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首页> 外文会议>National Seminar on "Application of Chemical Engineering for Utilisation of Natural Resources (CHEMINAR-2001)", Feb 16-18, 2001, Bhubaneswar >Evaluation of the Properties of Fly Ash and Its Influences on the Strength of Cement Mortar
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Evaluation of the Properties of Fly Ash and Its Influences on the Strength of Cement Mortar

机译：粉煤灰的性能评价及其对水泥砂浆强度的影响

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摘要

In the present study, properties of fly ash have been evaluated with respect to its influences on the strength giving properties of blended cement mortar. Chemical composition, fineness modulus and grain size distribution of raw fly ash were determined. It mainly contains SiO_2 and minor amount of alumina, iron oxide, lime etc. Residual carbon content of the ash is 4.6%. Standard sand mortar cubes were prepared in 1:3 ratio of cement (containing 15% fly ash) : sand. Compressive strength of the cubes were determined after 3,7 and 28 days normal curing under water and 2,4 and 8 hours of autoclaving respectively. Initial compressive strength of the mortar cubes decreases with the fly ash addition but strength increases with the duration of autoclaving. Variation of strength is mainly due to the variation of porosity and phases developed upon curing in the samples.
机译：在目前的研究中，已经评估了粉煤灰的性能对其对混合水泥砂浆强度的影响。测定了粉煤灰的化学组成，细度模量和粒度分布。它主要包含SiO_2和少量的氧化铝，氧化铁，石灰等。灰分的残余碳含量为4.6％。以水泥（含15％的粉煤灰）：沙子1：3的比例制备标准砂浆立方体。分别在水中正常固化3,7和28天以及2,4和8小时高压灭菌后，确定立方体的抗压强度。砂浆立方体的初始抗压强度随粉煤灰的添加而降低，但强度随高压灭菌时间的延长而增加。强度的变化主要是由于孔隙率的变化以及样品固化后形成的相的变化。

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