Abstract
The durability of reinforced concrete (RC) pipes depends upon the corrosion resistance of the reinforcing steel and the resistance of concrete mixes against an aggressive environment. This research paper aims to compare the performance of R.C. pipes made of ordinary Portland cement (OPC) concrete mixtures with others made of two different geopolymer concrete mixes based on different ratios of granulated blast furnace slag (GBFS), fly ash (FA), and pulverized red brick (RB) subjected to three different environments, ambient, tap water (TW), and an aggressive environment, and a solution of 10% magnesium sulfates + 5% chloride (MS-CL). An accelerated corrosion setup has been applied to accelerate the corrosion process in the tested samples. The evaluation of change of compressive strength of concrete and microstructure of different mixes was investigated too. Fourier transform infrared (FTIR) spectroscopy has been studied on all pipes. Geopolymer concrete mixes based on 90% GBFS and 10% RB show better results in all cases. Geopolymer concrete mixes based on 63% GBFS, 27% FA, and 10% RB increase the concrete compressive strength in the magnesium sulfate and chloride environment by 5% compared to tap water. It can be concluded that the geopolymer concrete mixes produced of 90% GBFS and 10% RB perform well under all environments, and its microstructure shows stable behavior in an aggressive environment.
Highlights
Water and sewer water pipes are usually exposed to highly aggressive media attacks.there is an increasing need for new construction materials distinguished by high durability under aggressive media attacks rather than ordinary Portland cement.The most common disadvantages of ordinary Portland cement are environmental pollution from gas emission during the cement industry, deterioration under aggressive media attacks, and high cost
The objective of the present research is to conduct an experimental study to investigate the different mixes of geopolymer mortar and concrete to achieve the optimum concrete mix for pipes
This study aims to present the significance of using geopolymer mixes in reinforced concrete (RC) pipes under an aggressive environment
Summary
Water and sewer water pipes are usually exposed to highly aggressive media attacks.there is an increasing need for new construction materials distinguished by high durability under aggressive media attacks rather than ordinary Portland cement.The most common disadvantages of ordinary Portland cement are environmental pollution from gas emission during the cement industry, deterioration under aggressive media attacks, and high cost. Water and sewer water pipes are usually exposed to highly aggressive media attacks. There is an increasing need for new construction materials distinguished by high durability under aggressive media attacks rather than ordinary Portland cement. The most common disadvantages of ordinary Portland cement are environmental pollution from gas emission during the cement industry, deterioration under aggressive media attacks, and high cost. Geopolymer binder can be used in waste-water and water pipes more than phase like in concrete as a construction material or in mortar as a rehabilitation material in waste-water and water pipes [1, 2]. Geopolymer composites have recently found wide use in many applications of constructions in addition to in repairing and strengthening buildings because of their high strength, environmental friendliness, and significant cost advantages [3,4,5]
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