Investigating permeability, capillary water absorption and weight loss in geopolymer concrete contains slag, nanosilica and polyolefin fibers

The environmental effects and the high consumption of fossil fuels in the production process of ordinary cement caused scientists to think of finding an alternative material for cement in concrete. In this regard, in the last few decades, geopolymer concrete production as a Novin was noticed by researchers in the construction industry, in the production of this type of concrete, aluminosilicate materials and active alkali solution replace cement and water, and they produce concrete with strength and strength beyond ordinary concrete. In this article, the durability properties of geopolymer-cement concrete containing 0-8% nano-silica and 1-2% polyolefin fibers have been investigated. Water capillary and weight loss were placed, also XRF and XRF spectroscopy were used to check the microstructure of the samples. The obtained results indicated the improvement of performance of concrete samples with the addition of silica nanoparticles and polyolefin fibers compared to the results of concrete containing Portland cement, microstructural investigations also confirmed the obtained results. The best performance in the results of water permeability and capillary absorption tests belonged to the age of 90 days of geopolymer concrete (containing 8% nanosilica and 2% fibers), which showed 56% and 65% improvement, respectively, compared to The control concrete was selected and the geopolymer concrete sample containing 92% slag and 8% nanosilica had the lowest weight loss of 6% after applying high heat.