本文關(guān)鍵詞： 混凝土 珍珠巖礦砂 20-30目膨脹珍珠巖 基本力學(xué)性能　出處：《信陽(yáng)師范學(xué)院》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：近幾年,國(guó)家對(duì)建筑工業(yè)領(lǐng)域投資力度不斷加大,混凝土作為建筑工程中重要材料,需求量在不斷加大。基于可持續(xù)發(fā)展及環(huán)境保護(hù)的需求,珍珠巖復(fù)合混凝土也一直被越來(lái)越多的學(xué)者所關(guān)注,但不同種類(lèi)和粒徑的珍珠巖混凝土的研究與應(yīng)用仍不完善,珍珠巖優(yōu)異性能在更多領(lǐng)域的發(fā)展應(yīng)用是目前亟需解決的問(wèn)題。論文擬采用VHX-500掃描、XRD、XRF等微觀測(cè)試手段對(duì)珍珠巖混凝土原材料進(jìn)行研究,并通過(guò)水化熱分析研究珍珠巖混凝土的水化熱反應(yīng)情況。在大量的靜漿、砂漿試驗(yàn)基礎(chǔ)上制備出滿(mǎn)足試驗(yàn)要求的珍珠巖混凝土,然后研究珍珠巖礦砂混凝土的基本力學(xué)性能、膨脹珍珠巖混凝土的基本力學(xué)性能。通過(guò)改變珍珠巖替代砂子的種類(lèi)和替代率等參數(shù),研究其對(duì)混凝土基本力學(xué)性能的影響規(guī)律,為其在建筑工業(yè)領(lǐng)域應(yīng)用奠定基礎(chǔ)。具體研究結(jié)論如下:(1)通過(guò)對(duì)不同替代率的珍珠巖礦砂混凝土、20-30目膨脹珍珠巖混凝土的原材料微觀測(cè)試及水化熱的測(cè)試結(jié)果可以看出,隨著珍珠巖礦砂的含量的增加,混凝土內(nèi)外溫差有少量提升,珍珠巖礦砂混凝土產(chǎn)生的水化熱反應(yīng)與基準(zhǔn)混凝土的水化熱反應(yīng)基本同時(shí)間進(jìn)行。膨脹珍珠巖混凝土的水化熱反應(yīng)內(nèi)外溫度差峰值有明顯上升,水化熱峰值產(chǎn)生時(shí)間要比基本混凝土水化熱產(chǎn)生時(shí)間要提前2h左右。(2)通過(guò)對(duì)珍珠巖礦砂混凝土的基本力學(xué)性能的試驗(yàn)研究,比較不同替代率珍珠巖礦砂對(duì)混凝土的影響,得出如下結(jié)果:珍珠巖礦砂對(duì)混凝土抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、軸心抗壓強(qiáng)度的影響較大;對(duì)于混凝土的抗折強(qiáng)度和彈性模量影響較小。因此綜合試驗(yàn)結(jié)果分析,珍珠巖礦砂替代砂子的含量最好控制在30%以?xún)?nèi)。(3)通過(guò)對(duì)膨脹珍珠巖混凝土的基本力學(xué)性能的試驗(yàn)研究,分析不同替代率膨脹珍珠巖對(duì)混凝土的影響�？傮w上可以得出:膨脹珍珠巖使得混凝土抗壓強(qiáng)度、彈性模量在不斷降低。膨脹珍珠巖對(duì)于混凝土的抗折強(qiáng)度和劈裂抗拉強(qiáng)度影響較大,隨著膨脹珍珠巖含量增加,這些基本力學(xué)性能先增加后減少。綜合膨脹珍珠巖基本力學(xué)性能試驗(yàn)分析,膨脹珍珠巖替代砂子的含量最佳替代率為20%左右。研究發(fā)現(xiàn),膨脹珍珠巖混凝土基本力學(xué)性能優(yōu)于珍珠巖礦砂混凝土,另外,膨脹珍珠巖具有輕質(zhì)、保溫性好等優(yōu)點(diǎn)。因此,膨脹珍珠巖混凝土具有廣泛應(yīng)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.
【學(xué)位授予單位】：信陽(yáng)師范學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU528

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