Eco-Friendly Rubberized Concrete

Eco-Friendly Rubberized Concrete Sidi Mohammed Khalil CHERIF LOUAZANI, Graduate Research Assistant, Graduate Student in Construction Management, Construction management Department, CoACM Amaal Al Shenawa, Ph. D., Assistant Professor, Construction management Department, CoACM Metin Oguzmert, Ph. D., Associate Professor, Department of Civil and Environmental Engineering, SPCEET Tire waste (rubber) causes serious environmental issues because of the rapid rise in and numerous variations of modern developments worldwide. According to the U.S. EPA, 9.16 million tons of rubber and leather was generated in the U.S. in 2018, more than 50% ends in the landfill, while just 1.67 million tons, or about 18 % was recycled. With recycling rates in the U.S. remaining low, there is a strong need to find other ways to keep rubber waste out of the landfill. Using rubber waste in concrete not only conserves raw materials but also provides an alternative to landfilling or burning, the latter of which increases CO2 emissions and releases hazardous gases. Using recycled rubber aggregate lightens concrete, increases its workability, and improves its ductility. In this research, tire waste (recycled rubber) aggregate used to replace fine aggregate in concrete mixture up to 40%. Its impact on the physical and mechanical properties of concrete was examined. The experimental results showed improvement in the workability and unit weight while dropping in the compressive strength with increasing replacement ratios

Effectiveness of Fillers for Corrosion Protection of AISI-SAE 1018 Steel in Sea Salt Solution

Corrosion represents the single most frequent cause for product replacement or loss of product functionality with a 5% coat to the industrial revenue generation of any country in this dissertation the efficacy of using filled coatings as a protection coating are investigated. Fillers disrupt the polymer-substrate coating interfacial area and lead to poor adhesion. Conflicting benefits of increasing surface hardness and corrosion with long term durability through loss of adhesion to the substrate are investigated. The effects of filler type, filler concentration and exposure to harsh environments such as supercritical carbon dioxide on salt water corrosion are systematically investigated. The constants maintained in the design of experiments were the substrate, AISI-SAE 1018 steel substrate, and the corrosive fluid synthetic sea salt solution (4.2 wt%) and the polymer, Bismaleimide (BMI). Adhesion strength through pull-off, lap shear and shear peel tests were determined. Corrosion using Tafel plots and electrochemical impedance spectroscopy was conducted. Vickers hardness was used to determine mechanical strength of the coatings. SEM and optical microscopy were used to examine dispersion and coating integrity. A comparison of fillers such as alumina, silica, hexagonal boron nitride, and organophilic montmorillonite clay (OMMT) at different concentrations revealed OMMT to be most effective with the least decrease in adhesion from filler-substrate contact. Subsequently examining filler concentration, a 3 wt% OMMT was found to be most effective. A comparison of unmodified and modified BMI with 3 wt% OMMT exposed and not exposed to supercritical carbon dioxide showed that the BMI provided better corrosion protection; however, OMMT provided better wear, shear, and hardness performance

Effect of supercritical CO2 on salt water corrosion and wear resistance of bismaleimide coating filled with organophilic montmorillonite clay

Ceramic filled polymer coatings have been shown to increase the salt water corrosion protection and wear resistance of metallic substrates. With an increase in natural and anthropogenic CO2 use as an enhanced oil recovery method paired to conventional brine-based recovery, termed ‘water after gas’ the impact of corrosion remains unknown. In this paper, we investigate the effect of salt water corrosion in a filled and unfilled coating before and after supercritical CO2 exposure. Corrosion performance is evaluated using electrochemical Tafel and impedance spectroscopy. Wear was measured using a pin on disk testing. After exposure to CO2, the corrosion performance of filled and unfilled systems were similar while the wear resistance of the filled coating was superior

Metal Matrix Composite Coatings of Cupronickel Embedded with Nanoplatelets for Improved Corrosion Resistant Properties

This article studies the effects of nanoplatelet reinforcement on the durability, corrosion resistance, and mechanical properties of copper-nickel coatings

Electrodeposition of 70-30 Cu-Ni nanocomposite coatings for enhanced mechanical and corrosion properties

A copper-nickel alloy (70:30 ratio) was electrochemically deposited and compared to a composite coating incorporating layered silicate platelets to obtain copper-nickel-montmorillonite (MMT). The composite coatings were electrochemically deposited from a citrate bath to investigate the effects of MMT on the corrosion and mechanical properties of the coatings. Incorporation of MMT into the Cu–Ni alloy films was not affected by the deposition parameters such as applied voltage and pH. Scanning electron microscopy and atomic absorption spectroscopy confirmed the successful incorporation of the MMT into the coatings. Longer term stability in the presence of corroding solutions was noted for the copper-nickel composite films. The Tafel calculations showed an increase in polarization resistance, Rp, from 190.7 kΩ·cm2 for pure Cu–Ni to 314.3 kΩ·cm2 for Cu–Ni-0.2% MMT after soaking the coatings in 3.5% NaCl at 25 °C for two weeks, which was consistent with the resistance increase measured by electrochemical impedance spectroscopy. Microhardness test results showed about a 25% increase in the hardness for the copper-nickel coatings incorporated with the layered silicate platelets versus the pure Cu–Ni coating.This work was made possible by NPRP Grant 4-306-2-111 from the Qatar National Research Fund (a Member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors. The authors acknowledge the Center for Advanced Research and Technology (CART) at the University of North Texas.Scopu