珍珠岩混凝土基本力学性能的试验研究

发布时间：2018-02-27 07:57

本文关键词： 混凝土珍珠岩矿砂 20-30目膨胀珍珠岩基本力学性能　出处：《信阳师范学院》2017年硕士论文　论文类型：学位论文

【摘要】：近几年,国家对建筑工业领域投资力度不断加大,混凝土作为建筑工程中重要材料,需求量在不断加大。基于可持续发展及环境保护的需求,珍珠岩复合混凝土也一直被越来越多的学者所关注,但不同种类和粒径的珍珠岩混凝土的研究与应用仍不完善,珍珠岩优异性能在更多领域的发展应用是目前亟需解决的问题。论文拟采用VHX-500扫描、XRD、XRF等微观测试手段对珍珠岩混凝土原材料进行研究,并通过水化热分析研究珍珠岩混凝土的水化热反应情况。在大量的静浆、砂浆试验基础上制备出满足试验要求的珍珠岩混凝土,然后研究珍珠岩矿砂混凝土的基本力学性能、膨胀珍珠岩混凝土的基本力学性能。通过改变珍珠岩替代砂子的种类和替代率等参数,研究其对混凝土基本力学性能的影响规律,为其在建筑工业领域应用奠定基础。具体研究结论如下:(1)通过对不同替代率的珍珠岩矿砂混凝土、20-30目膨胀珍珠岩混凝土的原材料微观测试及水化热的测试结果可以看出,随着珍珠岩矿砂的含量的增加,混凝土内外温差有少量提升,珍珠岩矿砂混凝土产生的水化热反应与基准混凝土的水化热反应基本同时间进行。膨胀珍珠岩混凝土的水化热反应内外温度差峰值有明显上升,水化热峰值产生时间要比基本混凝土水化热产生时间要提前2h左右。(2)通过对珍珠岩矿砂混凝土的基本力学性能的试验研究,比较不同替代率珍珠岩矿砂对混凝土的影响,得出如下结果:珍珠岩矿砂对混凝土抗压强度、劈裂抗拉强度、轴心抗压强度的影响较大;对于混凝土的抗折强度和弹性模量影响较小。因此综合试验结果分析,珍珠岩矿砂替代砂子的含量最好控制在30%以内。(3)通过对膨胀珍珠岩混凝土的基本力学性能的试验研究,分析不同替代率膨胀珍珠岩对混凝土的影响。总体上可以得出:膨胀珍珠岩使得混凝土抗压强度、弹性模量在不断降低。膨胀珍珠岩对于混凝土的抗折强度和劈裂抗拉强度影响较大,随着膨胀珍珠岩含量增加,这些基本力学性能先增加后减少。综合膨胀珍珠岩基本力学性能试验分析,膨胀珍珠岩替代砂子的含量最佳替代率为20%左右。研究发现,膨胀珍珠岩混凝土基本力学性能优于珍珠岩矿砂混凝土,另外,膨胀珍珠岩具有轻质、保温性好等优点。因此,膨胀珍珠岩混凝土具有广泛应用前景。
[Abstract]:In recent years, the national investment in the field of construction industry has been increasing, and the demand for concrete, as an important material in construction engineering, has been increasing. Based on the needs of sustainable development and environmental protection, Perlite composite concrete has been concerned by more and more scholars, but the research and application of perlite concrete of different types and sizes are still not perfect. The development and application of perlite excellent properties in more fields is an urgent problem to be solved at present. This paper intends to study the raw materials of perlite concrete by means of VHX-500 scanning XRDX XRF and other microcosmic testing methods. The hydration thermal reaction of perlite concrete was studied by hydration heat analysis. On the basis of a large number of static mortar and mortar tests, the perlite concrete satisfying the test requirements was prepared, and the basic mechanical properties of perlite sand concrete were studied. The basic mechanical properties of expanded perlite concrete are studied by changing the parameters such as the type and replacement rate of perlite instead of sand, and studying the influence of perlite on the basic mechanical properties of concrete. The concrete conclusions are as follows: (1) through the microscopic testing of the raw materials and the hydration heat of the perlite concrete with different substitution rates, the material of the expanded perlite concrete of 20-30 mesh can be seen. With the increase of the content of perlite sand, the temperature difference inside and outside the concrete increases slightly. The hydration heat reaction produced by perlite sand concrete is basically at the same time as that of reference concrete. The peak value of temperature difference inside and outside hydration of expanded perlite concrete increases obviously. The peak time of hydration heat is about 2 hours ahead of the time of basic concrete hydration heat. Through the experimental study on the basic mechanical properties of perlite sand concrete, the effects of perlite ore with different substitution rates on concrete are compared. The results are as follows: perlite sand has great influence on the compressive strength, splitting tensile strength and axial compressive strength of concrete, and has little effect on the flexural strength and elastic modulus of concrete. The content of perlite sand instead of sand should be controlled within 30%.) the basic mechanical properties of expanded perlite concrete are studied experimentally. The influence of expanded perlite with different substitution rates on concrete is analyzed. Generally speaking, it can be concluded that expanded perlite makes concrete compressive strength. The modulus of elasticity is decreasing continuously. Expanded perlite has a great influence on the flexural strength and splitting tensile strength of concrete, and increases with the content of expanded perlite. These basic mechanical properties are increased first and then decreased. The optimum substitution rate of the content of expanded perlite for sand is about 20%, according to the test and analysis of the basic mechanical properties of expanded perlite. The basic mechanical properties of expanded perlite concrete are better than those of perlite sand concrete. In addition, expanded perlite has the advantages of light weight and good temperature preservation. Therefore, expansive perlite concrete has a broad application prospect.
【学位授予单位】：信阳师范学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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