现浇磷石膏抗压强度的试验研究

在改性研究及工程实践基础上，对磷石膏掺入磷渣微粉、熟石灰、水泥、减水剂和缓凝剂确定了9种材料配合比，按水灰比为0.43制作了52个立方体试件和33个棱柱体试件进行抗压强度试验，还按第7种配合比制作8个比例为1/2的墙体模型进行轴心受压试验，结合前期研究结果确定现浇磷石膏的抗压强度值.结果表明,棱柱体抗压强度约为立方体抗压强度的0.8倍，墙体中的现浇磷石膏抗压强度约为棱柱体抗压强度的0.68倍，材料容重可取14.0～15.0 kN/m3.以工程实例为基础进行了可靠度分析，建议现浇磷石膏的材料分项系数取1.9，并给出了按本文材料配合比的抗压强度标准值及设计值.
On the basis of previous researches and engineering practice，total 52 cubic and 33 prismatic phosphogypsum specimens were made by a water/cement ratio of 0.43, where nine mix proportions for phosphogypsum were involved according to the different mixture of phosphorous slag micro-powder, hydrated lime, cement, water reducer and retarder. Furthermore, total 8 one-second scale wall models using the 7th mix proportion were also made for axial compression tests.Experimental results combined with the earlier research show that the compressive strength of cast-in-situ phosphogypsum wall is about 0.68 times the prism compressive strength, while the latter is about 0.8 times cube compressive strength. Additionally, the recommended value of material weight is around 14.0 kN/m3 to 15.0 kN/m3. Based on the reliability analysis of engineering examples, the material partial coefficient of cast-in-situ phosphogypsum is recommended as 1.9, and the standard value and design value of phosphogypsum compressive strength are given according to the mix proportion examined in this paper.