本文選題：纖維素醚（HPMC）　切入點：可分散乳膠粉　出處：《濟南大學》2013年碩士論文

【摘要】：隨著建筑技術(shù)發(fā)展，人們對施工效率、環(huán)境保護及建筑質(zhì)量提出了更高要求，工業(yè)化生產(chǎn)的預拌砂漿得到快速發(fā)展。為改善砂漿工作性，纖維素醚、可分散乳膠粉、纖維、減水劑等作為添加劑，在預拌砂漿中起到必不可少的作用。砂級配是影響砂漿質(zhì)量的關(guān)鍵因素，如何利用添加劑彌補砂級配不合理對砂漿性能的影響也是需要面對的課題。 本實驗分別研究了纖維素醚（HPMC）、可分散乳膠粉、纖維、減水劑及砂顆粒組成對砂漿性能的影響規(guī)律，主要研究結(jié)果如下： （1）添加HPMC可提高砂漿保水率，降低稠度損失率，延長凝結(jié)時間。添加0.3%HPMC，可提高砂漿保水率達到94%，稠度損失率低于10%；砂漿折壓比隨齡期增長先降低后增加，在28d時折壓比最小，添加HPMC砂漿后期折壓比增長更為顯著，添加0.2%HPMC，砂漿28d折壓比均高于0.35；砂漿凝結(jié)時間隨HPMC粘度增加而增大，，添加0.5%H1凝結(jié)時間延長至900min；添加H4砂漿56d、108d基本無收縮，但是纖維素醚摻量、粘度過大會增加砂漿收縮率。HPMC的加入會大幅降低砂漿強度和流動度。 （2）添加膠粉，砂漿強度會出現(xiàn)一定程度降低，韌性得到明顯改善，添加P1、P2、P3、P4、P5分別在1.0%、1.5%、2.0%、1.0%、2.0%時，對砂漿韌性改善效果最顯著，折壓比分別達到0.26、0.28、0.29、0.29、0.30；粘結(jié)強度隨膠粉摻量增加而增加，摻加0.2%P1和P5分別達到0.036MPa、0.035MPa。 （3）隨纖維摻量增加，開裂面積和強度降低，砂漿需水量增加，砂漿韌性得到改善，其中以長徑比最大的9mm聚丙烯纖維和木纖維改善效果最好，摻量在0.3%時，28d折壓比分別達到0.33、0.30，9mm聚丙烯纖維和木纖維分別在0.3%和0.05%時砂漿收縮率最低。 （4）聚羧酸減水劑在單一粒徑砂配制砂漿中起不到減水作用，相反會增加砂漿離析泌水。＜0.3mm粒徑砂添加減水劑、HPMC對砂漿強度沒有明顯的改善效果，0.3mm-0.6mm、0.6mm-1.18mm與1.18mm-2.36mm粒徑砂同時添加減水劑與HPMC，相對單摻其中一種，強度和韌性改善更為顯著，28d抗壓強度分別達到5.1MPa、8.1MPa、7.7MPa，抗折強度分別為2.2MPa、2.8MPa、2.5MPa；無論添加減水劑、HPMC與否，由0.6mm-1.18mm粒徑砂配制的砂漿強度最大。 （5）成功復配砂漿添加劑，使其對不同細度模數(shù)砂配制的砂漿保水率及韌性改善都優(yōu)于市售砂漿添加劑。
[Abstract]:With the development of building technology, higher requirements for construction efficiency, environmental protection and building quality have been put forward, and ready-mixed mortar produced in industrial production has developed rapidly. In order to improve the workability of mortar, cellulose ether can disperse latex powder and fiber, As additives, water-reducing agents play an essential role in ready-mixed mortar. Sand gradation is a key factor affecting mortar quality, and how to make up for the influence of additive on mortar performance is also a problem to be faced with. In this experiment, the effects of cellulose ether, dispersible latex powder, fiber, water reducer and sand particle composition on the properties of mortar were studied. The main results are as follows:. (1) adding HPMC can increase the water retention rate of mortar, reduce the loss rate of consistency and prolong the setting time. Adding 0.3HPMCcan increase the water retention rate of mortar up to 94and the loss rate of consistency is lower than 100.The ratio of break to pressure of mortar decreases first and then increases with the increase of age, and the ratio of broken pressure to pressure is the smallest at 28 days. In addition of 0.2HPMC, the ratio of break to pressure was higher than 0.35 in 28 days. The setting time of mortar increased with the increase of HPMC viscosity, and the setting time of adding 0.5%H1 was prolonged to 900min, and H4 mortar had no shrinkage at 56d ~ 108d. However, the addition of cellulose ether and viscosity increased the shrinkage of mortar. HPMC significantly reduced the strength and fluidity of mortar. (2) the strength of mortar decreases to a certain extent and the toughness of mortar is improved obviously by adding rubber powder. When adding P1P2P2P3P3P4P5, the mortar toughness is improved most obviously at 1.0%, 1.5% and 2.0%, respectively, with a ratio of 0.260.280.290.290.0.30, and the bond strength increases with the increase of the content of rubber powder, and the strength of the mortar increases with the increase of the content of rubber powder. The strength of the mortar increases with the increase of the content of rubber powder, and the ratio of bending to pressure is 0.260.280.280.290.290.30, respectively. The addition of 0.2%P1 and P5 reached 0.036 MPA and 0.035 MPA, respectively. 3) with the increase of fiber content, the cracking area and strength decrease, the water requirement of mortar increases, and the toughness of mortar is improved. Among them, 9mm polypropylene fiber and wood fiber with the largest aspect ratio have the best effect. The shrinkage of mortar was the lowest when the ratio of 0.33 ~ 0.30 ~ 9 mm polypropylene fiber and wood fiber reached 0.33 ~ 0.30 ~ 9mm and 0.05% respectively at 0.3d / 28d when the content was 0.3% and 0.05% respectively. (4) polycarboxylic acid water reducer can not reduce water in single size sand. On the contrary, the segregation and bleeding of mortar will be increased. < 0.3mm particle size sand adding water reducer has no obvious improvement effect on mortar strength. The addition of water reducer and 1.18mm-2.36mm particle size sand together with 0.3mm-0.6mm-1. 18mm is relatively only mixed with one of them. The compressive strength and flexural strength of the mortar were 5.1MPa / 8.1MPa / 7.7MPa and 2.2MPa / 2.8MPa / 2.5MPa, respectively, and the strength of mortar prepared with 0.6mm-1.18mm particle size sand was the highest, regardless of adding water reducer or not. 5) the water retention and toughness improvement of mortar prepared with different fineness modulus sand is better than that of commercial mortar additive.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU578.1

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