In order to reduce the amount of cementitious materials in ultra-high performance concrete (UHPC), we prepared UHPC specimens containing coarse dolomite aggregate (CDA) and investigated the effects of CDA content and steel fiber volume on compressive strength, flexural strength, elastic modulus, uniaxial tensile property and abrasion resistance of UHPC. Results revealed that with the increase of CDA dosage, the elastic modulus improved significantly, the compressive and flexural strength of UHPC increased firstly but then decreased. On the one hand, as the volume of steel fiber increased, the uniaxial tensile property of UHPC were enhanced, wherein improving the compressive strength, first cracking strength, post cracking strength and energy absorption capacity of UHPC. On the other hand, the mass loss and depth of abrasion reduced with the increase of steel fiber content which represents the optimization of abrasion resistance of UHPC. When the dosage of CDA was 200 kg/m3 and the volume of steel fiber was 1.5%, the comprehensive performances of UHPC reached the optimum.
Key words
ultra-high performance concrete /
coarse dolomite aggregate /
uniaxial tensile performance /
steel fiber /
abrasion resistance
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] JONES T, CATHER B. Ultra-high Performance Fibre-reinforced Concrete[J]. Concrete Engineering International, 2005, 9(6): 1216-1221.
[2] 梁兴文, 胡翱翔, 于 婧,等. 钢纤维对超高性能混凝土抗弯力学性能的影响[J]. 复合材料学报, 2018, 35(3):722-731.
[3] YOO D Y, YOON Y S. A Review on Structural Behavior, Design, and Application of Ultra-High-Performance Fiber-Reinforced Concrete[J]. International Journal of Concrete Structures & Materials, 2016, 10(2): 125-142.
[4] 鲁 亚, 朱 杰, 王江帆,等. 含粗骨料UHPC在路面修复工程中的应用研究[J]. 交通科技, 2018(1): 5-7,11.
[5] WILLE K, BOISVERT-COTULIO C. Material Efficiency in the Design of Ultra-high Performance Concrete[J]. Construction & Building Materials, 2015, 86: 33-43.
[6] MO A, EL-TAWIL S. Effects of Variations in the Mix Constituents of Ultra high Performance Concrete (UHPC) on Cost and Performance[J]. Materials & Structures, 2016, 49(10): 4185-4200.
[7] 徐立斌, 董 艺, 陈尚伟. 超高性能混凝土的配合比设计研究[J]. 混凝土, 2015(1):72-74.
[8] WANG C, YANG C, LIU F, et al. Preparation of Ultra-High Performance Concrete with Common Technology and Materials[J]. Cement & Concrete Composites, 2004, 26(8): 538-544.
[9] AYDIN S, YAZICI H, YARDIMCI M Y, et al. Effect of Aggregate Type on Mechanical Properties of Reactive Powder Concrete[J]. ACI Materials Journal, 2010, 107(5): 441-449.
[10]冯 浩. 超高性能混凝土早期塑性收缩开裂的研究[D]. 长沙: 湖南大学, 2014.
[11]YANG J, PENG G F, GAO Y X, et al. Mechanical Properties and Durability of Ultra-High Performance Concrete Incorporating Coarse Aggregate[J]. Key Engineering Materials, 2014, 629-630: 96-103.
[12]HANNAWI K, BIAN H, PRINCE-AGBODJAN W, et al. Effect of Different Types of Fibers on the Microstructure and the Mechanical Behavior of Ultra-High Performance Fiber-Reinforced Concretes[J]. Composites Part B Engineering, 2016, 86: 214-220.
[13]张丽辉, 刘建忠, 刘加平,等. 磷酸锌改性钢纤维对UHPC单轴拉伸性能的影响[J]. 混凝土, 2016(9):52-55.
[14]高绪明. 钢纤维对超高性能混凝土性能影响的研究[D].长沙:湖南大学, 2013.
[15]LIU J, HAN F, CUI G, et al. Combined Effect of Coarse Aggregate and Fiber on Tensile Behavior of Ultra-high Performance Concrete[J]. Construction & Building Materials, 2016, 121: 310-318.
[16]张亚坤, 侯黎黎. 纤维混凝土在水利工程中的应用[J]. 长江科学院院报, 2012, 29(10):114-117.
[17]GB/T 2419—2005,水泥胶砂流动度的测定方法[S]. 北京:中国标准出版社,2005.
[18]GB/T 31387—2015,活性粉末混凝土[S]. 北京:中国标准出版社,2015.
PDF(1711 KB)
