Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34467
標題: A Study on Characteristics of Interface Transition Zone of Rubberized Concretes
橡膠混凝土界面轉移區特性之研究
作者: 周良勳
Chou, Liang-Hsiung
關鍵字: Rubberized concrete
橡膠混凝土
film flow
disjoining pressure
膜流
離分壓
出版社: 水土保持學系所
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摘要: The use of granular rubber as an aggregate or additive to concrete has been studied for a long time. Previous research results showed the aggregating rubber could increase concrete's flexibility, elasticity, and capacity to absorb energy. It is suggested that the rubberized concrete can be used, for example, in highway constructions as a shock absorber, or in sound barrier as sound absorber, or in building as earthquake shock-wave absorber, or in impact prevention structure such as Jersey barriers. It is believed that such concrete can also be used in the soil and water conservation construction materials. For resource reutilization, scrap-tire has long been used together with concrete after proper chemical mixing procedures to form rubberizd concrete for various applications with promising results. However, addition of rubber particles leads to degradation of physical properties of the concrete, particularly, the compressive strength. The experiments conducted for this study was to help to understand and to solve this problem. The results of experiments discovered that the loss in compressive strength is due to local imperfection in hydration of cement, induced by addition of heterogeneous rubber particles. Microscopic studies showed that the rubber particles disturbed the water transfer to create channels, which are prone to cracking and lead to loss in the compressive strength. However no cracking was found along the surfaces of the rubber particles, indicating that the bonding strength between rubber particles and cement phases is not the critical factor in determining the compressive strength. A theoretical model was proposed to describe the water transfer in the specimens; This model is useful in understanding the mechanisms of decrease in compressive strength due to addition of rubber particles and the improvement in compressive strength through modification of particle surfaces. To improve the compressive strength, the Hamaker constant must be maximized. The Hamaker constant for water film on rubber particle surfaces is smaller than that on the hydrated cement particles; therefore the water transfer rate is lower in the presence of rubber particles. Thus, one of the approaches to improve the compressive strength of concrete is to increase the Hamaker constant of the system.
橡膠混凝土為使用橡膠材料添加到混凝土所構成之複合材料。因其具有彈性、韌性及耐衝擊等特性,長久以來一直為研究開發的焦點。其應用領域從吸音材料、耐震材料到耐衝擊的紐澤西護欄等。又因其較傳統混凝土有較佳的疏水、防水特性,應可應用於水土保持工程。 本研究目的旨在探討橡膠混凝土界面轉移區之特性、進而設法改善橡膠與水泥漿體界面間之結合能力,以提高橡膠混凝土之機械強度,增加水土保持工程結構物之使用效能。實驗主要將廢輪胎橡膠先破碎處理後添加到水泥與砂之混合料中,再加水進行水化反應形成橡膠混凝土。水化過程以金相顯微鏡做為即時觀察樣品表面變化情形。此外並依標準規範進行抗壓、抗拉與抗彎等機械性質測試。實驗結果顯示,水泥漿體因添加橡膠而影響其水化作用,因而造成橡膠混凝土功能之降低。為解決此問題,本研究透過液膜傳輸模式進行橡膠表面改質方法。理論模式之建立係考慮逐漸硬化的水泥漿體內,水分由液膜傳輸到尚未完全水化的水泥表面,再經滲透作用進入水泥顆粒內進行水化反應。當液膜厚度小於100nm時,離分壓主導液膜內水分傳輸量的大小。模擬結果顯示橡膠顆粒的添加會改變Hamaker常數的大小,進而影響水份傳輸的速率。經由橡膠表面改質提高Hamaker常數,有利改善液膜不穩定的現象,避免阻礙水分傳輸,因而改善混凝土之機械性質。由之實驗及結果證實,所提出之理論可以應用於解釋橡膠混凝土界面轉移區之特性,另外亦證實以NaOH處理之橡膠顆粒表面改質方法可有效改善混凝土之機械性質。
URI: http://hdl.handle.net/11455/34467
其他識別: U0005-2808200623293000
Appears in Collections:水土保持學系

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