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首页> 外文期刊>Materials and structures >Internal curing of Class-F fly-ash concrete using high-volume roof-tile waste aggregate
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Internal curing of Class-F fly-ash concrete using high-volume roof-tile waste aggregate

机译：使用大量屋顶瓦废料骨料对F级粉煤灰混凝土进行内部养护

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摘要

The aim of this study was to investigate the effect of a high volume of roof-tile waste coarse aggregate (5-13 mm) as an internal curing agent on the compressive strength, modulus of elasticity, pore structure, and hydration and pozzolanic reactions in paste of fly-ash concrete with a low water-to-binder ratio of 0.30. The fly-ash concrete specimens in which the replacement ratio of cement by Class-F fly ash was 40% by mass and that of normal coarse aggregate by roof-tile waste aggregate was 40% by volume, were cured up to 728 days. Internal curing with roof-tile waste aggregate increased the compressive strength of the fly-ash concrete by 8.4-16.5% and decreased the modulus of elasticity by 4.9-12.8%. The use of a high volume of waste aggregate decreased the volume of the capillary pores in the 0.01-10 mu m range and the volume proportion of the 0.02-0.33-mu m pores after 28 days, but increased the volume proportion of 0.003-0.02-mu m pores slightly at 7 days and significantly up to 728 days, and the consumption of Ca(OH)(2) in the fly-ash concrete. This roof-tile waste aggregate can be used as an internal water reservoir to increase the compressive strength and to improve the pore structure of concrete with a high-volume (40%) replacement of Class-F fly ash.
机译：这项研究的目的是研究大量的屋顶瓦片废料粗骨料（5-13毫米）作为内部固化剂对混凝土中抗压强度，弹性模量，孔结构以及水合和火山灰反应的影响。水灰比低至0.30的粉煤灰混凝土浆。 F级粉煤灰的水泥替代率为40质量％，普通粗骨料为屋顶瓦废骨料的替代率为40％（体积）的粉煤灰混凝土样品可固化至728天。屋顶瓦砾骨料的内部养护使粉煤灰混凝土的抗压强度提高了8.4-16.5％，而弹性模量降低了4.9-12.8％。 28天后，使用大量的废料会减少0.01-10微米范围内的毛细孔的体积和0.02-0.33微米的毛孔的体积比例，但会增加0.003-0.02的体积比例-μm的孔在第7天出现微孔，并且明显延长到728天，并且粉煤灰混凝土中的Ca（OH）（2）消耗量。这种屋顶瓦废料骨料可以用作内部蓄水池，以大体积（40％）替代F级粉煤灰来提高抗压强度并改善混凝土的孔隙结构。

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