發(fā)布時(shí)間：2018-06-09 06:15

  本文選題：增效劑CTF + 減水劑�。� 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：研究了新型混凝土外加劑增效劑CTF與聚羧酸系(PCE)、萘系(FDN)、脂肪族(FAS)三種不同類型減水劑的有效復(fù)摻對(duì)水泥基材料性能的影響,并分析其作用機(jī)理；在外加劑復(fù)摻的基礎(chǔ)上,研究了常用礦物摻合料(粉煤灰、礦粉)與石灰石粉的多元復(fù)摻對(duì)混凝土性能的影響。主要研究?jī)?nèi)容和結(jié)果如下： 采用凈漿初始流動(dòng)性、流動(dòng)性經(jīng)時(shí)損失、漿體保水性、砂漿工作性以及膠砂強(qiáng)度等幾個(gè)常用指標(biāo)全面評(píng)價(jià)了CTF和不同減水劑復(fù)摻與水泥的相容性問(wèn)題,確定了CTF與減水劑復(fù)摻使用的可行性。 通過(guò)配制0.35和0.50兩個(gè)水膠比系列的混凝土,在不減少和減少10%基準(zhǔn)水泥用量的情況下,研究了CTF與減水劑復(fù)摻對(duì)混凝土強(qiáng)度的影響規(guī)律；結(jié)果表明：CTF的摻入可以在有效降低基準(zhǔn)水泥用量的同時(shí)提高混凝土的強(qiáng)度,CTF對(duì)混凝土強(qiáng)度的促進(jìn)作用主要集中在中后期。 通過(guò)測(cè)試水泥非常早期水化熱、水泥懸浮液電導(dǎo)率和水泥凈漿不同齡期的化學(xué)結(jié)合水量,研究了外加劑對(duì)水泥水化歷程的影響,并分析了水泥與外加劑的相互作用機(jī)理。結(jié)果表明：CTF和PCE減水劑促進(jìn)了第一放熱峰值的增加,FDN和FAS減水劑降低了第一放熱峰值,CTF與三種減水劑均不同程度地促進(jìn)了前45min累積放熱量的增加；CTF的摻入,促進(jìn)了水泥水化的離子溶出,增大了水泥懸浮液電導(dǎo)率,而三種減水劑則由于其本身電離的離子與水泥水化溶出的離子發(fā)生絡(luò)合反應(yīng),降低了水泥懸浮液的電導(dǎo)率；CTF與三種減水劑復(fù)摻均不同程度地提高了水泥水化樣品中后期的化學(xué)結(jié)合水量。 研究了石灰石粉、粉煤灰、礦粉的多元復(fù)摻以及CTF的摻入對(duì)混凝土工作性能、強(qiáng)度、耐久性能和微觀孔結(jié)構(gòu)的影響,并對(duì)摻合料混凝土孔結(jié)構(gòu)參數(shù)與抗氯離子滲透性能、抗碳化性能進(jìn)行了相關(guān)性分析。結(jié)果表明：在適宜摻量下,石灰石粉等量取代礦粉或粉煤灰,可以有效地改善混凝土的工作性能,且對(duì)強(qiáng)度影響不大,但石灰石粉的摻入使得混凝土孔結(jié)構(gòu)粗化,不利于混凝土的抗氯離子和抗碳化性能；CTF的摻入改善了摻合料混凝土的和易性和孔結(jié)構(gòu),提高了強(qiáng)度和耐久性能；摻合料混凝土的孔隙率和平均孔徑與抗氯離子滲透性能、抗碳化性能均有不同程度的關(guān)聯(lián),其中,在水膠比相同的情況下,無(wú)論混凝土的組成如何,孔隙率與混凝土抗碳化性能的相關(guān)程度很高,二次多項(xiàng)式相關(guān)系數(shù)高達(dá)0.9533。
[Abstract]:The effect of effective admixture of three different types of water-reducing agents, CTF, polycarboxylic acid series PCEC, naphthalene and aliphatic group FAS, on the properties of cement-based materials was studied, and the mechanism of the effects of CTF on the properties of cement-based materials was analyzed. The effect of mineral admixture (fly ash, mineral powder) and limestone powder on concrete properties was studied. The main contents and results are as follows: the initial fluidity of the pulp, the loss of the fluidity in time, and the water retention of the pulp. The compatibility of CTF and different superplasticizer with cement was comprehensively evaluated by several common indexes, such as the workability of mortar and the strength of cement. The feasibility of compound use of CTF and water reducer was determined. The effect of CTF and superplasticizer on the strength of concrete was studied by preparing two series of concrete with water binder ratio of 0.35 and 0.50 without reducing and reducing the dosage of 10% standard cement. The results show that the incorporation of% CTF can effectively reduce the amount of reference cement and increase the strength of concrete. The effect of CTF on the strength of concrete is mainly concentrated in the middle and late stage. The hydration heat of cement is tested in very early stage. The influence of admixture on cement hydration history was studied and the interaction mechanism between cement and admixture was analyzed. The results showed that the increase of the first exothermic peak value was promoted by the water reducing agent of 1: CTF and PCE. The first exothermic peak value was decreased by FDN and FAS superplasticizer. Both CTF and three water reducers promoted the increase of cumulative heat release of 45min in different degrees. It promotes the ion dissolution of cement hydration, increases the conductivity of cement suspension, and the three kinds of water reducer react with the ions of cement hydration because of their ionization ions. The conductivity of cement suspensions and the addition of CTF and three water reducers increased the chemical binding water of cement hydration samples in different degrees. The limestone powder, fly ash, lime stone powder and fly ash were studied. The effects of multicomponent addition of mineral powder and CTF on the performance, strength, durability and microstructure of concrete are discussed. The correlation between pore structure parameters and chloride ion permeation resistance and carbonation resistance of concrete admixtures is analyzed. The results show that the lime stone powder can effectively improve the working performance of concrete and has little effect on the strength of concrete, but the limestone powder can coarsening the pore structure of concrete by replacing the mineral powder or fly ash with the same amount of limestone powder. The incorporation of CTF improves the easiness and pore structure of admixture concrete, improves the strength and durability of concrete, and improves the porosity, average pore size and chloride ion permeability of admixture concrete. In the case of the same water-binder ratio, the correlation between porosity and carbonation resistance of concrete is very high, and the correlation coefficient of quadratic polynomial is 0.9533.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528.042.2

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本文編號(hào)：1999331