【摘要】 采用常规原材料和工业废渣 ,普通成型工艺 ,通过正交设计试验研究 ,配制出了抗压强度为 1 5 0 MPa的超高强水泥基材料 ,并给出了优选配比。超高强水泥基材料强度试验的极差和方差分析表明 :水胶比为影响超高强水泥基材料强度的最显著因素 ,硅灰和不锈钢纤维渣的掺量以及胶砂比也有十分显著的影响。更多还原

【Abstract】 Having failed to find detailed information about ultra-high-strength cement-based composites in the open literature, we are, to the best of our knowledge, the first in China to design and implement 150 MPa ultra-high-strength cement-based composites. Subsection 1.1 reviews known modern concepts about designing ultra-high-strength cement-based composites and points out with emphasis the high advisability of reducing content of Ca(OH) 2. We investigated ultra-high-strength cement-based composites using ordinary materials and normal mixing method. We employed orthogonal test design to obtain an ultra-high-strength material whose compressive strength exceeds 150 MPa by using Ordinary Portland Cement (OPC), superfine powder, silica fume, stainless steel fibre bits, superplasticizers and natural sand. Our investigation shows that the water/binder ratio used is the most significant factor for controlling material strength. We achieved more than 150 MPa with a water/binder ratio of 0.20. We recommend mix proportions for 150 MPa ultra-high-strength cement-based material as follows: water/binder ratio 0.20; silica fume/cement ratio 0.20; superfine powder/cement ratio 0.15, stainless steel fibre bits/cement ratio 0.03, sand/binder ratio 1.0; dosage of superplasticizers 1.5% by mass of cement and silica fume.更多还原