风积沙与粉煤灰掺量对混凝土力学性能的影响
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摘要
为了研究风积沙和粉煤灰掺量对混凝土力学性能的影响规律,通过风积沙内掺替代相同质量的河砂,替代率为0%、10%、20%、30%和40%,内掺粉煤灰为10%、20%情况下配制混凝土。对风积沙混凝土立方体抗压强度和劈裂抗拉强度进行试验研究,并采用扫描电镜(SEM)对混凝土微观结构形貌进行分析。结果表明:风积沙的掺入可以提高混凝土的抗压强度与抗拉强度,尤其对混凝土早期强度的贡献比较大;粉煤灰在风积沙混凝土后期抗压强度中发挥重要作用,对28 d抗拉强度影响较大,因此要控制其掺量;风积沙替代率20%,粉煤灰掺量10%,混凝土的力学性能表现最优。最后,建立了风积沙混凝土抗拉强度与抗压强度之间的演化方程。
In order to study the aeolian sand and fly ash content on the mechanical properties of concrete,by mixing aeolian sand instead of river sand of the same quality,replacement rate was 0%,10%,20%,30% and 40%,and to configure concrete when the fly ash was 10%,20% respectively.The cubic compressive strength and splitting tensile strength of aeolian sand concrete were studied,and using scanning electron microscopy( SEM) on the morphology of concrete microstructure analysis. The results show that the aeolian sand mixing can improve the compressive strength and tensile strength of concrete,especially on the early strength of concrete contribution to the larger. Fly ash plays an important role in the later compressive strength of aeolian sand concrete,but it has a great influence on the strength of the 28 d tensile strength,so we should control its content; aeolian sand content 20%,fly ash 10%,the mechanical performance of concrete is optimal. As a result,the evolution equation of tensile strength and compressive strength was built.
In order to study the aeolian sand and fly ash content on the mechanical properties of concrete,by mixing aeolian sand instead of river sand of the same quality,replacement rate was 0%,10%,20%,30% and 40%,and to configure concrete when the fly ash was 10%,20% respectively.The cubic compressive strength and splitting tensile strength of aeolian sand concrete were studied,and using scanning electron microscopy( SEM) on the morphology of concrete microstructure analysis. The results show that the aeolian sand mixing can improve the compressive strength and tensile strength of concrete,especially on the early strength of concrete contribution to the larger. Fly ash plays an important role in the later compressive strength of aeolian sand concrete,but it has a great influence on the strength of the 28 d tensile strength,so we should control its content; aeolian sand content 20%,fly ash 10%,the mechanical performance of concrete is optimal. As a result,the evolution equation of tensile strength and compressive strength was built.
引文
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[2]Elipe M G M,López-Querol S.Aeolian sands:Characterization,options of improvement and possible employment in construction-The State-of-theart[J].Construction&Building Materials,2014,73:728-739.
[3]张国学,宋建夏,杨维武,等.沙漠砂对水泥砂浆和混凝土性能的影响[J].宁夏大学学报(自然版),2003,24(1):63-65.
[4]朱腾明,党涛,孙卫民,等.用沙漠砂代替工程砂作基础工程材料的试验研究与应用[J].建筑科学,1997(4):26-30.
[5]董伟,申向东,林艳杰,等.风积沙的掺入对浮石轻骨料混凝土性能的影响[J].硅酸盐通报,2015,34(8):2089-2094+2106.
[6]杨维武,陈云龙,刘海峰,等.沙漠砂高强混凝土力学性能研究[J].混凝土,2014(11):100-102.
[7]付杰,杨登,刘海峰,等.粉煤灰掺量和沙漠砂替代率对高强沙漠砂混凝土力学性能影响[J].科学技术与工程,2015,15(9):230-234.
[8]鲁丽华,潘桂生,陈四利,等.不同掺量粉煤灰混凝土的强度试验[J].沈阳工业大学学报,2009,31(1):107-111.
[9]张武满,巴恒静,高小建,等.粉煤灰与应力水平对混凝土渗透性的影响[J].江苏大学学报(自然科学版),2008,29(4):356-359.
[10]赵庆新,孙伟,缪昌文.粉煤灰掺量和水胶比对高性能混凝土徐变性能的影响及其机理[J].土木工程学报,2009,42(12):76-82.
[11]张国学,杨建森.腾格里沙漠砂的工程性质试验研究[J].公路,2003(S1):131-134.
[12]武华荟.水泥—粉煤灰胶凝体系中粉煤灰强度贡献率研究[D].长沙:中南大学,2009.