Influence of Fibers and Fly Ash on Mechanical Properties of Concrete

Akhtar, J. N.; Tauheed, A.; Akhtar, Mohammad Nadeem; Haider, Abbas

doi:10.12691/ajcea-2-2-2

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…Akhtar and Akhtar [15] carried out a study to investigate the effect of adding fibers and Class 'C' fly ash on the mechanical properties of concrete. Akhtar et al [16] showed that behavior of recycled demolished concrete with partial replacement of cement by recycled remains is almost similar to that of conventional concrete. Recycling will not only preserve the natural resources, but will also obtain more economic use of such concrete, which is a good step toward sustainability around the world.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Demolished Waste as Coarse Aggregate in Concrete

2019

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Demolishing concrete building usually produces huge amounts of remains and wastes worldwide that have promising possibilities to be utilized as coarse aggregate for new mixes of concrete. High numbers of structures around the world currently need to be removed for several reasons, such as reaching the end of the expected life, to be replaced by new investments, or were not built by the local and international standards. Maintaining or removal of such structures leads to large quantities of concrete ruins. Reusing these concrete wastes will help in saving landfill spaces in addition to more sustainability in natural resources. The objective of this study is to investigate the possibility of using old recycled concrete as coarse aggregate to make new concrete mixes, and its effect on the evolution of the compressive strength of the new concrete mixes. Core samples for demolished concrete were tested to determine its compressive strength. The core test results can be thought of as aggregate properties for the new concrete. Then, the compressive strength and splitting tensile strength of the new recycled aggregate concrete (RAC) were determined experimentally by casting a cubes and cylinders, respectively. It was found that the evolution of compressive strength of recycled aggregate concrete is similar in behavior to the concrete with natural aggregate, except that it is about 10% lower in values. It was also seen that water absorption for recycled aggregate is noticeably higher than that for natural aggregate, and should be substituted for in the mix design.

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Section: Introductionmentioning

confidence: 99%

Utilization of Demolished Waste as Coarse Aggregate in Concrete

2019

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“…Natural human hair fibers is another additive that investigated by some other researchers to study the effects on mechanical soil properties. Human hair fibers have a good tensile strength which is same as that of strength of copper wire of same diameter [8]. Reference [9] have studied on present's characterization of human hair fiber-reinforced sand using direct shear tests under dry and saturated conditions.…”

Section: Introductionmentioning

confidence: 98%

Evaluating the performance of human hair impregnated with cement slurry in remediation of the Caspian coastal silty sand

2020

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Construction of various civil structures on problematic soils with weak or soft density is associated with many hazards. Such soils are prone to asymmetric subsidence caused by poor shear strength and high compressibility. Silica sand in the Caspian coast are mainly exposed to river sediments or absorbent sewage leachate of the urban and residential areas, and the presence of these materials in the soil environment weakens their strength parameters. Generally in the remediation of problematic soils, a variety of methods have been developed, including the use of bearing elements or remediation and modification of soil physical characteristics. In this study, for remediation of this type of sandy soils, the Human Hair Fibers (HHF) are used, which have considerable advantages in terms of tensile strength and compatibility with environmental conditions compared to other natural and synthetic fibers. The effect of adding different contents of natural human hair fibers as impregnated and nonimpregnated fibers to cement slurry at different soil relative densities shows that the addition of this type of natural fibers in both cases has improved the soil undrain compressive strength, increased the failure strain and initial Young's modulus, and also reduced the post-failure strength loss and increased the residual soil strength.

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“…Human hair fibres have a good elongation strength which is same as that of strength of copper wire of same diameter (Akhtar, Ahmad 2009). Hair is a non-biodegradable solid waste material which generate an environmental problem in disposal.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of soil reinforced with human hair fibre and chloride compounds

2019

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Many researches and advancements were carried to increase the strength of soil. Expansive soil contains montmorillonite clay mineral which is high swelling in nature. It is highly sensitive to moisture variation and it leads to encounter many engineering problems like low bearing capacity and settlement. Fibre reinforced soil is one among those advancements which offers a convenient, practical and economical method for overcoming sudden settlement and low bearing capacity. The soil can be reinforced with human hair because of its tensile property. Human Hair Fibre (HHF) is a waste material available at low cost and is not degradable in nature. Present study focuses on determining the strength characteristic of soil sample treated with human hair fibre and chloride compounds in different curing periods. Chemicals were added to the sample in varying percentage related to dry weight of the soil sample. Addition of human hair fibre and chloride compounds enhances the engineering properties of clayey soil. Chloride compounds were added at different percentages (2%, 4%, 6%, 8%, and 10%) to the soil and changes in the engineering property of soil such as penetration resistance, compaction characteristics and unconfined compressive strength of the soil were investigated. Based on present experimental study, the increase in the percentage of chloride compounds increases the dry density of the soil up to an optimum value then it decreases. The results showed that addition of HHF and chloride compounds stabilize the clayey soil to a particular extent.

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Influence of Fibers and Fly Ash on Mechanical Properties of Concrete

Cited by 9 publications

References 12 publications

Utilization of Demolished Waste as Coarse Aggregate in Concrete

Utilization of Demolished Waste as Coarse Aggregate in Concrete

Evaluating the performance of human hair impregnated with cement slurry in remediation of the Caspian coastal silty sand

Experimental investigation of soil reinforced with human hair fibre and chloride compounds

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