矿物掺合料对恒负温养护条件下水泥基材料性能的影响研究

发布时间：2020-12-09 17:43

　　冬季施工中,混凝土容易遭受低温的影响,往往造成不可恢复性的损伤;同时,耐久性也有很大程度上的损失。用粉煤灰、硅灰替代混凝土中的部分水泥,不仅可以促进工业废料循环再利用,还可以改善混凝土的部分性能,这已成为工程中的常规方法。但这种方法在负温混凝土中的应用研究却较为少见,尤其是恒负温条件下。本文研究了不同恒负温养护条件下掺合料种类和掺量对水泥基材料的强度、耐久性与孔结构的影响。试验结果表明,受冻温度对水泥基材料的性能有较大影响,其强度与抗气体渗透性能随受冻温度降低而降低。尤其在-20℃下性能增长缓慢甚至随龄期增加而降低,应避免在过低负温下进行施工作业。硅灰掺合料对改善恒负温养护条件下水泥基材料的早期强度、气体渗透性、孔隙分布等方面均有良好的作用,其中气体渗透性与孔隙分布随掺量增加而优化,但强度随掺量提高变化不大;而粉煤灰掺合料对水泥基材料的各方面性能随掺量增加有一定程度的劣化,应谨慎确定合适掺量后再使用。 

【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校

【文章页数】：53 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Chapter 1
    1.1 Research background
    1.2 Research at home and abroad
        1.2.1 Research at abroad
        1.2.2 Research at home
    1.3 Analysis of literature review
Chapter 2.Study on strength of frozen cement-based materials at constant low-temperature
    2.1 Introduction
    2.2 Test materials
        2.2.1 Cement
        2.2.2 Admixtures
    2.3 Forming cement paste specimens and mechanical performance testmethod
    2.4 Experiment plan
        2.4.1 Freezing temperature
        2.4.2 Age of specimen
        2.4.3 Admixtures
        2.4.4 Speciment size and quantity
    2.5 Effects of age on the strength
        2.5.1 Silica fume admixture
        2.5.2 Fly ash admixture
    2.6 Effect of admixture on the strength
        2.6.1 Silica fume admixture
        2.6.2 Fly ash admixture
    2.7 Chapter summary
Chapter 3 Study on durability of frozen cement-based materials at low-temperature
    3.1 Introduction
    3.2 Experiment plan
        3.2.1 Cement paste specimens
        3.2.2 Gas permeability
        3.2.3 Gas permeability test method
    3.3 Effect of age on gas permeability
        3.3.1 Silica fume admixture
        3.3.2 Fly ash admixture
    3.4 Effect of admixture on the strength
        3.4.1 Silica fume admixture
        3.4.2 Fly ash admixture
    3.5 Chapter summary
Chapter 4 Study on pore structure of frozen cement-based materials at constant low-temperature
    4.1 Introduction
    4.2 Pore structure test method
    4.3 Experimental plan
        4.3.1 Freezing tempreture
        4.3.2 Age of specimen
        4.3.3 Admixture
        4.3.4 Specimen size and quality
    4.4 Pore structure analisys of cement-based materials
        4.4.1 Effect of admixture on pure structure
        4.4.2 Effect of age on pure structure
    4.5 Chapter summary
Chapter 5 Processing data by using a meta-analysis
    5.1 Introduction
    5.2 Analysis of study on strength data
    5.3 Analysis of study on durability data
    5.4 Analysis of study on pore structure data
    5.5 Chapter summary
Conclusion
References
Acknowledgements
Resume



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