Drying shrinkage of fibre-reinforced lightweight aggregate concrete containing fly ash
Drying shrinkage of fibre-reinforced lightweight aggregate concrete containing fly ash
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DOI：
10.1016/s0008-8846(99)00179-9
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发表时间：
1999-11-01
影响因子：
11.4
通讯作者：
Zhu, B
中科院分区：
文献类型：
--
作者：
Kayali, O;Haque, MN;Zhu, B
生产了抗压强度在61至67 MPa之间的含有粉煤灰的轻骨料混凝土。轻骨料;使用的是烧结粉煤灰。混凝土用聚丙烯或钢纤维增强。纤维不影响抗压强度，但增加了这些混凝土的抗拉强度。测试的所有轻质混凝土的弹性模量约为21 GPa，而正常重量混凝土的弹性模量为35 GPa。纤维增强不影响弹性模量的值。这种类型的轻质混凝土，含有粉煤灰作为总胶凝材料含量的23%，导致长期收缩，几乎是正常重量混凝土的两倍：强度。聚丙烯纤维增强没有减少干燥收缩，而钢纤维。这种类型的轻质混凝土的早期收缩行为是类似于正常重量的混凝土。然而，轻质混凝土的收缩率保持恒定，直到干燥近100天。这与正常重量的混凝土不同，后者在56天后明显放缓。收缩：正常重量的混凝土在400天后稳定，而轻质混凝土的收缩在类似的连续干燥时间后似乎并不稳定。(C)1999 Elsevier Science Ltd.保留所有权利。
Lightweight aggregate concretes containing fly ash with a compressive strength between 61 to 67 MPa were produced. The lightweight aggregate; used was sintered fly ash. The concretes were reinforced with tither polypropylene or steel fibres. The fibres did not affect the compressive strength, but did increase the tensile strength of these concretes. The modulus of elasticity of all the lightweight concretes tested was about 21 GPa, compared to 35 GPa for the normal-weight concrete. Fibre reinforcement did not affect the value of the elastic modulus. This type of lightweight concrete, containing fly ash as 23% of the total cementitious content, resulted in long-term shrinkage that is nearly twice as large as normal-weight concrete of somewhat similar:strength. Polypropylene fibre reinforcement did not reduce drying shrinkage, while steel fibres did. Early shrinkage behaviour of this type of lightweight concrete was similar to normal-weight concrete. However, the rate of shrinkage of the lightweight concrete remained constant until nearly 100 days of drying. This is different from normal-weight concrete that slowed appreciably after 56 days. Shrinkage :of:normal-weight concrete stabilised after 400 days, while shrinkage of lightweight concrete did not appear to stabilise after a similar period of continuous drying. (C) 1999 Elsevier Science Ltd. All rights reserved.