Compressive Strength Properties Of Concrete Research Articles

Enhancing Concrete Properties with Banana Stem Juice Additive: A Study on Workability and Compressive Strength

Additives are integral components of modern concrete mixing materials. This study aimed to evaluate the workability and compressive strength of concrete incorporating banana stem juice as a natural additive (BSJA). A laboratory experiment was conducted to assess the impact of BSJA on concrete properties. Concrete mixtures with a ratio of 1:2:4 were prepared both with and without BSJA. A total of 36 cube specimens were created with varying percentages of banana stem juice, and their compressive strengths were measured. The results indicated that the inclusion of banana stem juice affected the concrete properties. On the 21st day, the compressive strength of the concrete without BSJA was 27.67 N/mm², compared to 29.67 N/mm² for 5% BSJA, 16.33 N/mm² for 10% BSJA, and 8.00 N/mm² for 15% BSJA. The slump values recorded were 15 mm for 0% BSJA, 20 mm for 5% BSJA, 45 mm for 10% BSJA, and 65 mm for 15% BSJA. The average compressive strengths of concrete specimens with 5% BSJA at 14 days (23.3 N/mm²) and 21 days (29.2 N/mm²) were higher than those of specimens without BSJA. Over the 14 and 21-day periods, specimens with BSJA consistently showed higher compressive strengths compared to those without. These results suggest that 5% BSJA enhances the compressive strength properties of concrete.

Evaluation of the impact of chemical admixtures on the compressive strength properties of concrete

This study was carried out to evaluate the effect of chemical admixtures on the compressive strength of concretes. The concretes were produced with the concrete mix ratio of 1:2:4, while water to cement (w/c) ratios of 0.35, 0.4, 0.45, 0.5 and 0.55 were adopted. Different concrete mixtures were produced using two chemical admixtures (hydroxycarboxylic acid and MasterRheobuild 1100) applied at the rate of 1.3% (weight of the cement), during the production process. Laboratory results of the fine aggregate used for the concrete production showed that it was well graded met international standards. All the concretes were produced and tested in accordance to American Society for Testing and Materials (ASTM) standard procedures. Results indicated that the concrete produced with the chemical admixtures showed better concrete performances both in the fresh and hardened state. After 28 days of casting, concrete produced with MasterRheobuild 1100 admixture had the best compressive strength (32 MPa); compared with the compressive strength of the concrete produced with the hydroxycarboxylic acid admixture (28 MPa), and the control concrete samples that had compressive strength of 25 MPa. In addition, the fresh concrete produced with chemical admixtures gave a better slump than the fresh concrete produced without any chemical admixture. Likewise, hydroxycarboxylic acid admixture performs better among the two admixtures used, given a more linear relationship between the slump and water/cement ratio. These results showed the importance of chemical admixtures when higher compressive strength becomes a vital factor in structural constructions

Impacts of nonconventional construction materials on concrete strength development: case studies

Sustainable building technology is a new approach adopted in built environment, which is focused on significantly reducing impact of the construction industry on the environment. Moreover, the world is largely driving development of sustainable and smart products to mitigate global pollution issues. In this study, assessment of the impacts of using alternative constituents such as crumb rubber, coconut shell, recycled aggregate, GGBS, human hair, banana fiber, industrial sludge, saw dust, rice husk, wood waste, textile, copper slag, textile, glass powder, plastic etc., on concrete strength development using case studies has been performed. The paper explores the research work carried out towards sustainable approach in replacement of basic composition of concrete. It focuses on various waste materials used as a substitute options in concrete and characteristic strength development along with potential challenges. Leading researches relating to sustainable materials were also explored. The results show that the alternative aggregates, mostly with minimally usage of about 20% increased the compressive strength properties of concrete. Usage of fibres to about increased the flexural property of concrete and the replacement of waste sludge didn’t show appreciable increased of compressive strength.

Effect of Waste Foundry Sand, Waste Glass, and Glass Fiber on Mechanical Properties of Concrete

The proposed study present behaviour of concrete with inclusion of waste foundry sand (WFS), waste glass, and glass fiber in different concrete trial mixes. Waste foundry sand (WFS) is basically by-product formed from metal casting industries ferrous or non-ferrous, which due to rapid concrete construction in world used as an alternative of sand. Waste glass can be used in concrete in crushed form as a replacement of aggregate or in powdered form as a replacement of cement, the only problem with waste glass is it is prone to alkali-silica reaction due to different composition of different types of glasses. Glass fiber is added with waste glass and waste foundry sand (WFS) to increase strength. Normal concrete grade M25 (1:1:2) is used for this experimental purpose, different concrete trials were casted which consist of replacement of sand with waste foundry sand in different proportion (0%, 10%, 20%, and 30%). Next trial consists of optimum value of (WFS) with different proportion of waste glass (0%, 10%, and 20%, 30%) as a replacement of fine aggregate. Final trial consists of addition of glass fiber (0%, 0.25%, 0.50%, and 0.75%) in optimum value of second trial. Mechanical properties of concrete compressive strength, split-tensile strength, flexural strength was examined at 7, 14, 28, and 56 days curing period.

