El Mir Abdulkader, Nehme Salem G, Assaad Joseph J
University of Balamand, Al Kourah, Lebanon.
Laboratory and Associate Professor, Budapest University of Technology and Economics, Budapest, Hungary.
Heliyon. 2020 Jan 6;6(1):e03165. doi: 10.1016/j.heliyon.2020.e03165. eCollection 2020 Jan.
Perlite is a natural glassy volcanic rock used in construction applications requiring improved lightweight, thermal, and acoustic properties. During processing of raw perlite (i.e., cutting and fractioning to different sizes), large amounts of powders are collected and stored as waste materials. This paper evaluates the effect of waste perlite (WP) powders on durability and long-term transport properties of self-consolidating concrete (SCC). Different mixtures prepared with 580 kg/m powder using various combinations of WP, limestone filler (LF), metakaolin (MK), and silica fume (SF) are tested over 2-years period. Test results showed that WP confers particular benefits to the SCC compressive strength and its evolution over time, particularly when used in combination with MK and SF. Water permeability, carbonation, and chloride ion migration curtailed when WP concentration reached 220 and 260 kg/m. In contrast, the resistance against freeze/thaw remarkably improved, given the pozzolanic reactions and porous nature of such powders that accommodated the disruptive expansive stresses resulting from frost attack.
珍珠岩是一种天然玻璃质火山岩，用于需要改善轻质、热学和声学性能的建筑应用中。在原生珍珠岩加工过程中（即切割并分级成不同尺寸），会收集大量粉末并作为废料储存。本文评估了废弃珍珠岩（WP）粉末对自密实混凝土（SCC）耐久性和长期运输性能的影响。使用WP、石灰石填料（LF）、偏高岭土（MK）和硅灰（SF）的各种组合，以580 kg/m³粉末制备不同混合物，并在两年时间内进行测试。测试结果表明，WP对SCC抗压强度及其随时间的发展具有特殊益处，特别是与MK和SF组合使用时。当WP浓度达到220和260 kg/m³时，水渗透性、碳化和氯离子迁移受到抑制。相比之下，由于此类粉末的火山灰反应和多孔性质能够承受冻融引起的破坏性膨胀应力，其抗冻融性显著提高。
