Experimental investigation of pozzolanic concrete containing wheat straw ash
TL;DR: In this paper, the detailed optimization of wheat straw ash (WSA) as a pozzolanic material was investigated, which was carried out according to ASTM C618 and resul...
Abstract: This study investigated the detailed optimization of wheat straw ash (WSA) as a pozzolanic material. Characterization of WSA as pozzolanic materials was carried out according to ASTM C618 and resul...
Citations
More filters
09 Sep 2009
TL;DR: In this paper, compressive strength tests were carried out on six mortar cubes with cement replaced by rice husk ash (RHA) at five levels (0, 10, 20, 30, 40 and 50%).
Abstract: Compressive strength tests were carried out on six mortar cubes with cement replaced by rice husk ash (RHA) at five levels (0, 10, 20, 30, 40 and 50%). After the curing age of 3, 7, 14 and 28 days. The compressive strengths of the cubes at 10% replacement were 12.60, 14.20, 22.10, 28.50 and 36.30 N/mm2 respectively and increased with age of curing but decreased with increase in RHA content for all mixes. The chemical analysis of the rice husk ash revealed high amount of silica (68.12%), alumina (1.01%) and oxides such as calcium oxide (1.01%) and iron oxide (0.78%) responsible for strength, soundness and setting of the concrete. It also contained high amount of magnesia (1.31%) which is responsible for the unsoundness. This result, therefore, indicated that RHA can be used as cement substitute at 10% and 20% replacement and 14 and 28 day curing age.
29 citations
TL;DR: In this paper , the authors present a complete review of various husk and straw ashes and their impacts on the fresh and hardened properties of concrete including its preparation, microstructure, workability, compressive strength, splitting tensile strength and flexural strength.
15 citations
TL;DR: In this article, the reaction conditions of the sunflower oil methanolysis over wheat straw ash (WSA) were optimized by using the response surface methodology in combination with the historical experimental design.
Abstract: Wheat straw ash (WSA) was investigated as a new catalyst in biodiesel production from sunflower oil. The catalyst was characterized by temperature-programmed decomposition, X-ray powder diffraction, Hg porosimetry, N2 physisorption, and scanning electron microscopy - energy dispersive X-ray spectroscopy methods. The methanolysis reaction was tested in the temperature range of 55–65 oC, the catalyst loading range 10–20 % of the oil weight, and the methanol-to-oil molar ratio range 18 : 1–24 : 1. The reaction conditions of the sunflower oil methanolysis over WSA were optimized by using the response surface methodology in combination with the historical experimental design. The optimum process conditions ensuring the highest fatty acid methyl esters (FAME) content of 98.6 % were the reaction temperature of 60.3 oC, the catalyst loading of 11.6 % (based on the oil weight), the methanol-to-oil molar ratio of 18.3 :1, and the reaction time of 124 min. The values of the statistical criteria, such as coefficients of determination (R2 = 0.811, R2pred = 0.789, R2adj = 0.761) and the mean relative percent deviation (MRPD) value of 10.6 % (66 data) implied the acceptability and precision of the developed model. The FAME content after 4 h of reaction under the optimal conditions decreased to 37, 12, and 3 %, after the first, second, and third reuse, respectively.
4 citations
TL;DR: In this article, the porosity and void ratio determination (PVRD) method was used to determine the void structures of lightweight concrete specimens containing waste undersize pumice additive.
Abstract: Aggregate type and grain size are crucial factors that present significant characteristics on the strength. Within this context, the determination of the void ratio has an important place. This study aimed to examine the void structures of lightweight concrete specimens containing waste undersize pumice additive. The void ratio of the specimens was calculated by the porosity and void ratio determination (PVRD). The nondestructive ultrasonic pulse velocity test (NUPVT) was performed on the specimens, and the wave transmission characteristics were investigated. The void characteristics of the pores in the specimens were analyzed by digital image processing (DIP). After the identification of the texture, the void ratios were determined by the DIP with an accuracy of 93 to 97%. After the nondestructive and experimental studies, the compressive strength values of the specimens were determined by the uniaxial pressure tests and the void ratio-strength correlations were evaluated. As a result, it was determined that nondestructive methods yield similar results with PVRD to determine the void characteristics of specimens containing waste undersize pumice. In the study, the effects of wave characteristics passing through the specimen on the void structure and strength were revealed.
1 citations
01 Jan 2021
TL;DR: In this paper, low-cost hybrid aluminium metal matrix composites were developed using wheat husk ash and red mud as reinforcement, and their mechanical characterizations (such as density, yield strength, ultimate tensile strength and Rockwell hardness) were calculated by ANOVA and regression analysis.
Abstract: In this work, low-cost hybrid aluminium metal matrix composites were developed using wheat husk ash and red mud as reinforcement. Compositions varies from 5 to 15 wt%, through the stir casting process, and its mechanical characterizations (such as density, yield strength, ultimate tensile strength and Rockwell hardness) were calculated, and these results were optimized by ANOVA and regression analysis. It is evaluated that the density of composite material varies from 2.6 to 2.8 kg/m3, and yield strength and the ultimate tensile strength values improve with the amount of red mud. The hardness value ranges from 55 to 74 HRB. By ANOVA analysis, it is concluded that red mud and wheat husk ash reinforcement and their combination fall within the 90% probability level (p-value below 0.10). Here, red mud contribution is maximum than wheat husk ash and the combination of red mud with wheat husk ash.
References
More filters
Book•
26 Sep 2005
TL;DR: Concrete: Microstructure, Properties, and Materials as mentioned in this paper provides complete details on the microstructure-property relationship approach to provide scientific explanation for the strength and durability of concrete.
Abstract: Comprehensive, up-to-date coverage of the properties, behavior, and technology of concrete Fully revised to include the latest advances in concrete technology, Concrete: Microstructure, Properties, and Materials provides complete details on the microstructure-property relationship approach to provide scientific explanation for the strength and durability of concrete. This in-depth resource discusses the microstructure and properties of hardened concrete; concrete-making materials and concrete processing; and current developments in concrete technology, mechanics, and nondestructive testing methods. New to this Edition Inclusion of recently built/ongoing construction projects worldwide Information on shrinkage-reducing admixtures Coverage of the latest advances in concrete technology-self-consolidating concrete; nanotechnology of concrete; shotcrete; expansive cement; and concrete for nuclear radiation Details on modeling of ice formation and alkali-aggregate reaction in concrete 1,000 PowerPoint slides and videos that illustrate topics presented in the book
3,730 citations
TL;DR: In this paper, the growth of C-S-H is the principal factor controlling the main heat evolution peak and after several days space becomes the major factor controlling hydration, but deceleration cannot be attributed to diffusion control.
705 citations
TL;DR: In this article, the degree of hydration of the cement in Portland cement (PC) paste was obtained by determining the non-evaporable water (Wn) content of the fly ash.
540 citations
TL;DR: In this article, the effect of supplementary cementing materials (SCM) on alkali-silica reaction (ASR) was studied and it was shown that the efficacy of SCM is dependent on the composition of the SCM.
351 citations
TL;DR: In this article, an experimental study on the effects of the incorporation of rice-husk ash (RHA) in cement paste and concrete on the hydration and the microstructure of the interfacial zone between the aggregate and paste.
286 citations