Abstract

This study presents the strength development and characterisation of geopolymer mortars containing finely ground calcined perlite (GCP) as a precursor which is activated with sodium hydroxide (NaOH) solution. For this purpose, mortar specimens were produced with CEN standard sand, GCP, water and NaOH. The specimens subjected to heat curing after 24 h from casting and kept at an ambient temperature until the day of testing. The unit weight, ultrasound pulse velocity, flexural and compressive strengths of the mortar specimens were obtained after dry curing. The experimental results revealed that the mechanical properties of the mortars improved as the curing period and heat-curing temperatures increase, as well as increasing the concentration of NaOH. In addition, the characteristics of the mortars were determined by SEM/EDS and XRD analyses. According to the experimental results, the compressive strength of 37 MPa were obtained, and it is concluded that GCP can be used in geopolymer mortars owing to its abundance and appropriate chemical composition.

摘要

这项研究介绍了以细磨的煅烧珍珠岩（GCP）为前体并被氢氧化钠（NaOH）活化的地聚合物砂浆的强度发展和特性。为此，用CEN标准砂，GCP，水和NaOH生产了砂浆标本。铸件在浇铸24小时后进行热固化，并保持在环境温度下直至测试当天。干固后得到砂浆试样的单位重量，超声脉冲速度，抗弯强度和抗压强度。实验结果表明，随着固化时间和热固化温度的升高，以及NaOH浓度的增加，砂浆的力学性能得到改善。另外，通过SEM / EDS和XRD分析来确定灰浆的特性。