Optimization of Calcined Bentonite Caly Utilization in Cement Mortar using Response Surface Methodology

Reddy, S. Sahith; Reddy, M. Achyutha Kumar

doi:10.5829/ije.2021.34.07a.07

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…Besides these, Valipour et al [124] and Walker and Pavía [22] reported that the compressive strength of concrete with NP increases with decreasing NP particle size. Also, Homayoonmehr et al [151] and Reddy and Reddy [114] 4…”

Section: Effects On Mechanical Propertiesmentioning

confidence: 97%

“…Initial and final setting time is used to know the rate of concrete hydration which is crucial in concrete strength development [107]. The employment of NP in concrete increases initial and final setting time with increasing the percentage content of pozzolana [99,[113][114][115]. That is due to prolonging the hydration process that can cause slow stiffening of the concrete mixture [95,116].…”

Section: Effects Of Natural Pozzolana In Concretementioning

confidence: 99%

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Effect of Natural Pozzolana on Physical and Mechanical Properties of Concrete

Fode,

Jande,

Kivevele

2024

Advances in Civil Engineering

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Construction industries are rapidly growing, sacking high amounts of concrete which has a highly dense microstructure with excellent mechanical properties, more durable, and highly eco-friendly materials. Hence, many of the researchers are interested in solving this problem with replacing concrete by natural pozzolana (NP) which is a supplementary cementitious material mostly from volcanic sources having much active silica content that can improve the durability and mechanical properties of concrete. However, it is not well-known which common optimum replacement range can give the most desirable concrete properties. So, the present study sought to review the effects of replacing NP from volcanic sources on the durability, physical, mechanical, and microstructural properties of concrete, also, to identify the most common dose of a positive effect as a replacement in concrete. The review shows that many of NP used by different literature from different places satisfy ASTM replacement standard in concrete, especially, based on its chemical compositions. Also, the review observed that employing NP in concrete significantly improves concrete workability, lengthens setting time, and reduces bulk density, porosity, water absorption, and chloride ion migration by making denser concrete microstructure. In general, adding 5%–20% of NP in concrete significantly improves compressive strength, split tensile strength, and flexural strength. Specifically, most of the studies found 15% replacement of NP having volcanic sources can give optimum strength. Besides these, most of the studies indicated that the improvement of the strength was more visible at the concrete age of 7–28 days.

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Section: Effects On Mechanical Propertiesmentioning

confidence: 97%

Section: Effects Of Natural Pozzolana In Concretementioning

confidence: 99%

Effect of Natural Pozzolana on Physical and Mechanical Properties of Concrete

Fode,

Jande,

Kivevele

2024

Advances in Civil Engineering

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“…A functional series of advantageous statistical and mathematical methods that are successfully employed to model and optimize the issues and problem related to the engineering field is called RSM. RSM is a technique whose major aim is to enhance and optimize the obtained responses which were affected by different factors related to the input process [19]. Besides, the connections between received responses and the factors related to manageable input are quantified by RSM.…”

Section: *Correspondingmentioning

confidence: 99%

Optimal Selection of Cutting Parameters for Surface Roughness in Milling Machining of AA6061-T6

2022

IJE

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Due to its ability to remove material quickly while maintaining optimum surface quality, end milling is considered one of the most frequent metal cutting procedures in industry. The present study aimed to investigate the impacts of cutting parameters and tool geometry on milling of Aluminum Alloy 6061-T6 to examine the impact surface roughness by utilizing response surface methodology (RSM). RSM was used to create a second-order mathematical model of surface roughness for this purpose. A multiple regression analysis used the analysis of variance to demonstrate the effect of machining settings on surface roughness and determine experiment performance. The trials for optimizing surface roughness were set up utilizing the central composite design (CCD) method and various cutting parameters such as spindle speed, feed rate and depth of cut. Also the parameters used in tool geometry are the radial rake angle (10, 13, 16, 19 and 22 degrees), and nose radius (0, 0.2, 0.4, 0.6 and 0.8 mm). The result shows that the nose radius has more significant effect on the surface roughness followed by the radial rake angle. Moreover, the effect of the depth of cut on surface roughness is more dominant than cutting speed. The optimum combinations of cutting and tool geometry parameters were cutting speed (60.53 m/min), feed rate (0.025 mm/tooth), depth of cut (0.84 mm), radial rake angle (12.72 degree) and nose radius (0.34 mm).

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“…In this method, the input variables with more F-value and less P-value (less 5% with 95% confidence level) have the most effect on the output variables. Therefore, they can be selected as the main variables with regard to their roles in the experimental data [2,18]. The ANOVA table for the input and output variable are shown in Table 4.…”

Section: Analysis Of Variance (Anova)mentioning

confidence: 99%