Alkali-Silica Reactivity and Strength of Mortars with Expanded Slate, Expanded Glass or Perlite  

作　　者：Mehrzad Zahabi Aly Said Mehrzad Zahabi;Aly Said(Design Engineer, McNamara Salvia Structural Engineers, Boston, MA, USA;Associate Professor, Department of Architectural Engineering, The Pennsylvania State University, University Park, PA, USA)

机构地区：[1]Design Engineer, McNamara Salvia Structural Engineers, Boston, MA, USA [2]Associate Professor, Department of Architectural Engineering, The Pennsylvania State University, University Park, PA, USA

出　　处：《Open Journal of Civil Engineering》2021年第1期119-133,共15页土木工程期刊（英文）

摘　　要：Lightweight aggregates are increasingly used in concrete construction. They reduce concrete selfweight furnishing a structural advantage. In contrast, the mechanical properties and durability of lightweight concrete can become the governing factor on lightweight aggregate replacement ratios. Alkali-Silica Reactison (ASR) and compressive strength of mortar samples with expanded slate, expanded glass or perlite, covering the spectrum of internal porosity and weight of lightweight aggregates, were evaluated. Scanning electron microscopy was utilized to evaluate the contribution of the aggregates’ porosity and chemical composition in inhibiting ASR. Perlite, owing to its highly porous microstructure and lower matter excelled in ASR expansion while chemical composition and denser microstructure of the heavier expanded slate resulted in more signified late ASR expansion and higher compressive strength. An attempt in visual inspection of ASR attack of alkali metal ions on silica-rich expanded glass using an ultra-accelerated exposure to sodium hydroxide solution was made</span></span><span style="font-family:Verdana;">.Lightweight aggregates are increasingly used in concrete construction. They reduce concrete selfweight furnishing a structural advantage. In contrast, the mechanical properties and durability of lightweight concrete can become the governing factor on lightweight aggregate replacement ratios. Alkali-Silica Reactison (ASR) and compressive strength of mortar samples with expanded slate, expanded glass or perlite, covering the spectrum of internal porosity and weight of lightweight aggregates, were evaluated. Scanning electron microscopy was utilized to evaluate the contribution of the aggregates’ porosity and chemical composition in inhibiting ASR. Perlite, owing to its highly porous microstructure and lower matter excelled in ASR expansion while chemical composition and denser microstructure of the heavier expanded slate resulted in more signified late ASR expansion and higher compressive strength. An attempt in visual inspection of ASR attack of alkali metal ions on silica-rich expanded glass using an ultra-accelerated exposure to sodium hydroxide solution was made</span></span><span style="font-family:Verdana;">.

关 键 词：Lightweight Concrete Alkali-Silica Reaction Expanded Glass Aggregate Expanded Slate Aggregate Perlite Aggregate 

分 类 号：TU5[建筑科学—建筑技术科学]