Effect of Gum Arabic Karroo as a water-reducing admixture in cement mortar

Mbugua, Rose; Salim, Ramadhan Wanjala; Ndambuki, Julius M.

doi:10.1016/j.cscm.2016.09.002

Cited by 19 publications

(19 citation statements)

References 13 publications

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“…A retention time of 1 hour 17 minutes was observed for the ideal mix at 0.8% addition of CS over the control, which gives an additional time for concrete to be worked without affecting its strength properties. 4. The compressive strength, split tensile strength, flexural strength and static modulus of elasticity increased with an increase of CS content.…”

Section: Resultsmentioning

confidence: 89%

“…Researchers have therefore turned attention to the use of naturally occurring admixtures which is available abundantly, cost-effective, environmentally friendly, and can be processed locally. A couple of local alternatives which have been investigated for this purpose include Gum Arabic karoo by [4,5], Black liquor by [6], welan and neem gum by [7], bamboo leaf ash by [8] and corn starch by [9]. The use of locally-sourced alternatives for use as admixtures in modifying the properties of concrete has become essential due to the need to reduce dependence on chemical admixtures.…”

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confidence: 99%

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Experimental Investigation of the Physical and Mechanical Properties of Cassava Starch Modified Concrete

Oni¹,

Mwero²,

Kabubo³

2019

TOBCTJ

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Background: Concrete is a widely used material in construction, which has given rise to innovations in terms of modifying some of its properties to meet desired requirements. The use of chemical admixtures is important in this regard, which has necessitated the search for new materials which can serve as a substitute. Objective: This research work investigates the use of Cassava Starch (CS) as an admixture for improving the physical and mechanical properties of concrete. Methodology: The physical and mechanical properties of concrete were studied by adding CS by weight of cement at 0.4, 0.8, 1.2, 1.6 and 2.0%, respectively. Concrete cubes and cylinders were cast and cured for a test period of 7, 14, 28, 56 and 90 days, respectively. Unreinforced beams of size 150 x 150 x 530 were cast and cured for 28 days. A total of 6 mix proportion was used, five out of which were used to examine the effect of CS on the properties of concrete. Results: The workability of concrete reduced as the percentage of CS increased due to its viscosity modifying properties. CS increased the initial and final setting time of concrete for every increase in percentage addition. An improvement in the compressive strength, split tensile strength, flexural strength and elastic modulus of concrete were noticed for cassava starch-modified concrete over the control for some of the mixes at all days of curing. The density of concrete was found to decrease at 1.6 and 2.0% addition of CS in concrete. Conclusion: From the results of this investigation, CS improved the compressive, split tensile, flexural and elastic modulus of concrete at an optimum of 0.8 percentage addition of CS. The setting time of concrete was also increased, which makes CS suitable to be used as a retarding admixture in hot weather concreting. Based on the findings of the work, CS can be considered as an admixture to be used as a substitute for retarders and viscosity modifying admixtures for improved concrete properties.

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Section: Resultsmentioning

confidence: 89%

mentioning

confidence: 99%

Experimental Investigation of the Physical and Mechanical Properties of Cassava Starch Modified Concrete

Oni¹,

Mwero²,

Kabubo³

2019

TOBCTJ

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“…In the modified mixture, the lowest amount of entrained air was for a Gum Acacia Karroo percentage between 0.7% and 0.8%. e compressive strength was increased when the water to cement ratio could be reduced from 0.5 to 0.4 owing to a dosage of Gum Acacia Karroo between 0.7% and 0.9% [11].…”

Section: Introductionmentioning

confidence: 99%

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Mohamed

Osman

Smaoui

et al. 2018

Advances in Civil Engineering

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Arabic gum biopolymer (AGB) has recently been demonstrated to improve mechanical and physical properties of fresh and hardened concrete which makes it a promising sustainable and environmentally friendly water-reducing admixture. The present work focuses on the effect of added AGB on the workability, setting time, and durability of concrete. Furthermore, a microstructure analysis is conducted to provide objective evidence and support for previous findings and hypothetic interpretations. Flow table experiments are conducted on Portland cement mortar mixed with different percentages of AGB to evaluate the workability. The initial setting time of cement paste is measured for different AGB contents. X-ray fluorescence tests are performed on cement-AGB mix powder to determine its chemical composition. Carbonation depth in AGB concrete samples is estimated to assess durability. AGB-added cement powder was subjected to X-ray diffraction and SEM tests to determine the rate of hydration and to expose the microstructure properties of AGB cement mix and help explain its macroscopic behavior, respectively.

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“…In electrochemical study was carried out in the presence and absence of inhibitor, the values were recorded and the percentage of inhibition efficiency was calculated 12 .…”

Section: Procedures and Calculationmentioning

confidence: 99%

Evaluation of Physical, Chemical Properties and Characterization Studies of Organic Inhibitor (Azadirachta Indica Gum) Using Concrete Corrosion

Annaamalai¹,

Maheswaran²,

Ramesh³

et al. 2017

Int. Res. J. Pharm.

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The present research work mainly focused on the influence of natural admixtures using concrete with enhanced properties and to prevent the corrosion using natural inhibitors. Corrosion of reinforcement is one of the drawbacks in reinforced concrete structure to overcome corrosion problem an attempt has been made in the present investigation by use of corrosion inhibitors. The organic inhibitors extracted by water from Azadirachta indica (Gum). In this study. the effect of Azadirachta indica gum as set retarding admixture in cement pastes. The various concentrations of 0.2 mg/L to 1.6 mg/ L of the weight of cement and w/c ratio of 0.50. In the physical properties study, the inhibition efficiency was increased with increase in the concentration of inhibitors for mild steel aqueous medium the maximum concentration (1.6 mg/L). The effect of aqueous extract of (Azadirachta Indica Gum) on the corrosion inhibition of mild steel in various concentrations of 0.2 mg/L to 1.6 mg / L) solution was investigated by electrochemical study and weight-loss experiments at temperatures ranging from 303 K. The percentage of inhibition increased with the increase of the concentration of the inhibitor. At a concentration of 1.6 mg/ L, the percentage inhibition reached about 85.24% at 303 K. The SEM analysis showed that inhibitors adsorbed on mild steel surface to protect mild steel from corrosion. The aqueous extract was found to be an excellent potential corrosion inhibitor because of the high content of alkaloids. The results of inhibitors showed the natural gum has better corrosion inhibition efficiency. It is also observed that the efficiency of inhibitors depends on the exposure environment.

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Effect of Gum Arabic Karroo as a water-reducing admixture in cement mortar

Cited by 19 publications

References 13 publications

Experimental Investigation of the Physical and Mechanical Properties of Cassava Starch Modified Concrete

Experimental Investigation of the Physical and Mechanical Properties of Cassava Starch Modified Concrete

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Evaluation of Physical, Chemical Properties and Characterization Studies of Organic Inhibitor (Azadirachta Indica Gum) Using Concrete Corrosion

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