本文選題：混凝土 + 碳化　； 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：混凝土結(jié)構(gòu)的耐久性問題日益凸顯,越來越受到重視�；炷撂蓟悄途眯匝芯康囊粋�(gè)重要分支,由碳化引起的結(jié)構(gòu)破壞損害不可估量�；炷撂蓟缚諝庵械亩趸嫉人嵝詺怏w與混凝土內(nèi)的可碳化物質(zhì)發(fā)生反應(yīng),致使混凝土內(nèi)的結(jié)構(gòu)組成發(fā)生改變的現(xiàn)象�；炷撂蓟瘯�(huì)影響混凝土保護(hù)層的功能,給結(jié)構(gòu)帶來嚴(yán)重的安全隱患。因此,混凝土碳化問題始終是重點(diǎn)研究課題。本論文依據(jù)《普通混凝土長(zhǎng)期性能和耐久性能試驗(yàn)方法標(biāo)準(zhǔn)》(GB/T 50082—2009)進(jìn)行混凝土快速碳化試驗(yàn),對(duì)混凝土碳化的主要影響因素—水泥用量、水灰比、粉煤灰摻量、環(huán)境溫度、相對(duì)濕度展開研究,對(duì)上述影響因素與混凝土碳化的關(guān)系進(jìn)行探討。結(jié)果表明：對(duì)于混凝土自身影響因素,水灰比和粉煤灰摻量越大,混凝土越容易碳化,相反地,增加水泥用量會(huì)抑制混凝土碳化。研究水灰比和水泥用量的綜合影響可知,占主導(dǎo)地位的是水灰比。對(duì)于環(huán)境影響因素,在本文研究范圍內(nèi),溫度越高,加快混凝土碳化,相對(duì)濕度越大,混凝土不易碳化。本文在前人研究的基礎(chǔ)上,以混凝土快速碳化試驗(yàn)的試驗(yàn)結(jié)果計(jì)算出上述因素對(duì)混凝土碳化的影響系數(shù),建立考慮水泥用量、水灰比、粉煤灰摻量、環(huán)境溫度、相對(duì)濕度的混凝土碳化深度預(yù)測(cè)模型。通過參數(shù)轉(zhuǎn)換,用大型通用有限元分析軟件ANSYS熱分析模塊建立模型,提出合理的假設(shè)條件,對(duì)混凝土碳化過程進(jìn)行數(shù)值模擬,用模擬結(jié)果和實(shí)例對(duì)混凝土碳化深度預(yù)測(cè)模型進(jìn)行驗(yàn)證。僅由單一因素建立的模型具有局限性,而且現(xiàn)有預(yù)測(cè)模型對(duì)環(huán)境影響因素的研究較少。本文建立的碳化模型考慮環(huán)境因素的影響,更具實(shí)用性。
[Abstract]:The durability of concrete structure is becoming more and more important. Carbonation of concrete is an important branch of durability research, and the damage caused by carbonation is incalculable. Carbonation of concrete refers to the reaction of carbon dioxide and other acidic gases in the air with carbonable substances in concrete, which results in the change of structure composition in concrete. The carbonation of concrete will affect the function of concrete cover and bring serious hidden danger to the structure. Therefore, the carbonation of concrete has always been a key research topic. In this paper, the rapid carbonation test of concrete is carried out according to the standard of test methods for long-term performance and durability of ordinary concrete (GB / T 50082-2009). The main factors affecting the carbonation of concrete are cement dosage, water-cement ratio, fly ash content, ambient temperature, etc. The relationship between the above factors and concrete carbonation is discussed. The results show that the more the ratio of water to cement and the content of fly ash is, the easier carbonation of concrete is. On the contrary, the increase of cement content will inhibit the carbonation of concrete. The comprehensive influence of water cement ratio and cement content shows that water cement ratio dominates. For the environmental factors, the higher the temperature is, the faster the carbonization of concrete is, and the greater the relative humidity is, the harder the carbonation of concrete is. On the basis of previous research, the influence coefficient of the above factors on concrete carbonization is calculated based on the experimental results of concrete rapid carbonization test, and the factors such as cement content, water cement ratio, fly ash content, environment temperature are established. The prediction model of concrete carbonation depth based on relative humidity. Through parameter conversion, the model is established by using the large scale finite element analysis software ANSYS thermal analysis module, and the reasonable assumption condition is put forward, and the carbonation process of concrete is simulated numerically. The prediction model of concrete carbonation depth is verified by simulation results and examples. The model established by single factor is limited, and the existing prediction model has little research on environmental impact factors. The carbonation model established in this paper takes into account the influence of environmental factors and is more practical.
【學(xué)位授予單位】：遼寧工程技術(shù)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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