本文選題：自密實混凝土 + 鋼管自密實混凝土　； 參考：《清華大學》2013年碩士論文

【摘要】：本文通過試驗，，對聚羧酸減水劑配制自密實混凝土的性能試驗做出了研究。通過一定方法合成兩種聚羧酸減水劑，將兩種減水劑按照一個最優(yōu)的比例配合成一種涵蓋兩種聚羧酸優(yōu)點的減水劑，進而討論了該聚羧酸減水劑和膠凝材料的相容性規(guī)律，并通過自密實混凝土的強度試驗，得出了一組自密實混凝土的最佳配比。 合成高減水性聚羧酸的原材料中，對凈漿初始流動度、30min流動度、60min流動度以及凈漿流動度損失的影響因素是丙烯酸、甲基丙烯磺酸鈉以及丙烯酸羥乙酯。對砂漿初始流動度、60min流動度、流動度損失的影響因素是丙烯酸羥乙酯、丙烯酰胺、甲基丙烯磺酸鈉、雙氧水；通過試驗得出合成高保塑性聚羧酸減水劑所需的最佳引發(fā)劑摻量、引發(fā)試驗所需要的聚合溫度、保溫時間、聚合反應加料方法等。 通過試驗研究，為降低膠凝材料的用量，減小混凝土內部溫升，添加了粉煤灰和超細礦粉等礦物摻合料來增加自密實混凝土的后期強度和自密實性。通過正交試驗三水平四因素（水膠比，粉煤灰，超細礦粉，砂率）確定了自密實混凝土最優(yōu)配合比。 通過對自密實混凝土和易性的研究，得出影響自密實混凝土坍落度的最大因素是摻合料和砂率，其次是聚羧酸減水劑，最后是纖維素醚型增稠劑。對自密實混凝土坍落擴展度影響最大的因素是增稠劑，其次是聚羧酸減水劑，第三是砂率，最后是摻合料；對自密實混凝土坍落擴展時間影響最大的因素是聚羧酸減水劑，其次是砂率、增稠劑，最后為摻合料。 針對自密實混凝土體積穩(wěn)定性問題，本文通過試驗找出最優(yōu)的膨脹劑摻量，并在試驗中加入了SAP即吸水性樹脂，通過調整SAP和膨脹劑的摻量找出一個最優(yōu)方案使后期達到較好的膨脹效果。由于吸水性樹脂SAP能在自密實混凝土中起到蓄水池的作用，養(yǎng)護期間能夠源源不斷的提供水分，有利于膨脹劑發(fā)揮膨脹作用，彌補了混凝土自收縮，獲得良好的體積穩(wěn)定性，為自密實混凝土在鋼管中應用時避免脫空并達到協(xié)同工作提供了解決方案。
[Abstract]:In this paper, the properties of self-compacting concrete prepared by polycarboxylic acid superplasticizer are studied. Two polycarboxylic acid water reducers were synthesized by a certain method, and the two water reducers were combined in an optimal proportion to form a water reducing agent covering the advantages of two kinds of polycarboxylic acids. The compatibility of the polycarboxylic acid superplasticizer and the cementitious material was discussed. Through the strength test of self-compacting concrete, the optimum proportion of self-compacting concrete is obtained. In the raw materials for the synthesis of high water-reducing polycarboxylic acid, the factors affecting the initial fluidity of the pulp and the loss of the fluidity of the pulp for 30 min and 60 min are acrylic acid, sodium methacrylate sulfonate and hydroxyethyl acrylate. The factors affecting the flow loss of mortar are hydroxyethyl acrylate, acrylamide, sodium methpropylene sulfonate and hydrogen peroxide, and the optimum initiator dosage for the synthesis of high conserving plastic polycarboxylic acid water reducer is obtained. Polymerization temperature, holding time, polymerization reaction feeding method and so on. In order to reduce the amount of cementitious material and reduce the internal temperature rise of concrete, mineral admixtures such as fly ash and ultrafine mineral powder are added to increase the later strength and self-compactness of self-compacting concrete. The optimum mix ratio of self-compacting concrete was determined by orthogonal test with three water and four factors (water-binder ratio, fly ash, ultrafine ore powder, sand ratio). Through the study of self-compacting concrete and its easiness, it is concluded that the biggest factors affecting the slump of self-compacting concrete are admixture and sand rate, followed by polycarboxylic acid water-reducing agent, and finally cellulose ether thickener. The thickening agent is the most important factor affecting the collapse expansion of self-compacting concrete, followed by the polycarboxylic acid water reducer, the third is the sand rate, and the last is the admixture, and the most important factor affecting the collapse expansion time of the self-compacting concrete is the polycarboxylic acid water-reducing agent. Sand ratio, thickener, and admixture are the second. In order to solve the problem of volume stability of self-compacting concrete, the optimal amount of expansive agent was found out through experiments, and SAP was added to the test, that is, absorbent resin. By adjusting the content of SAP and expansion agent, an optimal scheme was found to achieve better expansion effect in the later stage. Because the water-absorbent resin SAP can act as a reservoir in self-compacting concrete, it can supply water continuously during curing, which is beneficial to the expansion of expansive agent, which makes up for the self-shrinkage of concrete and obtains good volume stability. It provides a solution for avoiding void removal and achieving cooperative work when self-compacting concrete is applied in steel pipe.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528

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本文編號：1805624