺量对UHPLC强度、密度影响最大,贡献率均大于40%,而对UHPLC流动性影响最显著的因素是水胶比,贡献率为38.18%,胶砂比对流动性有较为明显的影响,贡献率为27.20%。

关键词: 超高性能轻质混凝土, 陶砂, 钢纤维, 水胶比, 表观密度, 贡献率

Abstract: The effects of water-binder ratio, binder-sand ratio, fly ash content, silica fume content, steel fiber content and density grade of pottery sand on working performance, mechanical properties, apparent density and ratio of strength to density of ultra-high performance lightweight concrete (UHPLC) with pottery sand were studied, and the optimal mix ratio was determined. UHPLC with dry apparent density of 1 950 kg/m³, fluidity of 233 mm (slightly higher than that of ultra-high performance concrete) and 28 d compressive/flexural strength not less than 120/20 MPa was prepared. By means of X-ray diffractometer and scanning electron microscope, the variation laws of UHPLC hydration products and microstructure with time were discussed. From the perspective of microstructure, the characteristics of interface transition zone between pottery sand and matrix, steel fiber and matrix were analyzed, and the change law of ratio of strength to density of UHPLC increasing with the increase of density grade of pottery sand was revealed under the same conditions. Through standardized regression coefficient analysis, the results indicate that steel fiber content has the greatest influence on the strength and density of UHPLC, and the contribution rates are greater than 40%. The most significant influence on the fluidity of UHPLC is the water-binder ratio, and the contribution rate is 38.18%. The binder-sand ratio has a more obvious influence on the fluidity of UHPLC, and the contribution rate is 27.20%.

Key words: ultra-high performance lightweight concrete, pottery sand, steel fiber, water-binder ratio, apparent density, contribution rate

中图分类号:

TU528.2

王青, 高舒畅, 高嘉呈, 文长城, 徐港. 掺陶砂超高性能轻质混凝土的性能及其影响因素[J]. 硅酸盐通报, 2023, 42(6): 1996-2006.

WANG Qing, GAO Shuchang, GAO Jiacheng, WEN Changcheng, XU Gang. Performance of Ultra-High Performance Lightweight Concrete with Pottery Sand and Its Influencing Factors[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1996-2006.

