發(fā)布時(shí)間：2018-06-18 10:00

  本文選題：酸雨 + 荷載�。� 參考：《湖南科技大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)的快速發(fā)展,環(huán)境污染日趨嚴(yán)重,混凝土構(gòu)件劣化加速。與此同時(shí),砂石資源短缺,陶瓷廢料不斷增多;為減小酸雨-荷載作用影響及節(jié)約砂石資源,本文主要研究以廢瓷磚為再生粗細(xì)骨料、以陶瓷粉為摻合料制備新型綠色的再生骨料混凝土,根據(jù)湖南省酸雨的特點(diǎn)以及建筑物承受荷載的一般情況,每組配合比混凝土分別在0.3fu和0.5fu作用后進(jìn)行酸雨溶液干濕循環(huán)試驗(yàn),研究廢瓷磚再生骨料混凝土在酸雨-荷載共同作用下的性能影響,包括質(zhì)量變化率、強(qiáng)度變化率、化學(xué)結(jié)合水含量、中性化深度和微觀(guān)結(jié)構(gòu)的觀(guān)察。主要研究結(jié)果如下:在模擬酸雨侵蝕試驗(yàn)中,隨著循環(huán)次數(shù)的增加,廢瓷磚再生骨料混凝土的質(zhì)量變化先增加后減小,且在循環(huán)至10次后開(kāi)始呈下降趨勢(shì);原生碎石、廢瓷磚再生粗骨料、廢瓷磚再生粗細(xì)骨料混凝土的強(qiáng)度先增加后降低,中性化深度增大。隨著陶瓷粉摻量的增加,廢瓷磚再生骨料混凝土的強(qiáng)度損失增大,中性化深度減小,化學(xué)結(jié)合水含量減小。隨著pH值的降低,廢瓷磚再生骨料混凝土的強(qiáng)度降低,中性化深度增大,化學(xué)結(jié)合水含量減小。與模擬酸雨侵蝕試驗(yàn)相比,酸雨-荷載共同作用下,由于荷載的添加,廢瓷磚再生骨料混凝土的質(zhì)量變化率前期(循環(huán)至5次前)增長(zhǎng)較快,后期(循環(huán)至10次后)減小更迅速,且先出現(xiàn)質(zhì)量損失;強(qiáng)度變化率前期(循環(huán)至10次)減小,后期(循環(huán)10次以后)強(qiáng)度損失較快;中性化深度增加,化學(xué)結(jié)合水含量增加。在允許荷載范圍內(nèi),隨著荷載的增大,廢瓷磚再生骨料混凝土的質(zhì)量變化率前期(循環(huán)至5次)增大,后期(循環(huán)至10次后)減小;強(qiáng)度變化率減小,且循環(huán)至30次時(shí)為負(fù)值,相對(duì)于初始強(qiáng)度出現(xiàn)損失;中性化深度增大,化學(xué)結(jié)合水含量略有升高;微觀(guān)結(jié)構(gòu)中,針狀A(yù)Ft增多,且通孔較多,結(jié)構(gòu)變得疏松,混凝土內(nèi)部孔隙增多,酸雨溶液侵蝕后強(qiáng)度損失更大。根據(jù)已有酸雨侵蝕混凝土中性化深度預(yù)測(cè)模型文獻(xiàn),通過(guò)引入荷載影響系數(shù)及確定相關(guān)參數(shù)后,推導(dǎo)出了酸雨-荷載共同作用下廢瓷磚再生骨料混凝土中性化深度預(yù)測(cè)模型,并將已有試驗(yàn)數(shù)據(jù)代入壽命預(yù)測(cè)模型得出計(jì)算值并將其與中性化深度實(shí)測(cè)值進(jìn)行對(duì)比,計(jì)算值與試驗(yàn)結(jié)果吻合較好,該模型對(duì)酸雨-荷載共同作用下廢瓷磚再生骨料混凝土中性化的預(yù)測(cè)有一定的參考價(jià)值。
[Abstract]:With the rapid development of economy, environmental pollution is becoming more and more serious, and the deterioration of concrete members is accelerated. In order to reduce the influence of acid rain and load and save the sand and stone resources, the waste ceramic tile is used as the recycled coarse aggregate. A new type of green recycled aggregate concrete was prepared with ceramic powder as admixture. According to the characteristics of acid rain in Hunan Province and the general situation of building bearing load, The dry and wet cycle tests of acid rain solution were carried out in each group of concrete after the action of 0.3fu and 0.5fu. The effects of acid rain and load on the performance of recycled aggregate concrete from ceramic tile were studied, including the rate of mass change and the rate of change of strength. Observation of chemically bound water content, neutralization depth and microstructure. The main results are as follows: in the simulated acid rain erosion test, with the increase of cycle times, the quality change of recycled aggregate concrete of ceramic tile increases first and then decreases, and then decreases after 10 cycles. The strength of recycled coarse aggregate concrete increased first and then decreased, and the neutralization depth increased. With the increase of ceramic powder content, the strength loss, neutralization depth and chemically bound water content of recycled aggregate concrete increased. With the decrease of pH value, the strength of recycled aggregate concrete decreases, the neutralization depth increases, and the water content of chemically bonded concrete decreases. Compared with the simulated acid rain test, under the combined action of acid rain and load, the mass change rate of recycled aggregate concrete of waste ceramic tile increases faster (from the cycle to 5 times) because of the addition of load. In the later period (cycle to 10 times), it decreased more rapidly, and appeared mass loss first; the intensity change rate decreased in the early stage (cycle to 10 times), and in the later period (after 10 cycles) the loss of strength was faster; the neutralization depth increased and the content of chemically bound water increased. Within the allowable load range, with the increase of the load, the mass change rate of recycled aggregate concrete increases at the early stage (up to 5 cycles), decreases at the later stage (after 10 cycles), and decreases in the strength change rate, and is negative at 30 cycles. Relative to the initial strength, loss occurs; the neutralization depth increases, the chemically bound water content slightly increases; in the microstructure, the acicular AFT increases, and there are more through pores, the structure becomes loose, and the internal porosity of concrete increases. The strength loss of acid rain solution is greater after erosion. According to the existing literature on the prediction model of neutralization depth of acid rain corroded concrete, a prediction model of neutralization depth of recycled aggregate concrete of waste ceramic tile under the combined action of acid rain and load is derived by introducing load influence coefficient and determining relevant parameters. The calculated values are compared with the measured values of neutralization depth, and the calculated values are in good agreement with the experimental results. The model can be used to predict the neutralization of recycled aggregate concrete under the combined action of acid rain and load.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU528

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