In this paper, the effect and mechanism of calcareous stone powder with size less than 0.074 mm are investigated in stone chippings concrete. The results show that the stone powder can participate in hydration reactio...In this paper, the effect and mechanism of calcareous stone powder with size less than 0.074 mm are investigated in stone chippings concrete. The results show that the stone powder can participate in hydration reaction and acts as crystal nucleus in hydration process, namely, it has hydration activity to an extent. The strength of stone chippings concrete is enhanced and the easy-mixing capacity of the concrete mortar is modified when stone chippings contain a proper amount of stone powder. The stone powder has little effect on the wearability of the concrete.展开更多
以铁屑和纯Fe0为供试介质处理地下水中Cr6+,在不调节原水pH值情况下,通过室内对比试验发现铁屑比纯Fe0的去除效率高,且可使处理后水中Cr6+达到地下水质量标准的Ⅲ类标准,确定出铁屑去除Cr6+的最佳运行参数:铁屑与Cr6+的重量比为1395∶1...以铁屑和纯Fe0为供试介质处理地下水中Cr6+,在不调节原水pH值情况下,通过室内对比试验发现铁屑比纯Fe0的去除效率高,且可使处理后水中Cr6+达到地下水质量标准的Ⅲ类标准,确定出铁屑去除Cr6+的最佳运行参数:铁屑与Cr6+的重量比为1395∶1,反应时间为40 m in,并分析讨论了其去除机理。展开更多
文摘In this paper, the effect and mechanism of calcareous stone powder with size less than 0.074 mm are investigated in stone chippings concrete. The results show that the stone powder can participate in hydration reaction and acts as crystal nucleus in hydration process, namely, it has hydration activity to an extent. The strength of stone chippings concrete is enhanced and the easy-mixing capacity of the concrete mortar is modified when stone chippings contain a proper amount of stone powder. The stone powder has little effect on the wearability of the concrete.
文摘以铁屑和纯Fe0为供试介质处理地下水中Cr6+,在不调节原水pH值情况下,通过室内对比试验发现铁屑比纯Fe0的去除效率高,且可使处理后水中Cr6+达到地下水质量标准的Ⅲ类标准,确定出铁屑去除Cr6+的最佳运行参数:铁屑与Cr6+的重量比为1395∶1,反应时间为40 m in,并分析讨论了其去除机理。