参考文献

[1] 徐港, 文长城, 王青, 等. 超高性能混凝土保护层厚度取值分析[J/OL]. 建筑科学与工程学报, 2022: 1-10 (2022-03-11) [2023-02-11]. https://kns. cnki.net/kcms/detail/61.1442.TU.20220310.1639.002.html.
XU G, WEN C C, WANG Q, et al. Value analysis of thickness of ultra-high performance concrete cover[J/OL]. Journal of Architecture and Civil Engineering, 2022: 1-10 (2022-03-11) [2023-02-11]. https://kns.cnki.net/kcms/detail/61.1442.TU.20220310.1639.002.html (in Chinese).
[2] 刘慈军, 王全超, 周玉娟, 等. 机制砂的级配对超高性能混凝土性能的影响[J]. 混凝土, 2022(1): 131-134.
LIU C J, WANG Q C, ZHOU Y J, et al. Effect of gradation of mechanical sand on the performance of ultra-high performance concrete[J]. Concrete, 2022(1): 131-134 (in Chinese).
[3] 王俊颜, 闫珠华, 耿莉萍. 超高性能轻质混凝土的力学性能及微观结构[J]. 哈尔滨工业大学学报, 2019, 51(6): 18-24.
WANG J Y, YAN Z H, GENG L P. The mechanical property and microstructure of ultra-high performance lightweight concrete[J]. Journal of Harbin Institute of Technology, 2019, 51(6): 18-24 (in Chinese).
[4] 王发洲. 高性能轻集料混凝土研究与应用[D]. 武汉: 武汉理工大学, 2003: 7-12.
WANG F Z. Research on high performance lightweight aggregate concrete (HPLC) and its application[D]. Wuhan: Wuhan University of Technology, 2003: 7-12 (in Chinese).
[5] 陈宝春, 季韬, 黄卿维, 等. 超高性能混凝土研究综述[J]. 建筑科学与工程学报, 2014, 31(3): 1-24.
CHEN B C, JI T, HUANG Q W, et al. Review of research on ultra-high performance concrete[J]. Journal of Architecture and Civil Engineering, 2014, 31(3): 1-24 (in Chinese).
[6] 张高展, 葛竞成, 丁庆军, 等. 轻质超高性能混凝土的制备及性能形成机理[J]. 硅酸盐学报, 2021, 49(2): 381-390.
ZHANG G Z, GE J C, DING Q J, et al. Preparation and formation mechanism of lightweight ultra-high performance concrete[J]. Journal of the Chinese Ceramic Society, 2021, 49(2): 381-390 (in Chinese).
[7] 张高展, 王宇譞, 葛竞成, 等. 轻集料对超高性能混凝土工作和力学性能的影响[J]. 建筑材料学报, 2021, 24(3): 499-507.
ZHANG G Z, WANG Y X, GE J C, et al. Effect of lightweight aggregate on workability and mechanical properties of ultra-high performance concrete[J]. Journal of Building Materials, 2021, 24(3): 499-507 (in Chinese).
[8] GÖKÇE H S, SÜRMELIĞOL S, ANDIÇ-ÇAKIRÜ. A new approach for production of reactive powder concrete: lightweight reactive powder concrete (LRPC)[J]. Materials and Structures, 2017, 50(1): 58.
[9] LU J X, SHEN P L, ZHENG H B, et al. Development and characteristics of ultra high-performance lightweight cementitious composites (UHP-LCCs)[J]. Cement and Concrete Research, 2021, 145: 106462.
[10] SHAHEEN E, SHRIVE N. Optimization of mechanical properties and durability of reactive powder concrete[J]. Materials Journal, 2006, 103(6): 444-451.
[11] 中国建筑学会建筑材料分会. 轻骨料混凝土桥梁技术规程: CECS 202—2006[S]. 北京: 中国计划出版社, 2006.
Building Materials Branch of Chinese Architectural Society. Technical specification for lightweight aggregate concrete bridges: CECS 202—2006[S]. Beijing: China Plan Press, 2006 (in Chinese).
[12] American Concrete Institute. Guide for structural lightweight-aggregate concrete: ACI 213R—03[S]. ACI, 2003.
[13] 肖江帆. 常规工艺下超高性能混凝土的制备及性能研究[D]. 长沙: 湖南大学, 2013: 12-25.
XIAO J F. Study on the properties of ultra high performance concrete with common techniques[D]. Changsha: Hunan University, 2013: 12-25 (in Chinese).
[14] 曹润倬, 周茗如, 周群, 等. 超细粉煤灰对超高性能混凝土流变性、力学性能及微观结构的影响[J]. 材料导报, 2019, 33(16): 2684-2689.
CAO R Z, ZHOU M R, ZHOU Q, et al. Effect of ultra-fine fly ash on rheological properties, mechanical properties and microstructure of ultra-high performance concrete[J]. Materials Reports, 2019, 33(16): 2684-2689 (in Chinese).
[15] 卢喆, 冯振刚, 姚冬冬, 等. 超高性能混凝土工作性与强度影响因素分析[J]. 材料导报, 2020, 34(增刊1): 203-208.
LU Z, FENG Z G, YAO D D, et al. Analysis of influencing factors on workability and strength of ultra-high performance concrete[J]. Materials Reports, 2020, 34(supplement 1): 203-208 (in Chinese).
