煤矸石细集料-水泥基材料力学性能影响的试验研究

为促进煤矸石集料在水泥混凝土中的应用,选用自燃(活性)和非自燃(非活性)煤矸石作为细集料,研究水灰比、掺量、养护制度等不同条件下两种矸石细集料-水泥基材料力学性能的发展规律,分析煤矸石的种类、活性、掺量等因素对水泥基材料力学性能的影响。试验结果表明:活性矸石作为细集料,能够在水化初期与水泥水化产物发生一定程度的二次水化反应,水化反应能提高其早期强度;非活性矸石细集料-水泥基材料的强度随水灰比的增大而减小,而活性矸石则存在合理的水灰比范围;高温养护能够促进煤矸石细集料-水泥基材料的早龄期的水化进程,提高其早期抗压强度,但28d龄期中小掺量的矸石细集料-水泥基材料的抗压强度会产生高温负效应,而对抗折强度的影响则相反。

EXPERIMENTAL RESEARCH ON THE INFLUENCE OF COAL GANGUE FINE AGGREGATE-CEMENT-BASED MATERIALS ON THE MECHANICAL PROPERTIES

The spontaneous combustion( active) and non-spontaneous combustion( inactive) two kinds of coal gangues were selected as fine aggregate to study the effect on the mechanical properties of its cement-based materials under the types of coal gangue,activity,dosage and other factors,and its mechanical properties development trend were discovered,which can provide a basis for the application of the coal gangue as aggregate. Results of the trial indicate that active coal gangue as fine aggregate had taken place the secondary hydrated reaction to a certain degree in the early hydration,hydrated reaction can promoted its early strength; inactive coal gangue-cement-based materials strength decreases with the increase in water-cement ratio,however active coal gangue exists a reasonable range. High temperature curing can promote its early hydration and its compressive strength,but at 28 d curing its compressive strength has the negative effects of high temperature with low dosage coal gangue,and an opposite effect on its flexural strength.