本文選題：聚羧酸系減水劑 + 可溶性堿　； 參考：《安徽建筑大學(xué)》2015年碩士論文

【摘要】：聚羧酸系減水劑(Polycarboxylate-based Superplasticizer,簡(jiǎn)稱PC)是由含有羧酸的不飽和單體以及其他單體共聚而成的,是一類具有特定結(jié)構(gòu)和性能的聚合物的總稱。這類減水劑的共同特點(diǎn)是主鏈中含有一定數(shù)量的羧基官能團(tuán),分子結(jié)構(gòu)呈線形、梳狀或多枝狀,具有高減水率、優(yōu)異的保塑性能,且能使混凝土具有良好的物理力學(xué)性能。通過(guò)自由基聚合合成了一種新型聚醚型聚羧酸減水劑(PC-1),將其與聚酯型聚羧酸減水劑(PC-2)進(jìn)行對(duì)比研究,主要比較這兩類PC與水泥的相容性。通過(guò)摻加K2CO3來(lái)改變水泥漿體中可溶性堿含量,研究可溶性堿含量對(duì)摻不同類型PC的水泥凈漿流動(dòng)性能、顆粒表面zeta電位、水化進(jìn)程、以及其他性能的影響。主要研究工作分述如下:(1)聚醚型聚羧酸減水劑的合成研究:以烯丙基聚乙二醇(APEG)、烯丙基磺酸鈉(SAS)、丙烯酸(AA)為主要原料,合成了一種新型聚醚型PC。分別研究了引發(fā)劑用量、單體比例、反應(yīng)溫度、聚合時(shí)間等因素對(duì)聚合產(chǎn)物分散性能的影響。通過(guò)進(jìn)一步正交試驗(yàn)確定了最佳合成工藝參數(shù)為:n(AA):n(APEG):n(SAS)=18:9:13,引發(fā)劑用量為1.5%,反應(yīng)溫度為80℃,聚合時(shí)間為8h。(2)可溶性堿對(duì)PC與水泥相容性的影響:比較不同摻量的PC-1和PC-2對(duì)水泥凈漿流動(dòng)性能的影響,分析二者對(duì)水泥顆粒的分散作用機(jī)理。通過(guò)摻加K2CO3來(lái)改變漿體可溶性堿含量,研究可溶性堿含量對(duì)摻不同類型PC的水泥凈漿流動(dòng)性能的影響。結(jié)果表明:PC-1與水泥的相容性要明顯優(yōu)于PC-2,其飽和摻量點(diǎn)更低,能使?jié){體初始流動(dòng)度高,且流動(dòng)度經(jīng)時(shí)損失小。當(dāng)PC-1或PC-2摻量低于其飽和摻量時(shí),適當(dāng)增加可溶性堿含量對(duì)PC-1與水泥相容性的影響不大,卻能明顯提高PC-2與水泥的相容性,增強(qiáng)漿體的流動(dòng)性能。(3)可溶性堿對(duì)摻不同類型PC的水泥水化反應(yīng)的影響:研究了可溶性堿與PC的共同作用對(duì)水泥水化熱的影響,并分別對(duì)水化產(chǎn)物進(jìn)行了XRD和SEM分析。結(jié)果表明:摻PC-1或PC-2都能使水泥水化放熱速率增大,適當(dāng)增加可溶性堿可以降低摻PC-1或PC-2水泥的水化放熱速率以及放熱量。PC-1和PC-2都能促進(jìn)水泥的早期水化,增加可溶性堿含量都能在一定程度上加快摻PC-1或PC-2的水泥水化進(jìn)程,能使硬化水泥結(jié)構(gòu)更加致密,有利于水泥石早期強(qiáng)度的發(fā)展。(4)PC與可溶性堿對(duì)水泥性能的影響:研究了可溶性堿與PC的共同作用對(duì)水泥凝結(jié)時(shí)間、水泥石孔徑分布以及硬化后水泥石抗折、抗壓強(qiáng)度的影響。結(jié)果表明:當(dāng)PC-1摻量較低時(shí),少量可溶性堿對(duì)漿體有緩凝效應(yīng),當(dāng)PC-1摻量較高時(shí),可溶性堿對(duì)漿體則表現(xiàn)出一定的促凝效應(yīng);而對(duì)于摻PC-2的漿體而言,可溶性堿對(duì)漿體有很強(qiáng)的促凝效應(yīng)。PC-1能使水泥石最可幾孔徑增大,可溶性堿能使摻PC-1的水泥石孔容大幅下降,有利于水泥石強(qiáng)度的發(fā)展;而PC-2對(duì)水泥石孔徑分布影響不大,可溶性堿對(duì)摻PC-2的水泥石強(qiáng)度的提高也不明顯。當(dāng)PC-1或PC-2的摻量為0.04%,可溶性堿摻量為0.36%~0.48%時(shí),有利于水泥石抗折、抗壓強(qiáng)度的提高。本論文的研究工作揭示了可溶性堿對(duì)不同類型PC與水泥相容性的影響規(guī)律,拓寬了PC的應(yīng)用范圍,對(duì)實(shí)際工程建設(shè)有一定的指導(dǎo)意義。
[Abstract]:Polycarboxylate-based Superplasticizer (PC) is formed by the copolymerization of unsaturated monomers and other monomers containing carboxylic acids. It is the general name of a class of polymers with specific structures and properties. The common characteristic of this kind of water reducing agent is that the main chain contains a certain number of carboxyl functional groups and the molecular structure is linear. A new polyether polycarboxylic acid water reducer (PC-1) was synthesized through free radical polymerization. The ratio of the polycarboxylic acid water reducing agent (PC-2) to polyester type polycarboxylic acid water reducing agent (PC-2) was studied, and the compatibility of the two kinds of PC with cement was compared. The content of soluble alkali in cement paste was changed by adding K2CO3, and the effects of soluble alkali content on the flow performance, zeta potential, hydration process and other properties of cement mixed with different types of PC were studied. The main research work is as follows: (1) synthesis of polyether polycarboxylic acid water reducing agent: allyl polyethylene glycol (APEG) A new polyether type PC. was synthesized with sodium allyl sulfonic acid (SAS) and acrylic acid (AA) as the main raw material. The influence of the dosage of initiator, monomer ratio, reaction temperature and polymerization time on the dispersion properties of the polymerization products was studied. The optimum synthetic