In this world of rapid urbanization the demand for natural construction materials is increasing day by day which has created a necessity for alternative construction materials. Recycling of materials is a possible way of eradicating the acute shortage of materials. Considerable work has been done in the area of self-compacting concrete by partial replacement of coarse aggregates (CA) with recycled coarse aggregates (RCA) obtained from construction and demolition debris. The present study has been done by adding steel fibers to concrete in a view of improving the mechanical properties of SCC so that it can be applied in beam column joints. An ideal mix proportion was arrived at, as a result of repeated trials and specimens that were cast and cured. The compression, tensile, and flexural strength parameters were determined and the result has been presented. The results obtained reveal that brick bats in combination with steel fibres may be used extensively in SCC.
As concrete being widely used in the field of construction, the demand for the materials used is increased rapidly. To meet the growing demand it is necessary to use alternative materials to meet the requirements. The Pineapple leaf fibre (PALF) is a highly available material in larger quantity with lesser water content and higher fiber content which makes it as a desirable material as natural fibre. The workability characteristics of Self compaction Concrete (SCC) like flowability, filling ability, passing ability, resistance to segregation and bleeding of concrete were out by using slump cone, U-box, L-box, V-Funnel and J-ring test. The test result shows satisfactory results on the workability of SCC. The fresh and hardened properties of concrete were found at the ages 7 days, 14 days and 28 days for various addition of PALF and various replacements of granite powder with the fine aggregate. The addition of PALF has achieved maximum compressive strength and split tensile strength in all ages of concrete at PALF0.2. The replacement of granite powder with fine aggregate seems to be promising in achieving the maximum compressive strength and split tensile strength at the 10% of replacement.
In the field of construction hollow sections have found wide application due to its advantageous properties. Many research works have been conducted to study the flexural and tensional behaviour of hollow reinforced concrete beams. But its behaviour using High-Performance Concrete (HPC) has been poorly noticed. In this study an attempt made to evaluate Hollow reinforced beams made with HPC and reinforced with hybrid steel fibres. The flexural behaviour of hollow beams based on the effect of Carbon fibre reinforced polymer (CFRP) has also been explored. A comparison is made between the results obtained from analysis using ANSYS software with the experimental test result. It is noticeable that the flexural strength, its ductility, and stiffness is not affected but the self-weight of the structure is reduced due to hollow beams.
This study presents an investigation on the flexural behaviour of normally vibrated concrete and self-compacting concrete beams subjected to loading tests. Seven specimens were cast to investigate the flexural behaviour. This experimental analysis mainly varied the parameters such as (1) Percentage of coarse aggregate replacement (RCWA), and (2) percentage of Steel fibres. Results are exhibited in terms of flexural strength, stiffness, failure modes, and deflection curves. The test results revealed that RCWA could be successfully used in SCC. The flexural behaviour of beam decreased with the addition of RCWA. However, the addition of RCWA in combination with SF in SCC significantly improved the overall flexural behaviour.Finite element model also developed to study the behaviour of beams produced by SCC with RCWA content.
In the olden days, some eco-friendly and easily accessible materials such as mud, lime, and egg mixer were used in the building constructions. However, these materials are not sufficient to construct huge and more buildings. For this, the researchers preferred the cement as the main binding material used in the concrete mixture. The cement manufacturing companies are releasing more CO 2 during cement production, which leads to the environmental pollution in the earth. To overcome the problem of the ecological system, this work proposed the Self Compacting Geo-Polymer Concrete -SCGPC, which is not a normal cement concrete. The SCGPC is used to fill cavities easily and rapidly without any compaction. The industrial wastes like fly ash, GGBS -Ground Granulated Blast -furnace Slag, metakaolin kaolinite, clay, iron ore, silica fume and limestone can be used as the substitute materials for cement. This work mainly concentrates on the effects of two specific mechanical properties such as split tensile and compressive strength of SCGPC by adding fly ash and GGBS. These factors were evaluated with the Alkaline Activator Solution (AAS) to fly ash and GGBS ratio, the ratio of Na 2 SiO 3 solution to the NaOH solution, the dosage of superplasticizer, rest period and temperature degree. The proposed SCGPC (8M, 10M and 12M) has analyzed both split tensile and compressive strength in three sets (7, 28 and 56 days). At last, the analyzed results were compared with conventional concrete. Based on the comparison, while the increase of curing temperature, both mechanical properties of SCGPC have reduced.
In recent years, the structural applications of hollow core beams became widespread because of its advantages such as high strength, large energy absorption capacity, light weight, adequate ductility and concrete saving. The main objective of this study is to analyse the performance of reinforced hollow core beams strengthened with CFRP (Carbon Fibre Reinforced Polymer) wrapping. Experimental results revealed that the confinement of CFRP wrapping significantly enhanced the load carrying capacity, stiffness of hollow core beams. Numerical models were developed with the help of ANSYS software to validate the behaviour of hollow beams with CFRP wrapping.
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