一种有机外加剂对高含泥机制砂混凝土工作性及力学性能试验研究
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摘要
研究了一种有机外加剂对高含泥机制砂混凝土的工作性及力学性能的影响。试验结果表明:提高减水剂中的保坍组分不能有效降低混凝土经时损失;提高缓凝组分有助于缓解混凝土经时损失,但其效果并不明显,且会明显增加混凝土凝结时间。通过掺入有机外加剂既可以显著降低高含泥机制砂混凝土的经时损失,又可以提高混凝土28 d抗压强度4%～10%,且对凝结时间影响较小,同时合理调整外加剂中的减水、保坍组分比例,更有利于发挥其作用效果。此外,该机制砂混凝土的耐久性还需进一步研究。
The effect of an organic additive on the workability and mechanical properties of manufacture sand concrete with high clay content is mainly studied. The results show that the increase of water reducing agent cann't effectively reduce concrete fluidity loss. The improvement of retarders is limited advantage to the workability of concrete, and it will obviously increase the setting time of the concrete. The addition of organic additive can not only significantly reduce the fluidity loss of concrete with high slag content of manufacture sand, but also increase the 28 d compressive strength of the concrete by 4%～10%, and has little effect on the setting time. At the same time, it is more beneficial to adjust the proportion of water reduction and slumping components in admixture. In addition, the durability of the mechanism of sand concrete with high content of clay needs further study.
The effect of an organic additive on the workability and mechanical properties of manufacture sand concrete with high clay content is mainly studied. The results show that the increase of water reducing agent cann't effectively reduce concrete fluidity loss. The improvement of retarders is limited advantage to the workability of concrete, and it will obviously increase the setting time of the concrete. The addition of organic additive can not only significantly reduce the fluidity loss of concrete with high slag content of manufacture sand, but also increase the 28 d compressive strength of the concrete by 4%～10%, and has little effect on the setting time. At the same time, it is more beneficial to adjust the proportion of water reduction and slumping components in admixture. In addition, the durability of the mechanism of sand concrete with high content of clay needs further study.
引文
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[5]王军,赵日煦,陈耀丽,等.砂石质量的差异对混凝土性能及其经济性的影响[J].混凝土,2010(1):97-99.
[6]王方刚,郭飞,陆加越,等.低品质砂对聚羧酸减水剂性能影响及改善措施研究[J].混凝土与水泥制品,2016(1):18-22.
[7]罗金连,黄小灵.砂石含泥量对聚羧酸高性能减水剂性能的影响[J].内蒙古师范大学学报:自然科学汉文版,2016,45(3):369-372.
[8]赵少鹏,陆加越,王方刚,李炜.劣质砂对应用聚羧酸减水剂混凝土性能的影响[J].混凝土与水泥制品,2016(11):21-24.
[9]蔡心映.含泥量对聚羧酸减水剂性能的影响研究[J].广东建材,2016,32(9):22-28.
[10]钟志强.助剂改善聚羧酸减水剂抗泥性能研究[D].重庆:重庆大学,2016.
[11]邢国兵.抗黏土型减水剂的制备及其与黏土相互作用机理研究[D].合肥:合肥工业大学,2017.
[12]陈国新,祝烨然,沈燕萍,等.抗泥型聚羧酸系外加剂的合成及性能研究[J].混凝土,2014(4):87-89.
[13]熊锃,张平,王琴,等.一种抗泥型聚羧酸系减水剂的制备及性能研究[J].混凝土世界,2017(6):86-88.
[14]巨浩波.砂石含泥量对聚羧酸系减水剂性能的影响及外加剂的合成研究[D].西安:陕西科技大学,2014.
[15]黎锦霞,张炜,梁晓彤,等.季铵盐型外加剂的合成及其性能研究[J].广东建材,2016,32(2)18-20.
[16]陈新秀.聚羧酸减水剂用外加剂的研究[J].福建建材,2017(3):5-7.
[17]安格尔.复配聚羧酸系减水剂对混凝土性能的影响[D].南昌:南昌航空大学,2014.
[18]黄刚.缓凝剂和早期养护对混凝土性能的影响[D].重庆:重庆大学,2001.