自燃煤矸石集料制备混凝土工艺研究

Study on Preparation Technology of Spontaneous Combustion Gangue Concrete

采用"普通"、"净浆裹石法"和"砂浆裹石法"3种搅拌方法,以自燃煤矸石为粗、细集料制备混凝土。通过对自燃煤矸砂与自燃煤矸石、自燃煤矸砂与天然碎石、天然河砂与自燃煤矸石和天然粗细集料4种组合集料制备的混凝土进行稠度和强度试验,考察3种不同搅拌工艺对混凝土拌合物工作性和强度的影响。结果表明,砂浆裹石法最适合天然砂石制备普通混凝土;砂浆裹石法和净浆裹石法都适合自燃煤矸砂与天然碎石制备自燃煤矸砂混凝土,净浆裹石法对后期强度的发展更有利;净浆裹石法最适合天然河砂与自燃煤矸石制备的自燃煤矸石砂轻混凝土;附加水使二次搅拌工艺对自燃煤矸砂、石制备的全煤矸石集料混凝土工作性和强度影响不明显。

Concrete was prepared by coarse and fine aggregate of spontaneous coal gangue aggregate, using the three kind of mixing technology including ＂ordinary methods＂, ＂stone enveloped with mortar＂, ＂stone enveloped with cement＂. Through testing about consistency and strength of the four groups concrete made of natural sand with natural stone, spontaneous coal gangue sand with natural stone, natural sand with spontaneous coal gangue and spontaneous coal gangue sand with spontaneous coal gangue to real the effect of the three kind of mixing technology on workability and strength of concrete mixture. The results showed that stone enveloped with mortar is the most suitable for preparation of ordinary concrete; stone enveloped with mortar and stone enveloped with cement are also suitable for preparation of spontaneous coal gangue sand concrete made by spontaneous coal gangue sand with natural stone, whereas later strength of stone enveloped with cement is better; stone enveloped with cement is the most suitable for spontaneous coal gangue sand lightweight concrete made by natural sand with spontaneous coal gangue; there is no obvious effect of mixing technology on workability and strength of spontaneous coal gangue full lightweight concrete made by spontaneous coal gangue sand with spontaneous coal gangue, because of supplementary water.