矿渣聚丙烯纤维混凝土的抗压性能

Compression of Polypropylene Fiber Reinforced Concrete Containing Slag

为研究矿渣聚丙烯纤维混凝土的抗压性能,采用Φ101.6 mm×203.2 mm圆柱型试样,应用LVDT计算机自动数据传输采集系统测试了矿渣聚丙烯纤维混凝土试样的轴心抗压强度、弹性模量和泊松比,进行了SEM电镜扫描分析。结果表明,聚丙烯纤维降低了混凝土抗压强度和弹性模量,增加了泊松比;然而,矿渣提高了混凝土的抗压强度和弹性模量;聚羧酸系超塑化剂与水泥的相容性较好;聚丙烯纤维、矿渣和聚羧酸系超塑化剂的复合效应明显。基于实验数据提出弹性模量和抗压强度之间的关系式Ec=5 103fc′0.433 3,经误差分析,适用于矿渣聚丙烯纤维混凝土。电镜扫描测试分析表明,配比不同的混凝土产生了不同形状和性能的水化物,对混凝土宏观抗压强度影响显著。

Compressive properties of concrete containing Ground Granulated Blast Furnace Slag（GGBFS） reinforced by polypropylene fibers were investigated on Φ101.6 mm×203.2 mm cylindrical specimens.Parameters under investigation were axial compressive strength,static elastic modulus,and poisson＇s ratio.The instrumentation used comprised a compression testing machine,a compressometer,bearing plates,a LVDT setup connected with a computer data acquisition system,and data transfer devices.Results showed that polypropylene fibers decrease the compressive strength and static elastic modulus but increase poission＇s ratio,while slag improves the compressive strength and static elastic modulus.The compatibility of acid polycarboxylate superplasticizer with cement is good.The Composition effects of polypropylene fibers,slag and acid polycarboxylate superplasticizer are significant.A new constitutive formulation was proposed based on experimental data,which is more suitable for polypropylene fiber reinforced concrete containing slag to describe the relationship between static elastic modulus and compressive strength.Scanning Electron Microscope（SEM） micrographs revealed that the resulted hydrated products have different morphologies,which influences the compression properties.