本文選題：再生混凝土 + 再生粗骨料�。� 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：隨著我國建筑業(yè)的騰飛,大量建筑的改、擴(kuò)建活動(dòng)也迅猛發(fā)展,由此產(chǎn)生的建筑垃圾,造成了環(huán)境的污染、生態(tài)的破壞、資源的浪費(fèi)。因此將廢舊建筑材料重新加以循環(huán)利用,可緩解資源與環(huán)境壓力,也符合綠色建筑的節(jié)材要求,具有重大研究意義,是未來綠色建筑發(fā)展的必然趨勢(shì)。本文以廢舊建筑材料為研究對(duì)象,對(duì)其再生骨料的循環(huán)利用進(jìn)行了深入的探討和研究。通過實(shí)驗(yàn)測(cè)定再生骨料的表觀密度、吸水率、壓碎指標(biāo)等各項(xiàng)物理力學(xué)性能指標(biāo),并與天然骨料進(jìn)行對(duì)比分析,結(jié)果表明,再生骨料的各項(xiàng)指標(biāo)均能滿足混凝土粗骨料配置要求。為了分析再生骨料摻入量對(duì)混凝土強(qiáng)度的影響,本文選取了三種不同強(qiáng)度的混凝土,對(duì)其摻入不同比例的再生骨料進(jìn)行立方體抗壓、劈裂抗拉、抗折強(qiáng)度試驗(yàn)研究,試驗(yàn)結(jié)果顯示:隨著再生骨料取代率的增加,混凝土的立方體抗壓強(qiáng)度整體呈下降趨勢(shì);劈裂抗拉強(qiáng)度整體呈上升趨勢(shì);抗折強(qiáng)度變化較小。為進(jìn)一步研究再生混凝土的變形性能,本文研究設(shè)計(jì)了應(yīng)力-應(yīng)變曲線試驗(yàn)方案,分析試驗(yàn)結(jié)果得到:隨著再生骨料取代率的增加,其峰值應(yīng)力和峰值應(yīng)變減小,彈性模量降低。為了進(jìn)一步改善再生混凝土的力學(xué)性能,本文選取在工程實(shí)際中廣泛應(yīng)用的C30混凝土為研究對(duì)象,對(duì)其摻入不同體積率的剪切型鋼纖維進(jìn)行立方體抗壓、劈裂抗拉、抗折強(qiáng)度以及應(yīng)力—應(yīng)變曲線試驗(yàn)研究,研究證明:其土立方體抗壓、劈裂抗拉、抗折強(qiáng)度均隨鋼纖維摻入量的增加而提高;應(yīng)力-應(yīng)變曲線試驗(yàn)顯示隨著鋼纖維摻入量的增加,其峰值應(yīng)力和峰值應(yīng)變?cè)龃?彈性模量提高。綜上所述:廢舊建筑材料可以再次循環(huán)利用,且對(duì)各種再生骨料摻量的混凝土降低一個(gè)標(biāo)號(hào)等級(jí)后能夠滿足強(qiáng)度、變形要求,而對(duì)再生混凝土摻入鋼纖維后其強(qiáng)度、變形性均能得到顯著提高,能夠達(dá)到強(qiáng)度、變形要求,可以在工程中推廣應(yīng)用。
[Abstract]:With the rapid development of our country's construction industry, a large number of buildings have been changed, and the expansion activities have also developed rapidly. The resulting construction waste has caused environmental pollution, ecological destruction and waste of resources. Therefore, recycling waste building materials can relieve the pressure of resources and environment, and meet the requirements of green building. It is of great significance to research and is the inevitable trend of the development of green buildings in the future. In this paper, the recycling utilization of recycled aggregate is discussed and studied with waste building materials as the research object. The physical and mechanical properties of recycled aggregate, such as apparent density, water absorption rate, crushing index and so on, were measured by experiments and compared with natural aggregate. Each index of recycled aggregate can meet the requirements of coarse aggregate allocation of concrete. In order to analyze the influence of recycled aggregate on the strength of concrete, three kinds of concrete with different strength were selected, and the cubic compressive strength, split tensile strength and flexural strength of recycled aggregate were studied. The experimental results show that the cube compressive strength of concrete decreases with the increase of the replacement ratio of recycled aggregate, the overall splitting tensile strength increases and the flexural strength changes slightly. In order to further study the deformation behavior of recycled concrete, a stress-strain curve test scheme is designed. The results show that the peak stress and strain decrease with the increase of recycled aggregate replacement rate. The elastic modulus is reduced. In order to further improve the mechanical properties of recycled concrete, the C30 concrete, which is widely used in engineering practice, is studied in this paper. The experimental study on the bending strength and stress-strain curve shows that the cube compressive, splitting and tensile strength of the soil increase with the increase of steel fiber content. The stress-strain curve test shows that the peak stress and strain increase and the elastic modulus increases with the increase of steel fiber content. To sum up: waste building materials can be recycled again, and can meet the requirements of strength and deformation after reducing one grade of concrete with various recycled aggregate content, and the strength of recycled concrete with steel fiber, The deformability can be improved remarkably and can meet the requirements of strength and deformation. It can be popularized and applied in engineering.
【學(xué)位授予單位】：西安科技大學(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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