海水拌合珊瑚砂混凝土轴压性能试验研究

Experimental study of axial compression performance of seawater mixed coral sand aggregate concrete

为了研究珊瑚砂混凝土基本力学性能,以细骨料取代率、拌合用水种类以及细骨料种类为变化参数,设计并制作了33个圆柱体试件,采用RMT-301岩石与混凝土力学试验系统进行单调静力加载试验,观测了珊瑚砂混凝土的破坏过程及形态,得到了加载全过程应力—应变曲线、塌落度、峰值荷载、峰值位移、位移延性以及能量耗散等特征点参数,并详细分析了各变化参数对珊瑚砂混凝土工作及力学性能影响规律,通过软件拟合得到珊瑚砂混凝土应力—应变曲线表达式。试验结果表明:珊瑚砂混凝土单轴受压破坏过程及形态与普通混凝土基本相同;拌合物峰值应力随珊瑚砂取代率增大呈现先增大后减小的趋势,取代率为70%时试件峰值应力最大;延性系数均随珊瑚骨料取代率的增大而增大;各变化参数对拌合物耗能系数无明显影响。

To study the basic mechanical properties of concrete with coral sand as fine aggregate,thirty-three cylindrical test blocks were designed,and fabricated with the fine aggregate replacement ratio,the type of mixing water and the type of fine aggregate as the variation parameters.The monotonic static loading test was carried out by RMT-301 rock and concrete mechanical test system.The failure process and morphology of coral sand concrete were observed.The complete stress-strain curve,slump,peak load,peak displacement were obtained.Characteristic parameters such as ductility and energy dissipation,and the influence of various parameters on the work and mechanical properties of coral sand concrete were analyzed in detail,and the stress-strain curve expression of coral sand concrete was obtained by software fitting.The test results show that the uniaxial compression failure process and morphology of coral sand concrete was basically the same as that of ordinary concrete.The peak stress of the mixture increases first and then decreases with the increase of the coral sand substitution ratio.The peak stress of the specimen was the largest when the substitution ratio was 70%.The ductility coefficient increased with the increase of the coral aggregate replacement ratio.There was no significant effect on the energy consumption coefficient of the concrete.