玻化微珠再生保温混凝土配合比优化设计.pdfVIP

学兔兔 2014年第4期 混凝 土与水 泥制 品 2014 No．4 4月 CHINA C0NCRETE AND CEMENT PR0DUCTS April 玻化微珠再生保温混凝土配合比优化设计 陈春红，朱平华，田 斌 (常州大学土木工程系，213164) 摘 要：考虑再生混凝土综合性能，选取再生粗、细骨料取代率、水胶比和破化微殊掺量作为关键影响因素，以 抗压强度、抗折强度、保温性能和抗冻性能作为评价指标，设计了再生混凝土配合比正交试验，并运用功效系数法进 行了分析。结果表明，水胶比对再生混凝土的抗压强度和抗冻性能影响最大；随着再生粗、细骨料取代率增大，混凝 土的力学强度下降；玻化微珠掺量的增加会降低再生混凝土的力学强度，但对其保温性能具有明显的改善作用。通 过验证试验发现，只要合理配置，可以配制28d抗压强度达到20MPa、导热系数为O．34 W／(m·K)的玻化微殊再生保 温混凝土墙体材料。 关键词：再生混凝土；配合比；优化设计；功效系数法；导热系数 Abstract：Considering the performance of recycled aggregate concrete comprehensively，four factors including re· placement rates of recycled coarse and fine aggregate，water cement ratio and glazed hollow bead content are selected as key factors，and the compressive strength，flexural strength，thermal conductivity and frost resistance are took as evaluation indices．Orthogonal tests are designed to get the optimal mix proportion，and efficacy coefficient method is used to analyze the test results．The analysis results show that compressive strength and frost resistance of the concrete are most affected by water cement ratio．Mechanical strength of the concrete is deteriorated with increasing the contents of recycled aggre— gate and glazed hollow bead，but thermal insulation property of the concrete is significantly improved．In addition，the veil- fication test results show that 28d compressive strength of the glazed hollow bead recycled insulation concrete can reach 20MPa，and its insulation resistance can achieve 0．34 W／(m·K)if it’S designed proper／y． Key word：Recycled aggregate concrete；Mix proportion；Optimization design；Efficacy coefficient method；Therm al conductivity