الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 103 |  |  |
| | | from | 103 | | |
Abstract
Alkali silica reaction ”ASR” is the most deteriorative properties of concrete containing reactive siliceous waste materials. Recently, by increasing awareness of environmental protection, green concretes are introduced by using eco-friendly materials in concrete to make sustainable concrete. Green concrete is very often and cheap to produce, because, waste products are used as a partial substitute for cement, reduce energy consumption, environmental impact, and natural resource use. Different waste materials can be used as aggregate such as glass which has been popularity studied as a substitution for coarse and fine aggregate and even cement [1]. Alkali –silica reaction is critical factor limiting using siliceous waste materials in concrete, where the amorphous silica is susceptible to attack by the alkaline pore solution in concrete to form an expansive gel causing severe cracking and damage. The reactivity of ASR depends on many factors; the most important factor is particle size of the particles. It should be stated that using of solid waste materials with different particle sizes range from millimeter, micrometer and nanometer can change their reactivity behavior. Recent researchers stated that even a highly alkali silica reactive aggregate behave as a pozzolan when finely ground [2-3]. The aim of this research is to investigate the effect of particle size and the reactivity behavior of the reactive silica from siliceous industrial waste materials ”waste glass & slag” in concrete. Different particle mass will be investigated, where= these materials were used as fine aggregate replacement or substitute for cement to understand the mechanisms of ASR and its suppression. Common Two rations of fine aggregate replacement 50% and 80% are studied for either using waste glass or slag. Also with respect to using waste materials as cement replacement the common ratio of substitution is 30% for glass, 60% for slag. Standard Test Method for potential Alkali Reactivity of Aggregates (ASTM C1260) and (TGA) Thermo gravimetric analysis will be performed for different particle sizes of siliceous industrial waste materials. Compressive strength was measured to evaluate the effect of using these waste materials on hardened concrete properties. The results show that using glass as fine aggregate causes highly ASR expansion, and this reaction can be suppress or stopped by using glass as fine aggregate with cement has 30% fine glass replacement. The ASR expansion decreased with smaller glass particle size, where by increasing the fineness of glass ASR expansion stopped. On the other hand, no ASR expansion was found when using slag either as fine aggregate< or as cement replacement.