自燃煤矸石粗集料对混凝土强度影响的试验研究

参照国标,通过试验对辽宁省阜新市高德矿堆积的自燃煤矸石进行轻集料品质评定。在掌握了各项指标均满足国标对轻集料要求的基础上,将自燃煤矸石破碎作粗集料、普通砂作细集料、聚丙烯纤维作增韧材料,由均匀试验设计了10组自燃煤矸石轻集料混凝土试件,进行大量抗压强度、劈拉强度和抗折强度试验。研究结果表明:由于阜新高德自燃煤矸石粗集料与C40砂浆基体的强度和弹性模量相互匹配,虽然其自身强度远不及天然碎石,但因充分发挥了集料和基体的协调作用,可配制出性能优良的C40混凝土,且早期强度发展的更理想。

THE EXPERIMENT RESEARCH ON CONCRETE STRENGTH INFLUENCE OF SELF COMBUSTION COAL GANGUE COARSE AGGREGATE

It is carried out a quality assessment on lightweight aggregate of the stacked self combustion coal gangue in Gaode Mine of Fuxin in Liaoning according to the national standards.On the basis of satisfying the demands of national criterion of lightweight aggregate through all kinds of indexes,taking the crushed self combustion coal gangue as coarse aggregate,polypropylene fiber as reinforced materials,ten sets of self combustion coal gangue concrete specimens are designed by uniform test,and lots of tests of compressive strength,splitting strength and flexural strength are also carried out.The research results show that because self combustion coal gangue coarse aggregate in Gaode Mine of Fuxin matches with the strength and Yang's modulus of a matrix,and itself strength is less than natural macadam,but it sufficiently displays coordination effect between aggregate and matrix,which can produce C40 concrete with excellent property whose early stage strength develops more perfectly.