糜人杰, 余红发, 麻海燕, 达 波, 袁银峰, 张小平, 朱海威, 窦雪梅

(1. 南京航空航天大学 土木工程系，江苏 南京 210016; 2. 江苏交科交通设计研究院，江苏 淮安 223001)

全珊瑚骨料海水混凝土力学性能试验研究

糜人杰1, 余红发1, 麻海燕1, 达 波1, 袁银峰2, 张小平1, 朱海威1, 窦雪梅1

(1. 南京航空航天大学 土木工程系，江苏 南京 210016; 2. 江苏交科交通设计研究院，江苏 淮安 223001)

为了探讨全珊瑚骨料海水混凝土的基本力学性能，并比较其与普通混凝土和轻集料混凝土的差异，通过实验系统测定了珊瑚混凝土的基本力学性能，建立了其轴心抗压强度(fc,m)、劈裂抗拉强度(fsp,m)、抗折强度(ft,m)与立方体抗压强度(fcu,m)之间的线性关系与计算公式。结果表明：在强度等级C20～C50的范围内，珊瑚混凝土的fc,m和fsp,m分别比普通混凝土的fc,m和fsp,m高出10%～48%和9%～33%，随着强度等级的提高，两种混凝土之间的差距在减小。珊瑚混凝土的ft,m与普通混凝土的ft,m之间的差异规律与强度等级有关，较低强度等级的C30珊瑚混凝土ft,m比普通混凝土的ft,m要高4%，而较高强度等级的C55珊瑚混凝土ft,m比普通混凝土的ft,m低13%。较高强度等级的C50珊瑚混凝土fc,m、fsp,m和ft,m分别比页岩陶粒轻集料混凝土的fc,m、fsp,m和ft,m低11%、0.9%和4%。

全珊瑚骨料海水混凝土；立方体抗压强度；轴心抗压强度；劈裂抗拉强度；抗折强度

Abstract: To investigate the mechanical property of coral concrete and compare it with those of ordinary concrete and lightweight aggregate concrete, the mechanical property was measured through the experiment. The linear relationship between cube compressive strength(fcu,m) and axial compressive strength (fc,m), tensile splitting strength(fsp,m), rupture strength(ft,m) was built and relevant calculation formulas were obtained. The results show that: Between the strength grade of C20 ～ C50， thefc,mandfsp,mof the coral concrete are higher than those of ordinary concrete, which is 10%～48% and 9%～33%. With the improvement of grade, the gap between the two kinds of concrete is reducing. The difference between theft,mof coral concrete and theft,mof ordinary concrete is related to the strength grade. Theft,mof coral concrete, which is C30 of low strength grade, is higher than that of ordinary concrete, which is 4%. Theft,mof coral concrete, which is C55 of high strength grade, is lower than that of ordinary concrete, which is 13%. Thefc,m、fsp,mandft,mof coral concrete, which is C50 of high strength grade, is lower than that of haydite lightweight aggregate concrete, which is 11%、0.9% and 4%.

Keywords: coral concrete; compressive strength; axial compressive strength; tensile splitting strength; rupture strength

全珊瑚骨料海水混凝土由珊瑚、珊瑚砂、水泥、化学外加剂、矿物掺合料和海水按一定比例配合制成[1-2]。珊瑚质轻、多孔，孔隙率大，吸水性强，属于天然轻集料。作为混凝土骨料，珊瑚骨料既不同于碎石粗骨料，也不完全同于陶粒、煤矸石等轻集料，多孔的特质使其具有较高的吸水率，表面粗糙使得与水泥之间的摩擦力较大。……