高强珊瑚混凝土(HSCC)单轴受压性能试验研究  

Experimental Study on Uniaxial Compression Performance of High Strength Coral Concrete(HSCC)

作　　者：张继旺 黄满锋 苏仕参 易金 覃庆龙[3] 王磊 ZHANG Jiwang;HUANG Manfeng;SU Shican;YI Jin;QIN Qinglong;WANG Lei(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China;School of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]广西建筑新能源与节能重点实验室,桂林541004 [2]桂林理工大学土木与建筑工程学院,桂林541004 [3]中国科学院武汉岩土力学研究所,武汉430071

出　　处：《硅酸盐通报》2022年第7期2275-2282,2291,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51868014);广西自然科学基金(2018GXNSFAA281188)。

摘　　要：骨料强度低、缺陷明显导致珊瑚混凝土难以应用于高强度或特殊防护结构。采用小粒径级配的珊瑚砂完全取代粗骨料制备高强珊瑚混凝土(HSCC),系统测试了HSCC的基本力学性能、单轴受压性能和孔隙率等。结果表明:优化骨料粒径和配合比制备的HSCC强度等级为C105,轴心抗压强度与立方体抗压强度的比值在0.86~0.94;未掺加纤维的HSCC失效模式为爆炸性破坏,掺加体积率为0.43%的聚丙烯纤维(PPF)的HSCC表现出明显的延性破坏特征,破坏后在20%~30%极限强度时进入残余强度转折点;HSCC孔隙率约在4.7%~6.9%,干表观密度为2230~2310 kg/m^(3),表面宏观孔洞较少,通过扫描电镜发现骨料边缘填充情况较好。Low strength and obvious defects in the aggregate lead to the difficulty of applying the coral concrete in high strength or special protective structures.The coral sand with small particle size gradation was used to completely replace coarse aggregate to prepare high strength coral concrete(HSCC).The basic mechanical properties,uniaxial compression properties and porosity of HSCC were systematically tested.The results show that the strength grade of HSCC prepared by optimizing the aggregate particle size and mix ratio is C105,and the ratio of axial compressive strength to cube compressive strength is between 0.86 and 0.94.The failure mode of HSCC without fiber is explosive failure,and the HSCC with 0.43%volume rate of polypropylene fiber(PPF)shows obvious ductile failure characteristics.After failure,it enters the turning point of residual strength at 20%~30%ultimate strength.The porosity of HSCC is about 4.7%~6.9%,and the dry apparent density is 2230~2310 kg/m^(3).There are few macroscopic pores on the surface,and it is found that the aggregate edge filling is good by scanning electron microscope.

关 键 词：高强珊瑚混凝土 抗压强度 单轴受压 破坏模式 应力-应变全曲线 

分 类 号：TU528[建筑科学—建筑技术科学]