本文選題：天然輕骨料混凝土 + 石灰石粉��； 參考：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：天然浮石輕骨料混凝土具有輕質(zhì)高強(qiáng)、抗震性能優(yōu)良、抗裂性好、·耐火性好等優(yōu)勢(shì)。國(guó)內(nèi)外對(duì)輕骨料的研究也日益成熟,在工程上的應(yīng)用越來(lái)越廣泛。而隨著混凝土摻合料及砂資源的日益緊張,尋找合適的摻合料刻不容緩。石灰石粉作為生產(chǎn)粗骨料和機(jī)制砂過(guò)程中的廢料,如果隨意丟棄,既污染環(huán)境又浪費(fèi)資源。因此研究將石灰石粉用作混凝土摻合料可以有效緩解常用摻合料供應(yīng)不足及價(jià)格上漲的現(xiàn)實(shí)問(wèn)題,并降低環(huán)境的壓力。本文分別將0%,10%,20%,30%,40%,50%的石灰石粉取代等質(zhì)量的砂子拌制新的輕骨料混凝土,研究不同石灰石粉摻量下輕骨料混凝土在3d,7d,14d,28d,60d,90d,120d時(shí)的抗壓強(qiáng)度,以及7d,14d,28d,60d的劈裂抗拉強(qiáng)度,將試驗(yàn)結(jié)果進(jìn)行對(duì)比,得出石灰石粉的最優(yōu)摻量為30%,而且石灰石粉有利于提高輕骨料混凝土的后期強(qiáng)度。同時(shí),為進(jìn)一步研究石灰石粉對(duì)輕骨料混凝土內(nèi)部結(jié)構(gòu)的影響,借助掃描電鏡對(duì)試件進(jìn)行微觀(guān)結(jié)構(gòu)的分析,討論其破壞機(jī)理。另外,為研究石灰石粉對(duì)輕骨料混凝土抗凍性的影響,采用快凍法測(cè)定在25次,50次,75次,100次,125次,150次,175次,200次,225次,250次循環(huán)時(shí)的質(zhì)量損失和動(dòng)彈模量。然后采用掃描電鏡對(duì)凍融后的各組試件進(jìn)行微觀(guān)機(jī)理的分析發(fā)現(xiàn)加入過(guò)多的石灰石粉對(duì)輕骨料混凝土抗凍性十分不利,摻量在30%左右時(shí)抗凍性較好。根據(jù)超聲波探傷原理,測(cè)定試件的聲時(shí)和波速,將每組試驗(yàn)數(shù)據(jù)建立時(shí)-距圖。比較計(jì)算出的損傷層厚度,發(fā)現(xiàn)摻入30%石灰石粉的最優(yōu)組與基準(zhǔn)組損傷層厚度較小,其它組損傷較為嚴(yán)重。
[Abstract]:Natural pumice lightweight aggregate concrete has the advantages of high strength, good seismic performance, good crack resistance and good fire resistance. The research on lightweight aggregate at home and abroad is becoming more and more mature and widely used in engineering. With the increasing strain of concrete admixture and sand resources, it is urgent to find suitable admixture. Limestone powder, as a waste material in the process of producing coarse aggregate and machine-made sand, can pollute the environment and waste resources if it is discarded at will. Therefore, the use of limestone powder as concrete admixture can effectively alleviate the practical problems of shortage of admixture supply and price rise, and reduce the pressure of environment. In this paper, the new lightweight aggregate concrete of the same quality is mixed with 30% limestone powder and 50% limestone powder, respectively. The compressive strength of the lightweight aggregate concrete is studied at 3 d ~ 7 d ~ (14) d ~ (28) ~ 60 d ~ 90 d ~ (-1) ~ 120 d, and the splitting tensile strength of 7 d ~ (14) d ~ (28) ~ 28 d ~ (60) d, and the test results are compared. The optimum content of limestone powder is 30 and the later strength of lightweight aggregate concrete is improved by limestone powder. At the same time, in order to further study the influence of limestone powder on the internal structure of lightweight aggregate concrete, the microstructure of the specimen was analyzed by SEM, and the failure mechanism was discussed. In addition, in order to study the effect of limestone powder on the frost resistance of lightweight aggregate concrete, the mass loss and dynamic modulus of elasticity were measured at 25 times, 50 times, 75 times, 100 times, 125 times, 150 times, 200 times, 225 times, 250 cycles. Then SEM was used to analyze the microcosmic mechanism of each sample after freezing and thawing. It was found that adding too much limestone powder was very disadvantageous to the frost resistance of lightweight aggregate concrete, and the frost resistance of lightweight aggregate concrete was better when the content was about 30%. According to the principle of ultrasonic flaw detection, the sound time and wave velocity of the specimen were measured, and the time-distance map of each group of test data was established. By comparing the thickness of the damage layer, it is found that the thickness of the damage layer in the optimal group with 30% limestone powder is smaller than that in the reference group, and the damage in the other groups is more serious.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU528

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