新型聚羧酸系強塑劑對含飛灰水泥漿體流動行為的影響

黃宏隆(H.L. Huang)

指導教授 ： 許貫中

國立臺灣師範大學/理學院/化學系/碩士(2002年)

摘要

卜作嵐材料與強塑劑都是製作高性能混凝土的重要成份。本論文主要研究水泥、卜作嵐材料與強塑劑三者間之相容性(compatibility)。實驗材料包括第I型波特蘭水泥、飛灰與羧酸系強塑劑(PMAMP)，PMAMP係以甲基丙烯酸(MAA)與2-丙烯醯胺-2-甲基丙烷磺酸(AMPSA)為反應物，經自由基聚合反應而得。本研究探討PMAMP分子量、MAA / AMPSA比例、與飛灰燒失量等因素對於水泥漿體之迷你坍度、迷你坍度維持、視黏度、凝結時間的影響，並以強塑劑對漿體顆粒之吸附行為、表面電位等實驗來解釋之。
研究結果顯示添加重量平均分子量(Mw)為5.6 × 104者與MAA / AMPSA = 1 / 1的PMAMP之漿體迷你坍度最佳、視黏度最低，而添加Mw = 3.8×105與MAA / AMPSA = 3 / 2的PMAMP之漿體迷你坍度維持最佳。大體上，飛灰燒失量越低，漿體迷你坍度越佳；飛灰取代量越多時，若強塑劑AMPSA比例大於50%，則漿體迷你坍度、迷你坍度維持越佳。

關鍵字

羧酸系強塑劑 ； 卜作嵐 ； 分子量 ； 反應物比例 ； 燒失量 ； 吸附量

並列摘要

Pozzolan and superplasticizer are two important components in making high performance concrete. In this research, the compatibility between cement, pozzolan, and superplasticizer was studied.
Experimentally, type I Portland cement, fly ash, and carboxylate- based superplasticizer (PMAMP) were used. PMAMP was prepared from methacrylic acid (MAA) and 2-acrylamido-2-methylpropane sulfonic acid (AMPSA) through free radical copolymerization. The effects of the MAA / AMPSA ratio and molecular weight of PMAMP, and the ignition loss of fly ash on the mini-slump, mini-slump retention, apparent viscosity, and setting time of cement pastes (water / cement = 0.3) were investigated. The results were explained by the adsorption behavior of PMAMP on solid particles and the zeta potential of particles.
It is indicated that cement pastes containing PMAMP with MAA / AMPSA = 1 / 1, Mw (weight-average molecular weight) = 5.6 × 104, show the highest mini-slump, and lowest apparent viscosity. Cement pastes containing PMAMP with MAA / AMPSA = 3 / 2, Mw = 3.8 × 105, show the best mini-slump retention.
Generally, the mini-slump of cement pastes increases with decreasing ignition loss of fly ash. The more fly ash added, the higher the mini-slump and mini-slump retention of cement pastes containing PMAMP (with MAA / AMPSA = 1 or more).

並列關鍵字

carboxylate-based superplasticizer ； pozzolan ； molecular weight ； reactant ratio ； loss of ignition ； adsorption amount