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Effect of ultrafine fly ash on the properties of concretes containing construction and demolition wastes as coarse aggregates

机译：超细粉煤灰对含有建筑和拆除废物的粗骨料混凝土性能的影响

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摘要

This paper presents the preliminary results of the effect of ultrafine fly ash (UFFA) on the properties of concretes containing recycled coarse aggregates (RCA) originating from construction and demolition (C&D) wastes. The effect of 10 % UFFA on the compressive strength, tensile strength, sorptivity and chloride ion permeability of concretes containing 25 and 50 % RCA is evaluated at 7, 28 and 56 days. The addition of UFFA increased the compressive strength of recycled aggregate concretes at all ages up to 56 days. However, a slight reduction in the tensile strength of recycled aggregate concretes was observed. Concrete containing 25 % RCA and 10 % UFFA achieved 94 % of the control concrete's compressive strength at 56 days. In both recycled aggregate concretes tested, the sorptivity and chloride ion permeability are much lower at all ages due to the addition of 10 % UFFA. This is because it serves to promote hydration and block the large capillary pores within the concrete.
机译：本文介绍了超细粉煤灰（UFFA）对包含源自建筑和拆除（C＆D）废物的再生粗骨料（RCA）的混凝土性能的初步结果。在7、28和56天评估了10％UFFA对包含25％和50％RCA的混凝土的抗压强度，抗张强度，吸收性和氯离子渗透性的影响。 UFFA的添加提高了再生骨料混凝土在长达56天的所有龄期的抗压强度。但是，观察到再生骨料混凝土的抗拉强度略有降低。含有25％RCA和10％UFFA的混凝土在56天时达到了对照混凝土抗压强度的94％。在两种测试的再生骨料混凝土中，由于添加了10％UFFA，在所有年龄段的吸水性和氯离子渗透性都大大降低。这是因为它可以促进水合作用并阻塞混凝土中的大毛细孔。

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