本文關(guān)鍵詞： 混凝土 礦物摻合料 力學(xué)性能 相對(duì)濕度 收縮抗裂性能　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著混凝土越來越廣泛的應(yīng)用于工程領(lǐng)域,但是隨之而來的結(jié)構(gòu)早期開裂問題也越來越嚴(yán)重。混凝土早期開裂問題已經(jīng)成為導(dǎo)致混凝土結(jié)構(gòu)性能劣化、影響其耐久性的重要原因。特別是當(dāng)今大規(guī)模發(fā)展的高速公路隧道混凝土工程中存在著大量的早期開裂現(xiàn)象,已嚴(yán)重影響到了國民經(jīng)濟(jì)的快速發(fā)展。因此,配制具有良好和易性和抗裂性能的復(fù)摻礦物摻合料混凝土,從試驗(yàn)和理論綜合研究與混凝土開裂相關(guān)問題,對(duì)于提高混凝土工程耐久性,保證混凝土工程的質(zhì)量與安全具有重要意義。本文以此為主線,主要的研究工作如下： 1.混凝土實(shí)際工程中,由于原材料來源不穩(wěn)定,給混凝土的質(zhì)量控制帶來了嚴(yán)重的影響。從混凝土生命周期的源頭出發(fā),研究了水泥類型、砂的細(xì)度模數(shù)對(duì)混凝土工作性能和基本力學(xué)性能的影響,對(duì)復(fù)摻礦物摻合料混凝土的基本力學(xué)性能也進(jìn)行了長達(dá)360d的測試,研究混凝土基本力學(xué)性能隨齡期的發(fā)展規(guī)律及其相互之間的關(guān)系,在抗壓強(qiáng)度預(yù)測公式中考慮了混凝土抗壓強(qiáng)度隨齡期的發(fā)展速率的影響,在研究抗壓強(qiáng)度與劈裂抗拉強(qiáng)度關(guān)系考慮混凝土齡期對(duì)兩者的影響。 2.通過試驗(yàn)研究了水泥類型、砂的細(xì)度模數(shù)對(duì)混凝土抗?jié)B性能、自由收縮性能、開裂性能的影響,并據(jù)此綜合評(píng)價(jià)了不同配合比混凝土耐久性能和收縮抗裂性能的差異。 3.通過對(duì)比復(fù)摻礦物摻合料混凝土與基準(zhǔn)配合比混凝土性能,得到在混凝土中復(fù)摻適量的礦物摻合料,可以改善混凝土的后期力學(xué)性能,抗?jié)B性能以及收縮開裂性能。 4.從影響混凝土的開裂因素的研究入手,綜合分析混凝土的力學(xué)性能、溫度變形、收縮等因素對(duì)混凝土開裂的影響,建立了非荷載作用下混凝土的開裂風(fēng)險(xiǎn)預(yù)測模型,系統(tǒng)地分析了混凝土溫濕度場和應(yīng)力的變化規(guī)律,利用大型有限元分析軟件ANSYS對(duì)混凝土約束平板的應(yīng)力場進(jìn)行仿真分析。
[Abstract]:With the more and more extensive application of concrete in the engineering field, the problem of early cracking of concrete structures is becoming more and more serious. The problem of early cracking of concrete has become the cause of deterioration of the performance of concrete structures. Especially, there exists a large number of early cracking phenomena in the large-scale development of highway tunnel concrete engineering, which has seriously affected the rapid development of the national economy. In order to improve the durability of concrete engineering, the mixed mineral admixture concrete with good and easy properties and crack resistance is prepared. The problems related to the cracking of concrete are studied comprehensively from the test and theory, so as to improve the durability of concrete engineering. It is of great significance to ensure the quality and safety of concrete engineering. This paper takes this as the main line, the main research work is as follows:. 1. In actual concrete engineering, because of the instability of raw material source, the quality control of concrete has been seriously affected. Starting from the source of concrete life cycle, the type of cement is studied. The influence of the fineness modulus of sand on the working and basic mechanical properties of concrete was also studied. The basic mechanical properties of concrete with mineral admixtures were also tested for 360 days. The development law of basic mechanical properties of concrete with age and the relationship between them are studied. The influence of the development rate of compressive strength of concrete with age is considered in the prediction formula of compressive strength. The relationship between compressive strength and splitting tensile strength is studied, and the influence of concrete age on them is considered. 2. The effects of cement type and the fineness modulus of sand on the impermeability, free shrinkage and cracking performance of concrete are studied, and the difference of durability and shrinkage and crack resistance of concrete with different mix ratio is evaluated synthetically. 3. By comparing the properties of concrete mixed with mineral admixture and reference concrete, it is found that the addition of mineral admixture in concrete can improve the mechanical properties, impermeability and shrinkage cracking of concrete. 4. Starting with the study of the factors affecting the cracking of concrete, the influence of mechanical properties, temperature deformation, shrinkage and other factors on the cracking of concrete is analyzed synthetically, and the prediction model of crack risk of concrete under non-load is established. The variation law of temperature and humidity field and stress of concrete is analyzed systematically, and the stress field of concrete confined plate is simulated by using the finite element analysis software ANSYS.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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