Influence of PET Waste on Mechanical Properties of Concrete

Recycling of plastic is one of the major issues in the today’s world .In this paper, study is carried on properties on concrete using poly ethylene terephthalate waste fibers (PET). PET fibers are replaced with fine aggregate by 10,15,20,25 and 30%. Concrete is tested for fresh and hardened properties. Slump test is conducted to find out the workability of concrete. To check the mechanical properties of concrete compressive strength, flexural strength tests are conducted on concrete specimens.

Investigating possibilities for using sea shell on compressive strength properties of concrete

The reason of this attempt was to demonstrate that seashells can be utilized as a partial replacement for fine aggregate in concrete for enhancing strength properties. Since seashells are widely available everywhere in coastal and seashore areas, and some of the concrete materials cannot be found easily everywhere. The strategies utilized as a part of this attempt was to replace burnt and crushed seashells with fine aggregate at 10%, 20% and 30% and compare it with each other and the traditional Ordinary Portland Cement concrete regarding mechanical properties following 7 and 28 days. In conclusion, despite the fact that seashells are generally accessible and can be effortlessly gathered from seashore and beach front regions, the process of burning and crushing requires a lot of energy and is tedious. In spite of the fact that the results demonstrated that utilizing 20% seashell to fine aggregate substitution has a somewhat higher in compressive and flexural properties than that of Ordinary Portland Cement concrete.

The influence of recycled concrete aggregate on the properties of concrete

Use of Recycled Coarse Aggregate (RCA) in concrete can be described in terms of environmental protection and economy. This paper deals with the mechanical properties of concrete compressive strength, splitting tensile strength, modulus of elasticity, and modulus of rupture. Three kinds of concrete mixtures were tested, concrete made with Natural Coarse Aggregate (NCA) as a control concrete and two types of concrete made with recycled coarse aggregate (50% and 100% replacement level of coarse recycled aggregate). These kinds of concrete were made with different targets of compressive strength of concrete f ’c (35MPa) and (70 MPa). Fifty specimens were tested of the fresh and hardened properties of concrete. The waste concrete from laboratory test cubes was crushed to produce the Recycled Coarse Aggregate used in recycled concrete. A comparative between the experimental results of the properties for fresh and hardened concrete is presented in the paper. Recycled aggregate concrete (RCA) had a satisfactory performance despite the replacement ratios. It was found using the size of Recycled Coarse Aggregate (RCA) of (5-14) mm has quite similar in performance with the same size of Natural Coarse Aggregate (NCA), it is necessary to use high quality of recycled concrete (with low levels of impurities). Recycled aggregate as an alternative to natural aggregates -seems quite successful.

Investigation of gamma radiation shielding and compressive strength properties of concrete containing scale and granulated lead-zinc slag wastes

This paper summarizes the results of investigations of hybrid concrete containing scale and granulated lead–zinc slag wastes as substitutes for sand. Specifically, scale and granulated lead–zinc slag wastes are completely substituted for natural sand in concrete. The aim of this study was to investigate the effects of these waste materials on gamma radiation shielding and on the compressive strength properties of concrete. The linear attenuation coefficient (μ, cm−1) and compressive strength of the samples were measured experimentally and calculated, and the experimental values were subsequently compared with those of conventional concrete. The results clearly showed that hybrid scale waste/granulated lead–zinc slag waste concrete (Sc/Glzs-C) has better radiation shielding and compressive strength properties than conventional concrete. An additional objective of this study was to calculate the thickness of the hybrid concrete shield to be used instead of conventional concrete. The results showed that the produced concrete demonstrates better radiation attenuation properties with thinner thickness compared to conventional concrete. As a result, the new concrete containing scale waste and granulated lead–zinc slag waste is suitable for gamma radiation attenuation.

Compressive Strength Properties of Concrete and Mortar Containing Waste Pottery Fine Powder

Compressive Strength Properties of Concrete and Mortar Containing Waste Pottery Fine Powder

Strength Characteristics of Groundnut Leaf/Stem Ash (GLSA) Concrete

Abstract The compressive strength properties of concrete are substantial factors in the design and construction of concrete structures. Compressive strength directly affects the degree to which the concrete can be able to carry a load over time. These changes are complemented by deflections, cracks etc., in the structural elements of concrete. This research investigated the effect of groundnut leaf/stem ash (GLSA) on the compressive strength of concrete at 0%, 5 %, 10 % and 15 % replacements of cement. The effect of the water-cement ratio on properties such as the compressive strength, slump, flow and workability properties of groundnut leaf/stem ash (GLSA) mixes with OPC were evaluated to determine whether they are acceptable for use in concrete structural elements. A normal concrete mix with cement at 100 % (i.e., GLSA at 0%) with concrete grade C25 that can attain an average strength of 25 N/mm2 at 28 days was used as a control at design water-cement ratios of 0.65 and grading of (0.5-32) mm from fine to coarse aggregates was tested for: (1) compressive strength, and the (2) slump and flow Test. The results and observations showed that the concrete mixes from GLSA at 5 – 15 % ratios exhibit: pozzolanic properties and GLSA could be used as a partial replacement for cement at these percentage mix ratios compared with the control concrete; an increase in the water-cement ratio showed a significant decrease in the compressive strength and an increase in workability. Therefore, it is important that all concrete mixes exude an acceptably designed water-cement ratio for compressive strength characteristics for use in structures, water-cement ratio is a significant factor.

