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Production of geopolymer concrete using natural pozzolan: A parametric study

机译：使用天然火山灰生产地聚合物混凝土的参数研究

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摘要

An experimental investigation was undertaken to study the mechanical properties of geopolymer concrete (GPC), produced with Jordanian natural pozzolan (JNP) as base material and commercially available alkaline solution made of sodium silicate (NS) and sodium hydroxide (NH). GPC mixtures with limestone aggregates were proportioned considering various ratios of NSNH-to-JNP, and NS-to-NH, and concentrations of NH then tested for fresh and hardened properties using the technology currently used for conventional concrete. The compressive strength was determined over time for specimens that were either cured in laboratory air or dry cured in an oven for 24 or 48 h at three different curing temperatures (40, 80, and 120 degrees C) after 24 h of casting. Scanning Electron Microscopy (SEM) images were also taken for samples representing various GPC specimens and dry curing temperatures. The parameters considered in proportioning various GPC mixtures had significantly impacted strength; confirming the behavior observed in literature; with optimal mixtures achieving matured compressive strengths in excess of 30 MPa. Dry curing of GPC in an oven at 40 degrees C and 80 degrees C for less than 48 h imparted significant increase in compressive strength at 25% and 32% of that obtained at normal curing, in laboratory air, respectively. Extending dry curing period at the present temperatures beyond the first day after casting has resulted in a limited increase in compressive strength at 28 days. The present GPC mixtures demonstrated high early strength development exceeding 70% of ultimate strength at three days of dry curing. SEM pictures confirmed the behaviors noticed for compressive strength for GPC mixtures, prepared at various proportions or heat cured at various temperatures. (C) 2016 Elsevier Ltd. All rights reserved.
机译：进行了实验研究，研究了以约旦天然火山灰（JNP）为基础材料以及由硅酸钠（NS）和氢氧化钠（NH）制成的市售碱性溶液生产的地聚合物混凝土（GPC）的力学性能。考虑到各种比例的NSNH与JNP和NS与NH的比例，对具有石灰石骨料的GPC混合物进行配比，然后使用当前用于常规混凝土的技术测试NH的新鲜和硬化性能。铸件经过24小时后，在三种不同的固化温度（40、80和120摄氏度）下，在实验室空气中固化或在烘箱中干燥固化24或48 h的样品，随时间推移确定其抗压强度。还针对代表各种GPC标本和干固化温度的样品拍摄了扫描电子显微镜（SEM）图像。各种GPC混合物的配比中考虑的参数对强度有很大影响。确认文献中观察到的行为；最佳混合物可达到超过30 MPa的成熟抗压强度。在实验室空气中，GPC在40摄氏度和80摄氏度的烤箱中干燥固化少于48小时，其抗压强度分别显着提高，分别为正常固化时的25％和32％。将目前温度下的干固化时间延长到浇铸后的第一天之后，导致28天抗压强度的增加有限。在干燥固化三天后，本发明的GPC混合物显示出高的早期强度发展，超过极限强度的70％。 SEM照片证实了以不同比例制备或在不同温度下热固化的GPC混合物的抗压强度。 （C）2016 Elsevier Ltd.保留所有权利。

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