Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim, Gwangmok; Jang, Jeong Gook; Naeem, Faizan; Lee, Haeng‐Ki

doi:10.1007/s40069-015-0111-x

Cited by 45 publications

(14 citation statements)

References 40 publications

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“…The log differential curve of the mixture of slag and CCR showed a significant development of pores that have diameters below 80 nm. The C10 sample showed a noticeable amount of pores with dimeters ranging from 10 to 100 nm, which is mainly attributed to the presence of C-A-S-H [33]. This observation is in fair agreement with the thermodynamic calculation, which predicted the amount of C-A-S-H to decrease with an increase of the CCR input.…”

Section: Resultssupporting

confidence: 75%

Utilization of Calcium Carbide Residue Using Granulated Blast Furnace Slag

et al. 2019

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The solidification and stabilization of calcium carbide residue (CCR) using granulated blast furnace slag was investigated in this study. CCR binding in hydrated slag was explored by X-ray diffraction, 29Si and 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and thermodynamic calculations. Mercury intrusion porosimetry and and compressive strength tests assessed the microstructure and mechanical properties of the mixtures of slag and CCR. C-A-S-H gel, ettringite, hemicarbonate, and hydrotalcite were identified as the main phases in the mixture of slag and CCR. The maximum CCR uptake by slag and the highest volume of precipitated solid phases were reached when CCR loading in slag is 7.5% by mass of slag, according to the thermodynamic prediction. This feature is also experimentally observed in the microstructure, which showed an increase in the pore volume at higher CCR loading.

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Section: Resultssupporting

confidence: 75%

Utilization of Calcium Carbide Residue Using Granulated Blast Furnace Slag

et al. 2019

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“…Observing the similarity of the results to the previous studies, the endothermic peaks of the samples located at 723–728 °C were caused by the formation of carbonates and sodium carbonates. Silicon and aluminum phases occurred between 600 and 800 °C [ 67 ]. Thus, the high heating process for secondary silicate phases may be occurred due to the endothermic peak at around 700 °C, resulting in the intensification of the geopolymer paste, which was considered the cause of the strength gain of the geopolymer mortar at elevated temperature [ 68 ].…”

Section: Test Results and Discussionmentioning

confidence: 99%

Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics

et al. 2021

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This study aimed to determine the effects of design parameters, including the liquid/solid ratio (L/S), Na2SiO3/NaOH weight ratio, and curing temperature, on class F fly ash-based geopolymer composites. For this purpose, two disparate sources of fly ash were supplied from Çatalağzı (FA) and İsken Sugözü (FB) Thermal Power Plants in Turkey. Two different L/S ratios of 0.2 and 0.4 were used. The Na2SiO3/NaOH ratios in the alkaline solutions were 1, 1.5, 2, 2.5, and 3 by weight for each type of geopolymer mixture. Then, 40 different mixes were cured at two specific temperatures (70 °C and 100 °C) for 24 h and then preserved at room temperature until testing. Thereafter, the physical water absorption properties, apparent porosity, and bulk density were examined at 28 days on the hardened mortars. Additionally, compressive and flexural tests were applied to the geopolymers at 7, 28, and 90 days. It was found that the highest compressive strength was 60.1 MPa for the geopolymer manufactured with an L/S of 0.2 and Na2SiO3/NaOH ratio of 2. Moreover, the best thermal curing temperature for obtaining optimal strength characteristics was 100 °C for the FB.

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“…Its characteristics make it as good sound-absorbing and heat-insulating material, a bed material for vegetation and sewage purification. Of course, the most widely and longest-lasting material applied as permeable pavement [2][3][4][5][6][7][8][9][10]. It is preferred by engineers to use it in road engineering with the following benefits: precipitation enters the soil through multi-porous while filtering for contaminants in water [11], allow more water to evaporate from the soil and natural recharge of groundwater [12,13], effectively effectively suppress the loss of surface water [14], reduce the urban heat island effect [15], limit the budget cost of building road drainage systems [12], and at the same time, porous materials can effectively absorb noise [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Influence of Molding Methods on Properties of Pervious Concrete

Zheng

Ming-fu

2022

J. Phys.: Conf. Ser.

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Despite the common use of pervious concrete (PC), there is no standard way of producing the test specimens, which undergo testing to infer the behaviour of PC in the field. Vibrating table is the most common method but greatly reduced in vibration time compare with normal concrete in the laboratory. Marshall compaction and superpave gyratory compactor (SGC) are recommended standard molding methods for porous asphalt mixtures manufactured in the laboratory environment. Three kinds of pervious concrete samples with three target porosities were prepared by the above three methods, and the effects of the molding method on the physical properties, mechanical properties and durability of the samples were investigated in the study. Experimental results showed, with different molding methods adopting, pervious concrete with the same mixture design exhibits slightly different physical and mechanical properties. After analysis and comparison, SGC is the best choice to obtain concrete with high permeability, good freeze-thaw resistance and high strength, followed by Marshall compaction molding, and vibration molding is the last one. As a result, a win-win situation of the hydraulic characteristics and mechanical properties of pervious concrete can be achieved due to both optimized mix-design and appropriate molding method.

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Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Cited by 45 publications

References 40 publications

Utilization of Calcium Carbide Residue Using Granulated Blast Furnace Slag

Utilization of Calcium Carbide Residue Using Granulated Blast Furnace Slag

Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics

Experimental Investigation on Influence of Molding Methods on Properties of Pervious Concrete

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