本文選題：再生保溫混凝土　切入點：凍融循環(huán)　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】：隨著我國新型、快速城鎮(zhèn)化建設(shè)的需求,在資源節(jié)約、環(huán)境友好、綠色循壞發(fā)展方向的指導(dǎo)下,再生保溫混凝土應(yīng)運而生。由于運用了再生骨料和保溫骨料,再生保溫混凝土具備解決建筑垃圾、資源重復(fù)利用的優(yōu)勢,同時具有輕質(zhì)、保溫、節(jié)能、無機、防火的特點,有著進(jìn)一步深入研究的價值。本文在�；⒅楸鼗炷烈延锌蒲谐晒幕A(chǔ)上,摻入不同比例的再生骨料配合而成再生保溫混凝土,研究其在常溫下及凍融循環(huán)后的基本力學(xué)性能,探究經(jīng)過凍融循環(huán)后再生保溫混凝土力學(xué)性能退化規(guī)律,回歸分析凍融循環(huán)后力學(xué)性能理論計算公式,為再生保溫混凝土在實際工程的應(yīng)用實踐上提供依據(jù)。本文主要研究內(nèi)容及結(jié)論如下:(1)對再生保溫混凝土的基本力學(xué)性能進(jìn)行了試驗研究,探究了再生粗骨料取代率對其各項基本力學(xué)性能的影響分析及破壞特征及機理。(2)開展不同再生骨料取代率、不同凍融循環(huán)次數(shù)下的凍融循環(huán)試驗。通過從試塊的外部形態(tài)、相對動彈性模量、質(zhì)量損失率以及強度損失率四個方面分析了凍融對混凝土力學(xué)性能的影響。得出再生保溫混凝土立方體和棱柱體抗壓強度、抗拉強度、抗折強度隨凍融循環(huán)次數(shù)變化的定量表達(dá)式。(3)通過試驗研究可知,隨著凍融次數(shù)的增加,再生保溫混凝土外觀逐漸變得粗糙、凹凸不平,表皮剝蝕而酥松,有缺角現(xiàn)象,粗細(xì)骨料逐漸顯露,裂紋隨著數(shù)量越來越多,裂紋的寬度也慢慢增大,裂紋的發(fā)展方向漸漸向試件內(nèi)部延伸;由于凍脹作用,試塊材料內(nèi)部水分不斷凍結(jié),試塊質(zhì)量先增大,后因凍融循環(huán)作用,表面剝蝕,質(zhì)量因此損失;再生骨料摻入量越大,隨著凍融次數(shù)的增大,質(zhì)量損失越大。不同再生骨料取代率下的保溫混凝土的強度呈現(xiàn)線性遞減;隨著凍融次數(shù)的增加,再生保溫混凝土抗壓強度指標(biāo)退化率先慢后快;劈裂抗拉強度強度指標(biāo)退化率呈明顯陡降趨勢,前期顯著降低,后呈加劇狀態(tài),最后再次快速降低;靜力彈性模量變化不明顯。
[Abstract]:With the demand of new and rapid urbanization construction in our country, under the guidance of resource saving, environment friendly and green follow the bad developing direction, recycled insulation concrete emerges as the times require. Because of the use of recycled aggregate and thermal insulation aggregate, Recycled insulating concrete has the advantages of solving construction waste and reuse of resources, at the same time, it has the characteristics of light weight, heat preservation, energy saving, inorganic, fire prevention, etc. On the basis of the existing scientific research achievements of vitrified microbead insulation concrete, the recycled insulation concrete is formed by mixing different proportions of recycled aggregate. The basic mechanical properties at room temperature and after freeze-thaw cycle are studied, the degradation law of mechanical properties of regenerated insulating concrete after freeze-thaw cycle is explored, and the formula of theoretical calculation of mechanical properties after freeze-thaw cycle is analyzed by regression analysis. The main contents and conclusions of this paper are as follows: (1) the basic mechanical properties of recycled insulating concrete are studied experimentally. The influence of regenerated coarse aggregate replacement rate on its basic mechanical properties and its failure characteristics and mechanism were investigated. (2) different recycled aggregate replacement rates and freeze-thaw cycles were tested under different freezing and thawing cycles. The effects of freeze-thaw on the mechanical properties of concrete are analyzed from four aspects: relative dynamic modulus of elasticity, mass loss rate and strength loss rate. The compressive strength and tensile strength of recycled insulating concrete cube and prism are obtained. The quantitative expression of flexural strength with the number of freeze-thaw cycles. (3) with the increase of freezing and thawing times, the appearance of recycled insulating concrete becomes rough and uneven, the skin denudates and becomes crisp, and there is a phenomenon of lack of angle. With the increasing number of cracks, the crack width gradually increased, and the development direction of the crack gradually extended to the inside of the specimen. Because of the frost heaving, the moisture in the sample material kept freezing, and the mass of the specimen first increased. As a result of freeze-thaw cycle, surface erosion and mass loss, the more recycled aggregate is added, the greater the mass loss is with the increase of freezing and thawing times. The strength of insulating concrete with different recycled aggregate replacement ratio decreases linearly. With the increase of freeze-thaw times, the degradation of compressive strength index of recycled insulating concrete is first slow and fast, and the degradation rate of splitting tensile strength index shows a steep downward trend, which decreases significantly in the early stage, then intensifies, and then rapidly decreases again. The change of static elastic modulus is not obvious.
【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

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