【摘要】：再生骨料技術(shù)對(duì)于節(jié)約資源、保護(hù)環(huán)境和實(shí)現(xiàn)建筑業(yè)的可持續(xù)發(fā)展具有重要意義,也是國內(nèi)研究人員關(guān)注的熱點(diǎn)。目前,國內(nèi)關(guān)于再生混凝土的研究尚未成熟,且大部分是針對(duì)再生骨料高取代率下混凝土性能的研究,其理論結(jié)果難以系統(tǒng)地指導(dǎo)實(shí)際生產(chǎn)與工程應(yīng)用。本文在國內(nèi)外研究成果的基礎(chǔ)上,立足于國內(nèi)再生骨料制備工藝及生產(chǎn)現(xiàn)狀,系統(tǒng)研究了再生骨料在低取代率下再生混凝土的強(qiáng)度和耐久性能,對(duì)再生骨料的實(shí)際應(yīng)用具有重要的理論意義和實(shí)踐價(jià)值。 本文以水膠比、再生粗骨料取代率、再生細(xì)骨料取代率、礦物摻合料摻量為變化參數(shù),進(jìn)行了混凝土抗壓強(qiáng)度、軸心抗壓強(qiáng)度、抗氯離子滲透性能、抗凍性能、抗碳化性能試驗(yàn)。并分析了不同水膠比、再生骨料不同取代率和礦物摻合料不同摻量下混凝土強(qiáng)度和耐久性的變化規(guī)律。針對(duì)再生粗骨料自身缺陷,采用鹽酸和PVA聚合物兩種改善措施分別對(duì)再生粗骨料進(jìn)行改性,對(duì)混凝土抗壓強(qiáng)度、軸心抗壓強(qiáng)度、抗氯離子滲透、抗凍性能、抗碳化性能進(jìn)行測(cè)定,分析了鹽酸和PVA聚合物對(duì)再生粗骨料界面改性后混凝土強(qiáng)度和耐久性的改善效果。基于再生混凝土早期抗裂性能較差,試驗(yàn)研究了聚丙烯纖維對(duì)再生混凝土早期抗裂的改善效果。 相比普通混凝土,再生粗骨料取代率在30%以內(nèi)時(shí),低水膠比(0.40-0.48)時(shí)再生混凝土強(qiáng)度略有降低,耐久性指標(biāo)均有一定幅度的提高,高水膠比(0.56-0.60)時(shí)再生混凝土強(qiáng)度略有提高；再生粗骨料取代率超過30%時(shí),強(qiáng)度和耐久性能有所降低。再生粗骨料混凝土中摻入粉煤灰,混凝土抗氯離子滲透性能明顯提高,抗凍性能變化不明顯,抗碳化性能呈下降趨勢(shì)；粉煤灰與礦粉各摻15%時(shí),混凝土抗氯離子滲透性能和抗凍性能均顯著提高,但其抗壓強(qiáng)度相對(duì)較低。鹽酸改性方法對(duì)混凝土強(qiáng)度和耐久性均有一定改善；PVA聚合物改性后抗凍性有所降低,其它性能指標(biāo)均有所改善；聚丙烯纖維能夠有效改善再生混凝土的早期抗裂性能。再生細(xì)骨料取代率在30%以內(nèi)時(shí),混凝土強(qiáng)度和耐久性均優(yōu)于普通混凝土。再生細(xì)骨料混凝土中不建議使用礦物摻合料。
[Abstract]:The technology of recycled aggregate plays an important role in saving resources, protecting the environment and realizing the sustainable development of the construction industry. At present, the domestic research on recycled concrete has not been mature, and most of it is the research on the performance of the concrete at the high substitution rate of recycled aggregate, and the theoretical results are difficult to guide the actual production and engineering application systematically. On the basis of domestic and foreign research results, based on the preparation technology and production status of recycled aggregate in China, the strength and durability of recycled aggregate at low substitution rate are studied, and the practical application of recycled aggregate is of great theoretical and practical value. In this paper, the concrete compressive strength, axial compressive strength, anti-chloride penetration resistance, anti-freezing performance and anti-carbonization performance of the concrete were tested with the ratio of water-to-cement ratio, the replacement rate of the regenerated coarse aggregate, the substitution rate of the regenerated fine aggregate and the variation of the content of the mineral admixture. The change rules of concrete strength and durability under different ratio of water and cement, different substitution rate of recycled aggregate and different content of mineral admixture are also analyzed. in that light of the defect of the recycled coarse aggregate, two improvement measures of hydrochloric acid and PVA polymer are adopted to modify the recycled coarse aggregate, and the compressive strength, the axial compression strength, the chloride ion penetration, the anti-freezing property and the anti-carbonization property of the concrete are measured, The effect of hydrochloric acid and PVA polymer on the strength and durability of recycled coarse aggregate is analyzed. The effect of polypropylene fiber on the early crack resistance of recycled concrete was studied based on the poor early crack resistance of recycled concrete. When the substitution rate of the recycled coarse aggregate is within 30% compared with the common concrete, the strength of the recycled concrete is slightly reduced when the ratio of the low water-to-water ratio (0.40-0.48) is within 30%, and the durability index has a certain amplitude, and the strength of the recycled concrete is slightly higher when the ratio of the high water-to-water ratio (0.56-0.60) is higher (0.56-0.60). It is possible to improve the strength and durability when the substitution rate of the recycled coarse aggregate exceeds 30%. in that method, the fly ash is incorporated into the recycled coarse aggregate concrete, the anti-chloride ion penetration property of the concrete is obviously improved, the change of the anti-freezing property is not obvious, and the anti-carbonization property is in a downward trend; and when the fly ash and the mineral powder are mixed with each other for 15%, the anti-chloride ion penetration property and the anti-freezing property of the concrete are both obvious to improve, but its compressive strength The modified method has a certain improvement on the strength and the durability of the concrete; the anti-freezing property of the PVA polymer is reduced, and the other performance indexes are improved; and the polypropylene fiber can effectively improve the early-stage resistance of the recycled concrete. When the substitution rate of the recycled fine aggregate is within 30%, the strength and durability of the concrete are superior to that of the common Concrete is not recommended in recycled fine aggregate concrete
【學(xué)位授予單位】：北京交通大學(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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