Effects of fly ash fineness on the mechanical properties of concrete
Effects of fly ash fineness on the mechanical properties of concrete
复制标题
粉煤灰细度对混凝土力学性能的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
H. S. Arel
中科院分区：
文献类型：
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作者：
Ş. Yazıcı;H. S. Arel
本文综述了粉煤灰细度对混凝土抗压强度和劈裂抗拉强度的影响。在球磨机中研磨布莱恩细度为2351 cm 2/g的褐煤来源的飞灰。作为研磨过程的结果，获得细度为3849 cm 2/g和5239 cm 2/g的粉煤灰。用3种不同细度的粉煤灰分别代替0%、5%、10%和15%的水泥配制了10种不同的混凝土拌合物。在混凝土混合物中，粘合剂的用量和水/水泥比分别固定为350 kg/m3和0.50。混凝土的坍落度值调整为100 ± 20 mm。铸造具有100 mm边缘的立方体样品。将试样在20°C的水中固化。养护结束后，测定了7、28、56、90、120和180 d混凝土试件的抗压强度和劈拉强度，发现粉煤灰细度对混凝土抗压强度和劈拉强度有短期和长期的影响。结果表明，混凝土的抗压强度和抗拉强度随粉煤灰细度的增加而增加。研究表明，粉煤灰的布莱恩细度值应大于3849 cm 2/g细度，才能对混凝土的力学性能产生积极影响。粉煤灰细度对混凝土抗压强度和劈裂抗拉强度的影响在FAC规范细度为5235 cm 2/g的粉煤灰中最为显著。
The present study reviews the effects of fly ash fineness on the compressive and splitting tensile strength of the concretes. A fly ash of lignite origin with Blaine fineness of 2351 cm2/g was ground in a ball mill. As a consequence of the grinding process, fly ashes with fineness of 3849 cm2/g and 5239 cm2/g were obtained. Fly ashes with three different fineness were used instead of cement of 0%, 5%, 10%, and 15% and ten different types of concrete mixture were produced. In the concrete mixtures, the dosage of binder and water/cement ratio were fixed at 350 kg/m3 and 0.50, respectively. Slump values for the concretes were adjusted to be 100 ± 20 mm. Cubic samples were cast with edges of 100 mm. The specimens were cured in water at 20°C. At the end of curing process, compressive and splitting tensile strengths of the concrete samples were determined at 7, 28, 56, 90, 120 and 180 days.It was observed that compressive and splitting tensile strength of the concretes was affected by fineness of fly ash in short-and long-terms. It was found that compressive and tensile strength of the concretes increased as fly ash fineness increased. It was concluded that Blaine fineness value should be above 3849 cm2/g fineness of fly ash to have positive impact on mechanical properties of concrete. The effects of fly ash fineness on the compressive and splitting tensile strength of the concretes were remarkably seen in the fly ash with FAC code with fineness of 5235 cm2/g.