飛灰/兩性離子型複合水膠作為混凝土自養護劑的可行性研究
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2020
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Abstract
近年來，學者們提出使用吸水性材料作為自養護劑添加到混凝土中可以有效的改善混凝土的性質，因此本論文主要目的為製備一種飛灰/兩性離子型複合水膠(FA/PDA)作為混凝土的自養護劑，水膠使用丙烯醯胺(AM)、N,N-二甲基胺-3-β-羧基丙烯酸乙酯乙酸鈉鹽(DCA)和飛灰(FA)合成，合成後使用FT-IR光譜作結構鑑定和探討單體比例、起始劑劑量、交聯劑劑量、飛灰含量對於水膠在各種水溶液下吸水率的影響。
將FA/PDA水膠加到水泥砂漿和混凝土中，作為自養護劑時，探討水膠添加量及水膠內飛灰比例的含量，對於水泥砂漿和混凝土抗壓強度、內部濕度、乾縮量和自體收縮量的影響。
將FA/PDA水膠置於水溶液中，在吸水率在一開始會先快速的上升，然後趨於平穩後即達到飽和吸水率，實驗結果顯示，FA/PDA水膠，吸水率會隨AM比例、交聯劑劑量、起始劑劑量和飛灰含量增加而增加，當AM/DCA= 3 MBA= 0.3 mole%, APS= 0.5 mole%，FA = 15 wt%有最高的吸水率。
FA/PDA水膠在去離子水中、0.1M NaCl(aq)、0.1MCaCl2(aq)、Pore solution和水泥漿濾液中的最高的吸水率分別為398.07g/g 、129.63 g/g、116.5 g/g、116.38g/g、73.44 g/g。
將FA/PDA水膠加入水泥砂漿和混凝土中，抗壓強度隨著水膠量的添加而上升，當水膠劑量為0.2 wt%時有最高的強度，在添加不同種類的FA/PDA水膠發現，飛灰含量為15 wt%的FA/PDA水膠，對水泥砂漿和混凝土的抗壓強度和內部濕度增加、乾縮量和自體收縮量減少，有最好的提升效果。
In recent years, scientists have proposed that the use of absorbent materials as self-curing agents added to concrete can effectively improve the properties of concrete. Therefore, the main purpose of this paper is to prepare a fly ash/amphoteric ionic composite hydrogel (FA/PDA) as a self-curing agent for concrete, The hydrogel is synthesized using acrylamide (AM), N,N-dimethylamine-3-β-carboxyethyl acrylate sodium salt (DCA) and fly ash (FA). After synthesis, FT-IR spectroscopy is used as structure identification and discussion on the influence of monomer ratio, initiator dosage, crosslinking agent dosage, and fly ash content on the water absorption of water glue in various aqueous solutions. Discuss the amount of hydrogel added and the proportion of fly ash in the hydrogel, and the impact on the compressive strength, internal humidity, shrinkage and autogenous shrinkage of cement mortar and concrete, when FA/PDA hydrogel is added to cement mortar and concrete. The experimental results show that when the FA/PDA hydrogel is placed in an aqueous solution, the water absorption rate will increase rapidly at the beginning, and then reach the saturated water absorption rate after it stabilizes. The water absorption rate of the FA/PDA hydrogel will vary with the AM ratio, cross-linking agent dosage, initiator dosage and fly ash content increase with the increase. When AM/DCA= 3 MBA= 0.3 mole%, APS= 0.5 mole%, FA = 15 wt%, the highest water absorption rate. The highest water absorption rates of FA/PDA hydrogel in deionized water, 0.1M NaCl(aq), 0.1M CaCl2(aq), pore solution and cement slurry filtrate are398.07g/g 、129.63 g/g、116.5 g/g、116.38g/g、73.44 g/g, respectively When FA/PDA hydrogel is added to cement mortar and concrete, the compressive strength increases with the addition of the amount of hydrogel. When the amount of hydrogel is 0.2 wt%, it has the highest strength. When adding different types of FA/PDA The hydrogel found that the fly ash content of the hydrogel is 15 wt%, which has the best effect on increasing the compressive strength and internal humidity of cement mortar and concrete, as well as reducing the amount of dry shrinkage and self-shrinkage.
In recent years, scientists have proposed that the use of absorbent materials as self-curing agents added to concrete can effectively improve the properties of concrete. Therefore, the main purpose of this paper is to prepare a fly ash/amphoteric ionic composite hydrogel (FA/PDA) as a self-curing agent for concrete, The hydrogel is synthesized using acrylamide (AM), N,N-dimethylamine-3-β-carboxyethyl acrylate sodium salt (DCA) and fly ash (FA). After synthesis, FT-IR spectroscopy is used as structure identification and discussion on the influence of monomer ratio, initiator dosage, crosslinking agent dosage, and fly ash content on the water absorption of water glue in various aqueous solutions. Discuss the amount of hydrogel added and the proportion of fly ash in the hydrogel, and the impact on the compressive strength, internal humidity, shrinkage and autogenous shrinkage of cement mortar and concrete, when FA/PDA hydrogel is added to cement mortar and concrete. The experimental results show that when the FA/PDA hydrogel is placed in an aqueous solution, the water absorption rate will increase rapidly at the beginning, and then reach the saturated water absorption rate after it stabilizes. The water absorption rate of the FA/PDA hydrogel will vary with the AM ratio, cross-linking agent dosage, initiator dosage and fly ash content increase with the increase. When AM/DCA= 3 MBA= 0.3 mole%, APS= 0.5 mole%, FA = 15 wt%, the highest water absorption rate. The highest water absorption rates of FA/PDA hydrogel in deionized water, 0.1M NaCl(aq), 0.1M CaCl2(aq), pore solution and cement slurry filtrate are398.07g/g 、129.63 g/g、116.5 g/g、116.38g/g、73.44 g/g, respectively When FA/PDA hydrogel is added to cement mortar and concrete, the compressive strength increases with the addition of the amount of hydrogel. When the amount of hydrogel is 0.2 wt%, it has the highest strength. When adding different types of FA/PDA The hydrogel found that the fly ash content of the hydrogel is 15 wt%, which has the best effect on increasing the compressive strength and internal humidity of cement mortar and concrete, as well as reducing the amount of dry shrinkage and self-shrinkage.
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兩性離子型, 水膠, 合成, 飛灰, 砂漿, 混凝土, 抗壓強度, 内部濕度, 乾縮, 自體收縮, amphoteric, hydrogel, synthetic, fly ash, mortar, concrete, compressive, strength, internal humidity, dry shrinkage, autogenous shrinkage