Evaluation of the Performance and Microstructure of Ecofriendly Construction Bricks Made with Fly Ash and Residual Rice Husk Ash

Hwang, Chao‐Lung; Huynh, Trong‐Phuoc

doi:10.1155/2015/891412

Cited by 31 publications

(17 citation statements)

References 33 publications

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“…Moreover, their use is growing at a faster rate for the development of sustainable cement-based materials [3,4]. Comprehensive analysis has been conducted on these ashes by a variety of investigators to assess their pozzolanic activity [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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In developing countries, one of the usual practices is the uncontrolled, open burning of corn stalk (CS) or its utilization as a fuel. It is known that the ash obtained under uncontrolled burning conditions constitutes blackish and unburnt carbon particles as well as whitish and grayish particles (representing crystallization of silica) due to over burning. However, controlling the burning process can improve the quality of ash produced to effectively use it in cement-based materials. Hence, this research was aimed at exploring the pozzolanic properties of corn stalk ash upon calcination and grinding, for it to be used in the manufacturing of sustainable cement-based materials. In order to obtain a suitable corn stalk ash (CSA), which can be used in cement/concrete, a research investigation consisted of two phases. In the first phase, calcination was carried out at 400°C, 500°C, 600°C, 700°C, and 800°C for 2 hours. The tests applied on the resulting ashes were weight loss, XRD, pozzolanic activity index (PAI), Chapelle, Fratini, and consistency. From XRD spectra, it was found that, at lower temperatures, silica remained amorphous, while it crystallized at higher temperature. Ash combusted at a temperature of 500°C possessed largest pozzolanic activity of 96.8%, had a Fratini CaO reduction of 93.2%, and Chapelle activity of 856.3 mg/g. Thus, 500°C was chosen as an optimum calcination temperature. In the second phase, the ash produced at 500°C was grinded for durations of 30, 60, 120, and 240 minutes to ascertain the optimum grinding times. Resulting ashes were examined for hydrometer analysis, Blaine fineness, Chapelle activity, and pozzolanic activity. Experiment outcomes revealed a direct relationship between values of Blaine fineness, surface area, Chapelle activity, PAI, and grinding duration. It was concluded that CSA can be used as a pozzolan, and thus, its utilization in cement/concrete would solve ash disposal problems and aid in production of eco-friendly cement/concrete.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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“…e reason for the improved strength may be that the addition of GGBS, with filling spaces between grains of sandy soil and contributing to a better material size distribution, results in lower porosity and thus better mechanical strength [16]. Besides, the siliceous and aluminous materials in GGBS can react with Ca(OH) 2 from cement hydration to produce C-S-H and C-A-S-H, which increase over time, occupying more void spaces inside the bricks and creating an increasingly dense structure [17][18][19].…”

Section: Microstructure Analysismentioning

confidence: 99%

Utilization of Sandy Soil as the Primary Raw Material in Production of Unfired Bricks

Tao

Pan

Qiao

et al. 2018

Advances in Materials Science and Engineering

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In this study, attempts were made to use sandy soil as the main raw material in making unfired bricks. e sprayed-cured brick specimens were tested for compressive and flexural strength, rate of water absorption, percentage of voids, bulk density, freezing/thawing, and water immersion resistance. In addition, the microstructures of the specimens were also studied using scanning electron microscope (SEM) and X-ray diffraction (XRD) technique. e test results show that unfired brick specimens with the addition of ground-granulated blast-furnace slag (GGBS) tend to achieve better mechanical properties when compared with the specimens that added cement alone, with GGBS correcting particle size distribution and contributing to the pozzolanic reactions and the pore-filling effects. e test specimens with the appropriate addition of cement, GGBS, quicklime, and gypsum are dense and show a low water absorption rate, a low percentage of voids, and an excellent freezing/thawing and water immersion resistance. e SEM observation and XRD analysis verify the formation of hydrate products C-S-H and ettringite, providing a better explanation of the mechanical and physical behavior and durability of the derived unfired bricks. e results obtained suggest that there is a technical approach for the high-efficient comprehensive utilization of sandy soil and provide increased economic and environmental benefits.

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“…Unfired building bricks were prepared in a steel mold, with dimensions of 220×105×65 mm, applying forming pressure of around 5 MPa that is much lower than the forming pressures used in most of the previous studies (10-35 MPa) [3][4][5][6][11][12][13][14][15][16]. The purpose of this study is to assess the use of low forming pressure and industrial and agricultural by-products for producing unfired building bricks.…”

Section: Samples Preparation and Test Programsmentioning

confidence: 99%

“…Recently, rice husk ash has been used for producing unfired building bricks [12][13][14][15][16]. Unfired building bricks were made from FA, rice husk ash, and sand using geopolymerization technology [12][13][14]. Other unfired building bricks were made from cement, FA, and rice husk ash based on the cementing reaction [15][16].…”

Section: Introductionmentioning

confidence: 99%

Engineering properties of unfired building bricks produced using URHA-FA cement blends

Ngo¹,

Huynh²

2018

VJSTE

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The production of cement and traditional fired clay bricks consumes intensive energy and inversely affects the environment. In addition, a huge quantity of solid waste materials such as rice husk ash and fly ash (FA) are generated from both industrial and agricultural activities. This study investigates the use of unground rice husk ash (URHA) and FA for manufacturing unfired building bricks. FA was used as a cement substitute (15%, 30%, and 50%), whereas URHA was used as a chippings replacement (5%, 10%, and 15%) in the brick mixtures. Test results indicate that all of the brick samples had consistent dimensions and were free of visible defects. Generally, increasing the URHA or FA replacement levels reduced the strength, bulk density, and material cost. However, it increased the water absorption capacity of the brick samples. Moreover, bricks with 10% URHA and 50% FA registered the lowest cost. Properties of all of the brick samples met the Grade M15 requirements of the TCVN 6477-2011 standard of high-quality unfired building bricks.

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Evaluation of the Performance and Microstructure of Ecofriendly Construction Bricks Made with Fly Ash and Residual Rice Husk Ash

Cited by 31 publications

References 33 publications

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Utilization of Sandy Soil as the Primary Raw Material in Production of Unfired Bricks

Engineering properties of unfired building bricks produced using URHA-FA cement blends

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