【摘要】：天然水硬性石灰的使用有悠久的歷史,水泥的大量應(yīng)用使得天然水硬性石灰的應(yīng)用有所縮減,近年來由于天然水硬性石灰在文物修復(fù)領(lǐng)域的優(yōu)越性其應(yīng)用有所復(fù)蘇。關(guān)于天然水硬性石灰的研究報(bào)道很少。為了弄清天然水硬性石灰的固化機(jī)理并對(duì)其砂漿進(jìn)行改性研究,進(jìn)一步為文物修復(fù)提供性能更優(yōu)的材料,本文從外界環(huán)境條件及水灰比對(duì)天然水硬性石灰水化與碳酸化過程的影響,及添加硅藻土、碳纖維對(duì)天然水硬性石灰砂漿性能的影響兩個(gè)方面開展研究。結(jié)果表明在90天的養(yǎng)護(hù)齡期內(nèi),水硬性石灰漿液養(yǎng)護(hù)過程中與外界的接觸狀況明顯影響其水化與碳酸化進(jìn)程,接觸不充分條件下養(yǎng)護(hù)90天時(shí)仍存在硅酸二鈣與氫氧化鈣；接觸充分時(shí)養(yǎng)護(hù)28天內(nèi)基本完成了水化反應(yīng),并且養(yǎng)護(hù)14天內(nèi)氫氧化鈣基本完成碳酸化反應(yīng)。水硬性石灰漿液試樣中氫氧化鈣的碳酸化速度大于水化硅酸鈣的碳酸化速度,水硬性石灰漿液的碳酸化作用促進(jìn)了其水化反應(yīng)。水灰比影響水硬性石灰初期水化反應(yīng)和碳酸化反應(yīng)。采用硅藻土替代部分水硬性石灰使得砂漿的密度減小,制備砂漿所用原料特別是水硬性石灰的總量減少,硅藻土的加入使得水硬性砂漿試樣的強(qiáng)度增加,提高了砂漿的耐酸性、耐凍融性及耐硫酸鈉膨脹性能,作用機(jī)理為硅藻土與砂漿中氫氧化鈣間發(fā)生了火山灰反應(yīng)。添加碳纖維及硅藻土改性碳纖維制備的水硬性石灰砂漿抗折強(qiáng)度有較大幅度提高。硅藻土對(duì)碳纖維起到了一定的表面改性作用,它可以與試樣中氫氧化鈣發(fā)生火山灰反應(yīng)改善碳纖維與砂漿基體之間的界面連接狀況而提高試樣的強(qiáng)度。添加減水劑大大提高了試樣的抗壓強(qiáng)度與抗折強(qiáng)度,主要原因?yàn)闇p水劑有利于砂漿基體分散均勻。
[Abstract]:The use of natural hydrated lime has a long history, and the application of natural hydrated lime has been reduced by a large number of cement applications. In recent years, due to the superiority of natural hydrated lime in the field of cultural restoration, its application has recovered. There are few studies on natural hydrated lime. In order to make clear the curing mechanism of natural hydro lime and study the modification of mortar, we can provide better material for restoration of cultural relic. In this paper, the effects of environmental conditions and water-cement ratio on the hydration and carbonation process of natural hydrated lime and the effects of adding diatomite and carbon fiber on the properties of natural hydrated lime mortar were studied. The results show that the contact with the outside world during the curing process of hydrated lime slurry affects the process of hydration and carbonation obviously during the 90 days of curing age, and dicalcium silicate and calcium hydroxide still exist in the condition of insufficient contact. The hydration reaction was basically completed within 28 days and the carbonation reaction of calcium hydroxide was basically completed within 14 days. The carbonation rate of calcium hydroxide in hydrated lime slurry was higher than that of calcium silicate hydrate, and the carbonation of hydrated lime slurry promoted the hydration reaction. The ratio of water to cement affects hydration and carbonation in the initial stage of hydrated lime. Using diatomite to replace part of hydrated lime reduces the density of mortar, reduces the total amount of raw materials, especially hydrated lime, and increases the strength of hydraulic mortar and improves the acid resistance of mortar. The mechanism of freezing and thawing resistance and swelling resistance of sodium sulfate is the reaction of pozzolanic ash between diatomite and calcium hydroxide in mortar. The flexural strength of hydro lime mortar prepared by adding carbon fiber and diatomite modified carbon fiber has been greatly improved. Diatomite has a certain surface modification effect on carbon fiber. It can react with calcium hydroxide in the sample to improve the interfacial connection between carbon fiber and mortar matrix and improve the strength of the sample. The compressive strength and flexural strength of the samples were greatly improved by adding water reducing agent, which was mainly due to the fact that the water reducing agent was favorable to the dispersion of mortar matrix.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ177.61

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