[16] HUANG K H, XIE J H, WANG R H, et al. Effects of the combined usage of nanomaterials and steel fibres on the workability, compressive strength, and microstructure of ultra-high performance concrete[J]. Nanotechnology Reviews, 2021, 10(1): 304-317.
[17] 周朋, 谢松林, 李强. 水胶比对混凝土性能及气孔结构的影响分析[J]. 硅酸盐通报, 2018, 37(3): 974-978.
ZHOU P, XIE S L, LI Q. Effect of water-binder ratio on properties and pore structure of concrete[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(3): 974-978 (in Chinese).
[18] 赵一鹤, 孙振平, 穆帆远, 等. 钢纤维对UHPC拉伸性能及其拔出行为的影响[J]. 建筑材料学报, 2021, 24(2): 276-282.
ZHAO Y H, SUN Z P, MU F Y, et al. Effect of steel fibers on tensile properties of ultra-high performance concrete and its pullout behavior[J]. Journal of Building Materials, 2021, 24(2): 276-282 (in Chinese).
[19] 赵筠, 师海霞, 路新瀛. 超高性能混凝土基本性能与试验方法[M]. 北京: 中国建材工业出版社, 2019.
ZHAO Y, SHI H X, LU X Y. Basic properties and test methods of ultra-high performance concrete[M]. Beijing: China Building Materials Press, 2019 (in Chinese).
[20] LIU X M, CHIA K S, ZHANG M H, et al. Water and chloride ion penetration resistance of high-strength ultra lightweight cement composite[C]//Proceedings of the 1st International Congress on Durability of Concrete. Norwegian Concrete Association, 2012: 1-9.
[21] WANG J Y, CHIA K S, LIEW J Y R, et al. Flexural performance of fiber-reinforced ultra lightweight cement composites with low fiber content[J]. Cement and Concrete Composites, 2013, 43: 39-47.
[22] ZHENG J, LIU G H. The influence and application of slag, fly ash, and limestone flour on compressive strength of concrete based on the concrete compressive strength development over time (CCSDOT) model[J]. Applied Sciences, 2020, 10(10): 3572.
[23] WANG X P, WU D, GENG Q H, et al. Characterization of sustainable ultra-high performance concrete (UHPC) including expanded perlite[J]. Construction and Building Materials, 2021, 303: 124245.
[24] SINGH G. Study on collective effect of silica fume and steel fiber on strength and durability properties of concrete[J]. Materials Today: Proceedings, 2021, 37: 2256-2265.
[25] ABDULKAREEM O M, FRAJ A B, BOUASKER M, et al. Microstructural investigation of slag-blended UHPC: the effects of slag content and chemical/thermal activation[J]. Construction and Building Materials, 2021, 292: 123455.
[26] 郑洪建. 页岩陶砂内养护混凝土实验研究[D]. 大连: 大连理工大学, 2020: 52-55.
ZHENG H J. Experimental study on internal curing concrete with shale pottery sand[D]. Dalian: Dalian University of Technology, 2020: 52-55 (in Chinese).
[27] WANG C, YANG C H, LIU F, et al. Preparation of ultra-high performance concrete with common technology and materials[J]. Cement and Concrete Composites, 2012, 34(4): 538-544.
[28] 丁庆军, 胡俊, 刘勇强, 等. 轻质超高性能混凝土的设计与研究[J]. 混凝土, 2019(9): 1-5.
DING Q J, HU J, LIU Y Q, et al. Research on preparation and performance of lightweight ultra high performance concrete[J]. Concrete, 2019(9): 1-5 (in Chinese).
[29] 袁晟, 颜东煌, 袁明, 等. 养护方式和早龄期对钢纤维-UHPC基体界面黏结性能的影响[J]. 长安大学学报(自然科学版), 2022, 42(6): 133-142.
YUAN S, YAN D H, YUAN M, et al. Effect of curing method and early age on interfacial bond properties of steel fiber-UHPC matrix[J]. Journal of Chang’an University (Natural Science Edition), 2022, 42(6): 133-142 (in Chinese).
[30] 王海燕, 杨方廷, 刘鲁. 标准化系数与偏相关系数的比较与应用[J]. 数量经济技术经济研究, 2006, 23(9): 150-155.
WANG H Y, YANG F T, LIU L. Comparison and application of standardized regressive coefficient & partial correlation coefficient[J]. The Journal of Quantitative & Technical Economics, 2006, 23(9): 150-155 (in Chinese).