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将云南磷石膏脱水筛分后水化造粒制成多孔集料,再与425水泥、砂和水混合配制成混凝土,研究了集料包壳、减水剂和养护方式对混凝土强度的影响。结果显示,集料不包壳、不加减水剂和采用湿养护,混凝土的抗压强度为5.17 MPa,可用作非承重墙体材料;用325水泥对磷石膏集料进行1∶4包壳处理,加2%聚羧酸减水剂,采用干养护,混凝土的抗压强度可提高至17.32 MPa,达到了承重墙抗压强度≥10 MPa的国家标准,可替代黏土砖用作承重墙体材料。
Yunnan phosphogypsum was dehydrated, sieved, hydrated and granulated to make porous aggregates, then mixed with 425 cement, sand and water to prepare concrete. The effects of aggregates, water reducing agent and curing methods on concrete strength were studied. The results show that the aggregate does not enclose the shell, without water-reducing agent and wet curing. The compressive strength of concrete is 5.17 MPa and can be used as non-load-bearing wall material. Shell treatment, plus 2% polycarboxylate superplasticizer, the use of dry curing, the compressive strength of concrete can be increased to 17.32 MPa, reached the compressive strength of the load-bearing wall ≥ 10 MPa national standards, as an alternative to load-bearing walls of clay bricks Body material.