煤矸石理化性质对混凝土抗压强度的影响
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摘要
为研究不同地层的煤矸石物理化学性能及其骨料取代率对煤矸石混凝土力学性能的影响,通过X射线衍射(XRD)、骨料压碎指标、混凝土强度等试验研究了不同地层的煤矸石化学成分、压碎指标及骨料取代率(0、30%、60%与100%)等因素对煤矸石混凝土抗压强度的影响。结果表明:随着煤矸石粗骨料取代率的增加,混凝土的压强度明显降低,细骨料取代则无明显规律;不同地层的煤矸石压碎指标和化学成分相差较大,骨料的压碎指标越小,相应混凝土的抗压强度越高;SiO_2、Al_2O_3、Ca O含量相对较高,Fe_2O_3含量相对低的煤矸石更适合做混凝土的骨料。研究结果可为分类利用煤矸石,提高其资源化利用率提供参考。
To study the effect of physical and chemical properties of coal gangue under different strata and the replacement ratio of aggregate on mechanical properties of coal gangue concrete,X-ray diffraction(XRD)test,aggregate crushing rate test and concrete compressive strength test were used to determine the effects of chemical composition,crushing rate and aggregate replacement ratio(0,30%,60%and 100%)on the mechanical properties of coal gangue concrete.The results show that with the increase of coal gangue coarse aggregate replacement rate,the compressive strength of concrete decreased obviously at 28 days,but there was no obvious regularity in fine aggregate replacement;the crushing rate and chemical composition content of coal gangue in different stratas are quite different:the smaller the crushing rate of aggregate is,the higher the compressive strength on 28d of concrete is,and coal gangue with a relatively high content of SiO_2,Al_2O_3 and CaO and a relatively low content of Fe_2O_3 is more suitable for concrete aggregate.The research results provide a reference for the classification utilization of coal gangue and to improve its resource utilization.
To study the effect of physical and chemical properties of coal gangue under different strata and the replacement ratio of aggregate on mechanical properties of coal gangue concrete,X-ray diffraction(XRD)test,aggregate crushing rate test and concrete compressive strength test were used to determine the effects of chemical composition,crushing rate and aggregate replacement ratio(0,30%,60%and 100%)on the mechanical properties of coal gangue concrete.The results show that with the increase of coal gangue coarse aggregate replacement rate,the compressive strength of concrete decreased obviously at 28 days,but there was no obvious regularity in fine aggregate replacement;the crushing rate and chemical composition content of coal gangue in different stratas are quite different:the smaller the crushing rate of aggregate is,the higher the compressive strength on 28d of concrete is,and coal gangue with a relatively high content of SiO_2,Al_2O_3 and CaO and a relatively low content of Fe_2O_3 is more suitable for concrete aggregate.The research results provide a reference for the classification utilization of coal gangue and to improve its resource utilization.
引文
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[2]杨凯,文雪琴.自燃后煤矸石的XRD定性分析[J].煤炭技术,2017,36(1):313-314.
[3]宋洋,赵禹,祝百茹.煤矸石轻集料混凝土性能试验研究[J].非金属矿,2014,37(1):28-30.
[4]ZHANG J,FUJIWARA T.Resistance to frost damage of concrete with various mix proportions under salty condition[C]//Frost Resistance of Concrete-From Nano-Structure and Pore Solution to Macroscopic Behavior and Testing.Essen Germany:International Union of Testing and Research Laboratories for Materials and Structures,2002:367-374.
[5]董作超.煤矸石集料混凝土的力学性能与抗碳化试验研究[D].徐州:中国矿业大学,2016.
[6]田晓利,薛群虎,薛崇勃,等.两种煤矸石理化性能研究及应用[J].非金属矿,2009,32(2):33-35.DeDe