本文選題：EPS混凝土　切入點(diǎn)：靜態(tài)力學(xué)性能　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：聚苯乙烯(Expanded Polystyrence,簡稱EPS)混凝土是一種環(huán)境友好型的新型建筑材料,由于其具有輕質(zhì)和保溫隔熱性能良好的特點(diǎn),目前已被廣泛地應(yīng)用于建筑工程中。因此,其力學(xué)行為和本構(gòu)模型成為混凝土材料學(xué)科的研究熱點(diǎn)。本文首先試驗(yàn)研究了不同粒徑(0.5-1mm、2-3mm、5-6mm)、不同置換率(25%、50%、75%)的EPS混凝土靜態(tài)壓縮、劈裂和抗折性能。分析了不同置換率下EPS混凝土的壓縮應(yīng)力應(yīng)變曲線;分析了置換率對抗壓、劈裂和抗折性能的影響;研究了EPS粒徑對混凝土靜態(tài)力學(xué)性能的影響;建立了相對抗壓強(qiáng)度、相對抗拉強(qiáng)度與相對密度的關(guān)系;采用單孔試驗(yàn)研究了EPS顆粒粒徑對混凝土力學(xué)性能的影響機(jī)理,推導(dǎo)出粒徑大小對混凝土強(qiáng)度影響的理論表達(dá)式,使用試驗(yàn)數(shù)據(jù)驗(yàn)證了理論模型的有效性。選取粒徑為0.5-1mm、置換率為50%的EPS混凝土作為參照試驗(yàn),按照纖維摻入量為0.8kg/m3、1.3 kg/m3和1.8 kg/m3摻入聚丙烯纖維,對試件的抗壓強(qiáng)度、劈裂抗拉強(qiáng)度和抗折強(qiáng)度進(jìn)行測試。分析抗壓、抗拉和抗折強(qiáng)度隨纖維摻量的變化規(guī)律,并進(jìn)一步分析纖維對EPS混凝土力學(xué)性能的影響機(jī)理。選取粒徑為0.5-1mm,EPS置換率為50%、75%的兩組EPS混凝土作為參照試驗(yàn),以機(jī)制砂等質(zhì)量置換EPS混凝土中的天然河砂,置換率為0、20%、40%、60%、80%。對EPS混凝土抗壓強(qiáng)度和劈裂抗拉強(qiáng)度進(jìn)行測試。分析抗壓和抗拉隨機(jī)制砂置換率的變化規(guī)律并進(jìn)一步分析機(jī)制砂對EPS混凝土力學(xué)性能的影響機(jī)理。基于彈性損傷和經(jīng)典塑性力學(xué),參照普通混凝土的受壓損傷本構(gòu)模型,提出使用雙折線損傷本構(gòu)模型來描述混凝土的應(yīng)力應(yīng)變關(guān)系,通過試驗(yàn)所測數(shù)據(jù)確定本構(gòu)模型的特征參數(shù)。并把損傷本構(gòu)曲線和試驗(yàn)所得應(yīng)力應(yīng)變曲線進(jìn)行對比,兩者吻合較好,初步驗(yàn)證了該模型的有效性。為研究EPS混凝土在復(fù)雜載荷作用下的本構(gòu)模型打下基礎(chǔ)。
[Abstract]:Polystyrene expanded Polystyrene (EPS) concrete is a new kind of environment-friendly building material. It has been widely used in construction engineering because of its good properties of light weight and heat insulation. Its mechanical behavior and constitutive model have become a hot research topic in the field of concrete materials. In this paper, the static compression of EPS concrete with different diameters of 0.5-1mm ~ 2-3mm ~ 5mm ~ 6 mm and different displacement ratio of 25mm ~ 50mm / 75) has been studied. The compressive stress-strain curves of EPS concrete under different displacement rates are analyzed, the effects of displacement ratio on compressive, splitting and flexural properties are analyzed, and the effects of EPS particle size on static mechanical properties of concrete are studied. The relationship between relative compressive strength, relative tensile strength and relative density is established, and the influence mechanism of EPS particle size on the mechanical properties of concrete is studied by single hole test, and the theoretical expression of the influence of particle size on concrete strength is deduced. The validity of the theoretical model was verified by using the experimental data. The compressive strength of the specimens was determined by adding 0.8 kg / m 31.3 kg/m3 and 1.8 kg/m3 polypropylene fibers to EPS concrete with a diameter of 0.5-1mm and a replacement ratio of 50%. The splitting tensile strength and flexural strength were tested. The variation of compressive, tensile and flexural strength with fiber content was analyzed. The influence mechanism of fiber on mechanical properties of EPS concrete was further analyzed. Two groups of EPS concrete with a diameter of 0.5-1 mm and a replacement ratio of 50% or 75% were selected as reference tests, and the natural river sand in EPS concrete was replaced with machine-made sand of equal mass. The compressive strength and splitting tensile strength of EPS concrete were tested. The change of replacement rate of compressive and tensile random sand making was analyzed, and the influence mechanism of mechanism sand on mechanical properties of EPS concrete was further analyzed. For elastic damage and classical plastic mechanics, Referring to the compressive damage constitutive model of ordinary concrete, a double broken line damage constitutive model is proposed to describe the stress-strain relationship of concrete. The characteristic parameters of the constitutive model are determined by the experimental data, and the damage constitutive curve is compared with the stress-strain curve. The validity of the model is preliminarily verified, which lays a foundation for studying the constitutive model of EPS concrete under complex loads.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張恩;楊會偉;曹瑞東;劉昊棟;路國運(yùn);;含孔混凝土力學(xué)性能理論和試驗(yàn)研究[J];混凝土;2017年06期

2 朱洪波;李晨;吳夢雪;吳凱凡;;水泥-聚苯乙烯輕質(zhì)材料的準(zhǔn)靜態(tài)壓縮力學(xué)行為[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年10期

3 胡俊;王平;丁克偉;;含緩沖層隧道結(jié)構(gòu)抗爆性能研究[J];公路交通科技;2015年09期

4 朱洪波;李晨;閆美珠;吳夢雪;;水泥-聚苯乙烯輕質(zhì)材料的制備及抗沖擊性[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年05期

5 朱洪波;LI Chen;WANG Peiming;WU Mengxue;YAN Meizhu;;Impact Resistance of a Novel Expanded Polystyrene Cement-based Material[J];Journal of Wuhan University of Technology(Materials Science Edition);2014年02期

6 巫緒濤;謝思發(fā);胡俊;;EPS混凝土的動態(tài)抗壓強(qiáng)度和吸能特性[J];振動與沖擊;2013年17期

7 楊奉源;盧忠遠(yuǎn);何順愛;牛云輝;;超輕EPS復(fù)合泡沫混凝土性能研究[J];混凝土與水泥制品;2012年05期

8 白二雷;許金余;高志剛;;EPS混凝土沖擊壓縮韌性研究[J];混凝土;2011年11期

9 胡俊;巫緒濤;胡時(shí)勝;;EPS混凝土動態(tài)力學(xué)性能研究[J];振動與沖擊;2011年07期

10 巫緒濤;謝思發(fā);胡俊;;改性EPS混凝土的動態(tài)力學(xué)行為[J];混凝土;2011年02期

相關(guān)博士學(xué)位論文 前4條

1 程從密;EPS輕集料混凝土組成結(jié)構(gòu)與性能研究[D];華南理工大學(xué);2013年

2 劉Z拇，

本文編號：1594466