本文選題：高強(qiáng) + 再生混凝土��； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：在科技日新月異、經(jīng)濟(jì)浪潮全球化的今天,土木工程建設(shè)蓬勃發(fā)展。但也因此產(chǎn)生了諸多矛盾,建筑材料的無節(jié)制使用過度消耗了社會(huì)資源,也嚴(yán)重污染和破壞了自然環(huán)境。為了最大限度地緩解混凝土對(duì)資源和環(huán)境產(chǎn)生的一系列問題,如何改善以大量消耗資源能源的粗放型生產(chǎn)方式,轉(zhuǎn)化為節(jié)約資源、減輕環(huán)境負(fù)擔(dān)的綠色工藝,將混凝土的生產(chǎn)工藝轉(zhuǎn)變?yōu)榭沙掷m(xù)發(fā)展的模式,成為混凝土研究與發(fā)展的必然趨勢(shì)。再生混凝土在此背景下誕生。本試驗(yàn)在再生混凝土配合比優(yōu)化設(shè)計(jì)的基礎(chǔ)上,分別以再生粗骨料取代率、水膠比和膠凝材料用量作為試驗(yàn)變化參數(shù),對(duì)高強(qiáng)再生混凝土的抗壓性能和變形性能進(jìn)行了系統(tǒng)研究,旨在推動(dòng)高強(qiáng)再生混凝土在工程領(lǐng)域的實(shí)踐應(yīng)用。通過對(duì)4種再生粗骨料取代率分別為0%、30%、70%、100%,3種混凝土水膠比分別為0.28、0.32、0.36,以及3種膠凝材料用量分別為520kg/m3、 570kg/m3、620kg/m3的36組試件,每組包括立方體試件和棱柱體試件各3個(gè),共計(jì)216個(gè)試件的試驗(yàn)研究,得到以下主要結(jié)論：1.本試驗(yàn)以配合比理論計(jì)算為基礎(chǔ),通過優(yōu)化配合比設(shè)計(jì),采用降低水膠比、增大膠凝材料用量和摻加礦物質(zhì)摻合料等途徑,在不同的粗骨料取代率30%、70%和100%下,配制出高強(qiáng)混凝土。當(dāng)再生骨料取代率達(dá)到100%時(shí),再生混凝土強(qiáng)度可達(dá)C80,這說明同樣配合比的情況下,利用再生粗骨料配制高強(qiáng)再生混凝土是可以實(shí)現(xiàn)的。2.在再生粗骨料取代率、水膠比、膠凝材料用量等幾個(gè)影響因素中,水膠比對(duì)高強(qiáng)再生混凝土強(qiáng)度的影響是較為顯著的,即隨著水膠比的增加,冉生高強(qiáng)混凝土的強(qiáng)度呈下降趨勢(shì)。3.在高強(qiáng)再生混凝士的配制過程中,在一定程度上提高水膠比,配合適當(dāng)?shù)拇止橇先〈?既可以取得較好的強(qiáng)度效果,也可在實(shí)際工程中實(shí)現(xiàn)較好的經(jīng)濟(jì)效益。4.高強(qiáng)再生混凝土的應(yīng)力—應(yīng)變曲線呈現(xiàn)的規(guī)律與普通混凝土基本一致。無量綱應(yīng)力—應(yīng)變曲線顯示,不論粗骨料取代率、水膠比、膠凝材料用量等因素如何變化,高強(qiáng)再生混凝土具有比天然混凝土更加顯著的脆性性質(zhì)。5.在變形性能方面,隨著粗骨料取代率的增加,不同水膠比、不同膠凝材料用量下試件的延性系數(shù)也呈現(xiàn)不同的變化趨勢(shì)。膠凝材料用量多的試件普遍呈現(xiàn)出延性系數(shù)略有增加的趨勢(shì),但再生粗骨料取代率為100%時(shí),延性系數(shù)呈下降趨勢(shì)的較多。6.當(dāng)再生骨料取代率、水膠比、膠凝材料用量等不同因素變化時(shí),高強(qiáng)再生混凝土耗能系數(shù)變化規(guī)律與延性系數(shù)變化規(guī)律基本一致。
[Abstract]:With the rapid development of science and technology and the globalization of economy, the construction of civil engineering is booming. However, there are many contradictions. The excessive use of building materials consumes social resources and pollutes and destroys the natural environment. In order to alleviate a series of problems caused by concrete to resources and environment to the maximum extent, how to improve the extensive mode of production, which consumes a lot of resources and energy, and transforms it into a green process that saves resources and lightens the burden of environment. It is an inevitable trend of concrete research and development to change the concrete production technology into a sustainable development model. Recycled concrete was born in this background. On the basis of optimum design of recycled concrete mixture ratio, the replacement ratio of recycled coarse aggregate, the ratio of water to binder and the amount of cementitious material are respectively used as the experimental parameters. The compressive and deformation properties of high strength recycled concrete are studied systematically in order to promote the practical application of high strength recycled concrete in engineering field. The ratio of water to binder of three kinds of concrete was 0.280.32 / 0.36, and the dosage of three kinds of cementing materials was 520kg / m ~ 3, respectively. The 36 groups of 570kg/m3620kg/m3 were divided into three groups: cube specimen and prism specimen, each group consisted of three cube specimens and three prism specimens. The ratio of water to binder was 0.28 kg / m ~ (3), respectively, and the ratio of three kinds of cementing materials was 520kg / m ~ (3), respectively. A total of 216 specimens were tested and the following main conclusions were obtained: 1. Based on the theoretical calculation of mixture ratio, by optimizing the mix ratio design, reducing the water / binder ratio, increasing the amount of cementitious material and adding mineral admixture, etc., under the conditions of different coarse aggregate substitution rate of 30% and 100%, High strength concrete is prepared. When the replacement ratio of recycled aggregate is 100, the strength of recycled concrete can reach C80, which shows that it is possible to use recycled coarse aggregate to prepare high strength recycled concrete with the same mix ratio. Among the influencing factors such as the replacement ratio of recycled coarse aggregate, the ratio of water to binder and the amount of cementitious material, the effect of water / binder ratio on the strength of high strength recycled concrete is more significant, that is, with the increase of water / binder ratio, The strength of Ransheng high strength concrete shows a downward trend. In the process of preparation of high strength regenerated coagulant, to a certain extent, the ratio of water to binder and the replacement rate of coarse aggregate can be improved to a certain extent, which can not only obtain better strength effect, but also achieve better economic benefit in practical engineering. The stress-strain curve of high strength recycled concrete is basically consistent with that of ordinary concrete. The dimensionless stress-strain curves show that high strength recycled concrete has more brittleness than natural concrete, regardless of the change of coarse aggregate replacement ratio, water / binder ratio and the amount of cementitious material. In the aspect of deformation properties, the ductility coefficient of the specimens with different water / binder ratio and different amount of cementitious material also shows a different trend with the increase of coarse aggregate replacement ratio. The ductility coefficient of the specimens with more cementitious materials is increasing slightly, but when the replacement ratio of regenerated coarse aggregate is 100, the ductility coefficient is more. 6. When the replacement ratio of recycled aggregate, the ratio of water to binder and the amount of cementitious material are changed, the variation of energy dissipation coefficient of high strength recycled concrete is basically consistent with that of ductility coefficient.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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