含氯離子混凝土之工程性質研究

Abstract

近年來由於國家在各方面的建設迅速成長，造成工程資源的供不 應 求，大量開採河川砂石而使蘊藏量日趨枯竭；另一方面，台灣四面 環海 ，海砂蘊藏量相當豐富，但海砂含過高之鹽分及氯離子，對混凝 土之工 程性質有不良的影響，故含氯離子混凝土之工程性質為本研究 所探討之 重心。 本文藉 添加不同氯離子含量以瞭解對混凝土之抗壓強度與動彈性 係數之影響， 爐石粉取代水泥量以期望增加其耐久性，並以水溶法與 酸溶法量測氯離 子在混凝土中之含量，使含氯離子混凝土在適當環境 得以正確的使用， 藉以減輕砂源缺乏問題。 由研究結果顯示 ，混凝土早期抗壓強度與動彈性係數皆因氯離子 之添加而增高，且二者 有相似之發展趨勢。由水溶法與酸溶法量測氯 離子濃度之比例隨時間延 長而遞減，惟水灰比小者或水中養護者之試 體，其游離型氯離子濃度降 低量較大。 Nowadays the rapid growth of the construction, in every respect, of our country result in the shortage of engineering resources. Utilization of great amount of sand from rivers makes river sand defficient day by day. On the other hand, Taiwan is an island and it is around by the seas. There is a tremendous amount of sea sand. As for the sea sand, it contains much salt and chloride ion. As engineering resources, sea sand has the bad effect upon the guality of civil engineering. Therefore, it is the essential purpose of this paper that aim at the idea to resolve the problem of chloride ion containing concrete. Addition of chloride ion in different kind of concentrations into concrete in order to understand it*s influence upon the compressive strength and dynamic modulus of elasticity of concrete is the essential aim of this paper. Addition of slag to replace a part of cement in concrete might increase the durability of concrete. Water soluble chloride process and acid soluble chloride process are the common used methods for the determination of chloride ion concentration in concrete. These methods enable the chloride containing concrete that it might be used under proper condition in order to resolve the problem of shortage of sand supply in civil engineering. It also indicates that these two properties have alike developing tendency.The ratio of chloride ion concentration in the determination by water soluble chloride process and acid soluble chloride process may decrease smutaneously according to the elongation of time. But the sample that coming from water cement ratio or water curing process shows much lowing concentration of chloride ion.