Lightweight geopolymer concrete using pumice and glass fiber

This research is a study in which many different parameters are considered together in order to better understand the strength and durability properties of lightweight geopolymer concrete (LWGPC). Volcanic pumice aggregate, which has an important place in the production of lightweight concrete, has been replaced by coarse aggregate at the rates of 25%, 50% and 75%. Second, glass fiber was added as a fraction of volume by weight at 0.5%, 1%, 2%, and 3%. The lengths of the glass fibers of 3, 6 and 12 mm were used. Other variable is the change of NaOH molarity. In addition to the most commonly used 12M, 11M and 13M were also tested in the research. As a result of the experiments, approximately 27 MPa compressive strength and 14 MPa flexural strength were obtained with the addition of 25% pumice aggregate. While 1% and 2% glass fiber additives exhibited good compressive and flexural performance, in the NaOH molarity effect test, the highest compressive strength was obtained with 12M, while the highest flexural strength was obtained with 13M. Concentrations of 12 and 13M did not cause any problems in terms of precipitation, workability and setting time, but the best results were obtained with M12. Using molarity of 11M should be avoided. This study, in addition to making significant contributions to the environmental impact of LWGPC concrete, shows that using 25% pumice compressive strength over 25 MPa can be obtained.