粉煤灰对海水海砂混凝土力学性能和耐海水冻融性的影响研究

Jingjing He, Chuanwu Sun, Xuezhi Wang
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摘要

在使用海水和海砂作为混合物时,由于原材料本身含有有害离子,混凝土的机械性能和耐久性会受到不利影响。粉煤灰是工业生产过程中形成的尾矿,使用粉煤灰不需要焚烧熟料,从而减少了二氧化碳的排放。此外,粉煤灰属于低排放、高环保的新型胶凝材料。粉煤灰可以提高混凝土的性能,减少有害离子对混凝土的影响。基于上述考虑,以粉煤灰掺量为主要变量,制备了相应的试件,并对其进行了立方体抗压强度、抗折强度和抗海水冻融试验。采用宏观分析和微观分析相结合的方法研究了粉煤灰对海水海砂混凝土性能的影响。结果表明,粉煤灰显著提高了海水海砂混凝土的力学性能和抗海水冻融性。在替代率为 20% 时,抗压强度和抗海水冻融性的改善效果最好。抗压强度的最大增幅为 13.22%。试样经受 75 次海水冻融后,质量损失率最大降低了 57.26%,强度损失率最大降低了 43.14%。当替代率为 10%时,抗弯强度最大提高了 17.06%。通过微观分析可以看出,煤灰的掺入可以通过微集料效应以及火山灰反应促进二次水化反应来提高混凝土的密实性,从而增强海水海砂混凝土的耐海水冻融性能。最后,利用灰色系统理论的平均 GM(1,1)模型建立的损伤预测模型满足一级预测精度的要求,可以准确预测海水海砂混凝土在海水冻融作用下的损伤。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the Effect of Fly Ash on Mechanical Properties and Seawater Freeze–Thaw Resistance of Seawater Sea Sand Concrete
When using seawater and sea sand as mixes, the mechanical properties and durability of concrete are adversely affected because the raw materials themselves contain harmful ions. Fly ash is the tailings formed in the process of industrial production, the use of which does not require the burning of clinker, reducing CO2 emissions. Moreover, it belongs to a new type of cementitious materials with low emissions and high environmental protection. Fly ash enhances the properties of concrete and reduces the effect of harmful ions on concrete. Based on the above considerations, the corresponding specimens were prepared and subjected to cubic compressive strength, flexural strength, and seawater freezing and thawing resistance tests by using fly ash admixture as the main variable. A combination of macro-analysis and micro-analysis was used to investigate the effect of fly ash on the performance of seawater sea sand concrete. The results showed that fly ash significantly enhanced the mechanical properties and resistance to seawater freezing and thawing of seawater sea sand concrete. The best improvement in compressive strength and resistance to seawater freezing and thawing was achieved at a substitution rate of 20%. The maximum increase in compressive strength was 13.22%. The maximum reduction in mass loss rate was 57.26% and the strength loss rate was 43.14% after the specimens were subjected to seawater freezing and thawing 75 times. The maximum enhancement in flexural strength was 17.06% for a substitution rate of 10%. Through microanalysis, it can be seen that the incorporation of coal ash can enhance the compactness of concrete through the microaggregate effect as well as the volcanic ash reaction to promote the secondary hydration reaction, so as to strengthen the seawater freeze–thaw resistance of seawater sea sand concrete. Finally, the damage prediction model established using the mean GM (1, 1) model of gray system theory meets the requirements of the first level of prediction accuracy and can accurately predict the damage of seawater sea sand concrete under seawater freezing and thawing.
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