parameters were determined by further orthogonal test: n (AA): n (APEG): n (SAS) =18:9:13. The dosage of the agent is 1.5%, the reaction temperature is 80 C, the polymerization time is 8h. (2) and the effect of soluble alkali on the compatibility of PC and cement: the effect of different dosage of PC-1 and PC-2 on the flow performance of cement paste is compared, and the dispersing mechanism of the cement particles is analyzed. The soluble alkali content of the slurry is changed by adding K2CO3, and the soluble alkali content is studied. The effect of quantity on the flow performance of cement paste with different types of PC shows that the compatibility of PC-1 and cement is obviously better than that of PC-2, and its saturation content is lower, and the initial flow degree of the slurry is higher and the time loss of flow is small. When the content of PC-1 or PC-2 is lower than its saturated content, the compatibility of soluble alkali content is appropriately increased to the compatibility of PC-1 with cement. The effect of sex is not significant, but it can obviously improve the compatibility of PC-2 with cement and enhance the flow performance of the slurry. (3) the effect of soluble alkali on the hydration of cement mixed with different types of PC: the effect of the joint action of soluble alkali and PC on the hydration heat of cement, and the analysis of the hydration products by XRD and SEM respectively. The results show that PC-1 or P is added. C-2 can increase the heat release rate of cement hydration, the appropriate increase of soluble alkali can reduce the hydration heat rate of PC-1 or PC-2 cement, and the heat release.PC-1 and PC-2 can promote the early hydration of cement. The increase of soluble alkali content can accelerate the hydration process of PC-1 or PC-2 cement to a certain extent, and can make the hardened cement structure more structure. In addition, it is beneficial to the development of early strength of cement stone. (4) the effect of PC and soluble alkali on the performance of cement: the effect of the joint action of soluble alkali and PC on the cement setting time, pore size distribution of cement stone and the compressive strength of cement stone after hardening. The results show that a small amount of soluble alkali can have a small amount of soluble alkali to the slurry when the amount of PC-1 is low. When the content of PC-1 is high, the soluble alkali has a certain accelerating effect on the slurry when the content of the mixture is high. For the slurry with PC-2, the soluble alkali has a strong effect on the slurry,.PC-1 can increase the pore size of the cement stone, and the soluble alkali can greatly decrease the cement Shi Kongrong content of the PC-1, which is beneficial to the development of the strength of cement stone. And PC-2 has little effect on the pore size distribution of cement stone, and the increase of the strength of the cement stone with PC-2 is not obvious. When the dosage of PC-1 or PC-2 is 0.04% and the soluble alkali content is 0.36%~0.48%, it is beneficial to the flexural strength and the increase of the compressive strength of the cement stone. The influence rule of sex broadens the application scope of PC, and has certain guiding significance for practical engineering construction.

【學(xué)位授予單位】：安徽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.1

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