Investigation of sulfuric acid attack upon cement mortars containing silicon carbide powder

Jeon, In Kyu; Qudoos, Abdul; Jakhrani, Sadam Hussain; Kim, Hong Gi; Ryou, Jae-Suk

doi:10.1016/j.powtec.2019.10.026

Cited by 49 publications

(25 citation statements)

References 34 publications

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“…This can be explained by the morphology of this alkali-activated mixture which possess high magnesium sulphate (MgSO 4 ) and silicon dioxide SiO 2 contents, providing resistance against sulphate attack. Previous literature indicated the relationship between CS and pulse velocity as a measure of material deterioration, internal cracking, and pre-existing defects in mortars before and after immersion in sulfuric acid and sulphate solutions using the following exponential function [ 43 , 44 , 45 ], where V is the UPV, and the coefficients A and B are empirical constants.

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Section: Resultsmentioning

confidence: 99%

Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts

et al. 2021

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Eco-friendly and sustainable materials that are cost-effective, while having a reduced carbon footprint and energy consumption, are in great demand by the construction industry worldwide. Accordingly, alkali-activated materials (AAM) composed primarily of industrial byproducts have emerged as more desirable alternatives to ordinary Portland cement (OPC)-based concrete. Hence, this study investigates the cradle-to-gate life-cycle assessment (LCA) of ternary blended alkali-activated mortars made with industrial byproducts. Moreover, the embodied energy (EE), which represents an important parameter in cradle-to-gate life-cycle analysis, was investigated for 42 AAM mixtures. The boundary of the cradle-to-gate system was extended to include the mechanical and durability properties of AAMs on the basis of performance criteria. Using the experimental test database thus developed, an optimized artificial neural network (ANN) combined with the cuckoo optimization algorithm (COA) was developed to estimate the CO2 emissions and EE of AAMs. Considering the lack of systematic research on the cradle-to-gate LCA of AAMs in the literature, the results of this research provide new insights into the assessment of the environmental impact of AAM made with industrial byproducts. The final weight and bias values of the AAN model can be used to design AAM mixtures with targeted mechanical properties and CO2 emission considering desired amounts of industrial byproduct utilization in the mixture.

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…”

Section: Resultsmentioning

confidence: 99%

Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts

et al. 2021

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“…Previous literature indicated that the relationship between CS and pulse velocity as a measure of material deterioration, internal cracks, and/or pre-existing defects in the concrete before and after immersion in sulfuric acid and sulphate solutions could be estimated using the following exponential function [ 43 , 44 , 45 ].

where V is the UPV, and the coefficients A and B are empirical constants.…”

Section: Resultsmentioning

confidence: 99%

Performance Evaluation of Modified Rubberized Concrete Exposed to Aggressive Environments

et al. 2021

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Recycling of the waste rubber tire crumbs (WRTCs) for the concretes production generated renewed interest worldwide. The insertion of such waste as a substitute for the natural aggregates in the concretes is an emergent trend for sustainable development towards building materials. Meanwhile, the enhanced resistance of the concrete structures against aggressive environments is important for durability, cost-saving, and sustainability. In this view, this research evaluated the performance of several modified rubberized concretes by exposing them to aggressive environments i.e., acid, and sulphate attacks, elevated temperatures. These concrete (12 batches) were made by replacing the cement and natural aggregate with an appropriate amount of the granulated blast furnace slag (GBFS) and WRTCs, respectively. The proposed mix designs’ performance was evaluated by several measures, including the residual compressive strength (CS), weight loss, ultrasonic pulse velocity (UPV), microstructures, etc. Besides, by using the available experimental test database, an optimized artificial neural network (ANN) combined with the particle swarm optimization (PSO) was developed to estimate the residual CS of modified rubberized concrete after immersion one year in MgSO4 and H2SO4 solutions. The results indicated that modified rubberized concrete prepared by 5 to 20% WRTCs as a substitute to natural aggregate, provided lower CS and weight lose expose to sulphate and acid attacks compared to control specimen prepared by ordinary Portland cement (OPC). Although the CS were slightly declined at the elevated temperature, these proposed mix designs have a high potential for a wide variety of concrete industrial applications, especially in acid and sulphate risk.

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“…In addition, the C–H groups at around 420 °C and between 660 and 700 °C were associated with the decarbonation of CaCO 3 . However, this carbonate region can be generated through powder manufacturing [ 71 ]. The results showed that increasing the NS content increased the mass loss when below 200 °C, as seen on the DTG curve of the UWC mixes.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

et al. 2021

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In this paper, the effect of nano-SiO2 (NS) and MgO on the hydration characteristics and anti-washout resistance of non-dispersible underwater concrete (UWC) was evaluated. A slump flow test, a viscosity test, and setting time measurement were conducted to identify the impacts of NS and MgO on the rheological properties of UWC. The pH and turbidity were measured to investigate the anti-washout performance of UWC mixes. To analyze the hydration characteristics and mechanical properties, hydration heat analysis, a compressive strength test, and thermogravimetric analyses were conducted. The experimental results showed that the fine particles of NS and MgO reduced slump flow, increased viscosity, and enhanced the anti-washout resistance of UWC. In addition, both NS and MgO shortened the initial and final setting times, and the replacement of MgO specimens slightly prolonged the setting time. NS accelerated the peak time and increased the peak temperature, and MgO delayed the hydration process and reduced the temperature due to the formation of brucite. The compressive results showed that NS improved the compressive strength of the UWC, and MgO slightly decreased the strength. The addition of NS also resulted in the formation of extra C–S–H, and the replacement of MgO caused the generation of a hydrotalcite phase.

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Investigation of sulfuric acid attack upon cement mortars containing silicon carbide powder

Cited by 49 publications

References 34 publications

Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts

Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts

Performance Evaluation of Modified Rubberized Concrete Exposed to Aggressive Environments

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

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