现浇磷石膏抗压强度的试验研究

摘要

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,hy-drated 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.Additional-ly,the recommended value of material weight is around 14.0 kN/m3 to 15.0 kN/m3 .Based on the reliabil-ity analysis of engineering examples,the material partial coefficient of cast-in-situ phosphogypsum is rec-ommended 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.%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．