Environmental Enhancement through Utilization of Silica Fume as a Partial Replacement of Fine Aggregate in Concrete

The proper disposal of silica fume, an industrial by product waste, is one of the major issues for environmentalists world wide since dumping of silica fume as a waste material may cause severe environmental problems and hazards. An experimental research program was carried out to study the utilization of silica fume in concrete instead of dumping it as a waste material. Fine aggregate was partially replaced with 5, 10, and 15% of silica fume by weight. Compressive strength of concrete specimens, at three water/cement ratios of 0.50, 0.55, and 0.60, were compared with concrete specimens, with no silica fume, at 7, 28, and 56 days age. Specimens were cast and tested in accordance to ASTM standards. Test results indicated improvement, of up to 21.6%, in the compressive strength properties of concrete by the inclusion of silica fume as a partial replacement of fine aggregate. Compressive strength of concrete containing 10 to 15% silica fume was acceptable for structural applications since the minimum compressive strength was more than 27 MPa at 28 days. Environmentally speaking, results suggest that silica fume, used as a partial replacement of fine aggregate, could be conveniently used in concrete industry as a means of waste product utilization and as a saving of fine aggregate resources. Keywords: Concrete, Silica fume, Compressive strength, Fine aggregate, environmental hazards, Waste utilization

Influence of elevated temperatures on physical and compressive strength properties of concrete containing palm oil fuel ash

The residual compressive strength of concrete containing palm oil fuel ash (POFA) after exposure to elevated temperatures and subsequent cooling was investigated. Specimens from ordinary Portland cement (OPC) and POFA concrete mixes were prepared and subjected to various temperature levels. The POFA concrete contains 20% partial replacement of cement by weight and the temperature levels are; 100, 300, 500 and 800 °C. Two cooling systems which include cooling at room temperature by the natural breeze and water-spray were involved. Compressive strength test was conducted on control specimens as well as concrete specimens revived through the two cooling systems. Physical properties accompanying thermal degradations were also assessed. Residual performance as a ratio of residual strength to original strength was evaluated. The residual performance was found to be higher in POFA concrete than in the normal concrete. In addition, water-cooling was realized to aggravate strength reduction in both normal and POFA concretes when compared with air-cooling. High temperature and cooling system were also found to have great influence on physical properties, such as; mass loss, discolouration and crack patterns.

Structural reliability of eccentrically-loaded sections in RC columns made of recycled aggregate concrete

The results of experimental and theoretical research on the structural use of concrete manufactured with recycled aggregates are reported. In particular the statistical properties of concrete compressive strength have been studied using a sizable number of samples made with different percentages of recycled aggregates. On the basis of these experimental results a theoretical investigation has been carried out to evaluate the influence of the quality and quantity of recycled aggregates on the structural reliability of RC elements. A methodology for the calibration of the partial safety coefficient to be used with these concretes has been applied, taking as reference the results of Level-2 reliability analysis. The results obtained by means of a parametric experiment allows us to underline that the use of recycled aggregates in structural concrete can be made–as a rule–even with the complete replacement of the natural coarse aggregates but requires more strict design procedures to ensure the same structural reliability as conventional concrete.

Technical Note: Filler and superplasticizer usage on high strength concrete

In this research, the effects of filler (rock-dust) usage on high strength concrete have been investigated through lab experiments and some results have been obtained. The experiments involved three series of concrete with different cement proportions of 375 kg/m 3 , 400 kg/m 3 , and 425 kg/m 3 . For each series of concrete, three different groups of samples have been prepared, the first one being the reference concrete which contained 0% chemical admixture and 0% filler, the second one contained 1.5% chemical admixture and 0% filler and finally the last group contained 1.5% chemical admixture and 5% filler to the weight of cement used. The chemical admixture used was a type of Super plasticizer with a brand name of “DARACEM 190”, and the cement used was Ordinary Portland Cement of target compressive strength 42.5 N/mm 2 , obtained from Nuh Cement Plant. For each batch, Slump Tests and Unit Weight Tests were performed. For each stage and group, two 15 cm cubic samples have been tested for Compressive Strength after being cured in water at 20 ± 2 °C for ages of 3 days, 7 days, 28 and 60 days. The total number of samples was 72. As a result, filler usage was found to reduce the porosity of Concrete, increase the Unit Weight of Concrete, increase the need for water and improve the Compressive Strength Properties of Concrete.