Studies on Influence of Admixtures and Aggregate Curing Conditions on the Strength of Lightweight Expanded Clay Aggregate Concrete (original) (raw)
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Development of Innovative Structural Light Weight Concrete by using Expanded Clay Aggregates
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International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
This research investigates the impact of partially substituting coarse aggregate with light weight coarse material (LECA). In numerous aspects, LECA mirrors the properties of coarse aggregate. Because self-weight accounts for a major amount of the total load applied to the structure, LECA is utilized in concrete to lower the need for coarse aggregate and in the design of concrete buildings. This is crucial in circumstances like poor soils and tall constructions. It also offers significant advantages in terms of lowering concrete density, which improves labour efficiency. Lightweight concrete has a lower density than standard concrete and provides better thermal insulation. The main purpose of this study is to examine the weight and strength characteristics of concrete, such as cube compressive strength, split tensile strength cylinders, and flexural strength of light weight concrete versus conventional concrete by substituting LECA for natural aggregates by 25%, 50%, 75%, and 100%, respectively. For far over two millennia, lightweight aggregate has been used successfully.
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International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
This study examined the structural behavior of Lightweight concrete (LWAC) using lightweight aggregates (Light expanded clay aggregates LECA) and normal weight aggregates, aims to investigate on concrete mix M25 by the effect of partially and fully replacement of the coarse aggregate by LECA with various percentage such as 20%, 40%, 60%, 80% and 100%. Analysis of this concrete was done in fresh state as well in hardened state to evaluate mechanical properties of concrete. This paper concentrated on performance parameters such as compressive strength, splitting tensile strength of the light weight concrete using LECA. The Lightweight concrete density varies from 40%-100% replacement of LECA such as 1996kg/m3-1597kg/m3. It reduces the weight of concrete and cost of concrete by reducing the aggregate cost and produces economical system.
Effects of Recycled Crushed Light Expanded Clay Aggregate on High Strength Lightweight Concrete
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Many researchers are carrying out environmentally-friendly action in the construction field, such as using recycled aggregate for sustainable development. Disposal of light expanded clay aggregate (LECA) waste into the land causes a severe impact on the environment. LECA is one of the construction materials that are broadly used for various applications. LECA has some excellent properties in its due to technical features, eco-friendly and entirely natural product with a low cost, lightweight, hardness and highly resistant to biological, chemical, and physical degradation forces. Recently, lightweight structural concrete by incorporating lightweight aggregate (LWA) is used to compensate heavy loads by reducing the overall self-weight of structure and minimize the size of the foundation simultaneously. In this study, partially replacement of high content light expanded clay aggregate (LECA) (50, 60, 70, 80, and 90%) have been used to achieve the mechanical properties of high strength ...
Journal of Thermal Analysis and Calorimetry, 2021
The residual compressive strength of eight lightweight concrete mixtures containing three commercial grading (Liapor HD 5 N, Liapor HD 7 N, and Liapor 8F) of coarse lightweight aggregate (LWA) were determined after to expose at high temperatures. Eight mixes were produced, two by normal weight aggregate and the rest by different types of LWA. The produced concrete was analyzed after high temperature exposure and the effect of using LWA, the type of LWA, and compaction method was studied. To do so, visual inspection, residual compressive strength, crack pattern, spalling, and thermoanalytical analysis were conducted. Generally, it could be concluded that concrete formulations with LWA behave more advantageous up to 500 °C, compared to those with quartz gravel aggregates. Moreover, this study found that an ideal type of LWA to produce structural concrete was Liapor HD 5 N, which was used for producing the mixes L1 and L3.
Journal of Cleaner Production, 2015
In this paper the main mechanical properties of concrete produced with recycled aggregates obtained from crushing both structural and non-structural lightweight concrete are characterized. Various concrete mixes with replacement ratios of 20%, 50% and 100% of two types of coarse lightweight aggregates (LWA) by recycled lightweight concrete aggregates (RLCA) were studied in terms of their compressive strength, tensile strength, modulus of elasticity and abrasion resistance. Generally the experimental results show that all the studied properties are improved with the introduction of RLCA. In particular, concrete with RLCA has higher structural efficiency than the reference concrete, with LWA alone. It is thus concluded that more cost-effective structural lightweight concrete (LWC) can be produced with the introduction of RLCA. Moreover, it is shown that the RLCA obtained from non-structural lightweight concrete can be used to produce structural LWC. There is a slight reduction of the concrete's mechanical properties when the stronger LWA is replaced with the more porous RLCA obtained from non-structural lightweight concrete.
Major disadvantages of the ordinary concrete are the high self weight of the concrete and the scarcity of natural resources. An attempt is made for the reduction of the self weight of concrete and the scarcity of natural resources along with increase in the strength and efficiency of the concrete. This experimental research is to analyze the strength parameters of M25 grade concrete made with substitution of ordinary coarse aggregates with various proportions of Light weight expandable clay aggregates (LECA) ranging from 0%, 25%, 50%, 75% and 100% and again for each proportion, natural fine aggregate is replaced with various percentages of copper slag ranging from 0%, 25%, 50%, 75% and 100%. Thus totally 600 concrete specimens are made with 25 mixes. Later 28 days of curing, various strength tests are conducted on the all specimens of modified M25 grade concrete i.e., compression, split tensile, flexural In-plane shear strength through mode-II fracture and impact test. The main intention of this project is to understand better and compare the various strength parameters with those of conventional M25 grade concrete. The obtained end test values are examined to be satisfactory.
2020
AbstractIn pursuit of reducing the dead-weight of precast concrete structures, one approach is by adopting lightweight concrete. EN 13369:2013 specifies a minimum cube compressive strength of at least 18 MPa for the lightweight concrete to be eligible for use in reinforced precast concrete products. This study conducts an experiment using LECA and EPA to produce lightweight concrete for structural use. Density, concrete quality, and strength of various mixes are observed by conducting cube compressive test and UPV test. Two phases of experiments were conducted, where the first phase variable is the percentage of LECA replacing the normal coarse aggregate, while the second phase variable is the percentage of EPA replacing the sand proportion. The optimum concrete mix is found to be the mix with 60% LECA and 50% EPA replacements, which achieved D1.8 lightweight density category that surpasses the specified minimum cube compressive strength and falls under the good quality concrete typ...
Application of Light Expanded Clay Aggregate as Replacement of Coarse Aggregate in Concrete Pavement
The main aim of this project is to develop a light weight concrete (LWC) by replacing the coarse aggregate with light weight expanded clay aggregate. The damage caused in LWC is less significant than conventional concrete and therefore the maintenance cost is also reduced. In order to understand the effect of light weight aggregate in concrete, conventional concrete of strength 30MPa was designed with the density of 2400 kg/m 3. Then the natural coarse aggregates were replaced by clay aggregates and light weight concrete mix of density 1800 kg/m 3 was designed to meet the desired strength requirement. As the density of the concrete tends to be lowered, the strength of the concrete may also tend to decrease. Hence suitable chemical and mineral admixture is to be incorporated in addition to significant water reduction to meet the strength requirement. Cement content kept constant in both the cases. The details of mechanical properties and durability properties of conventional and light weight concrete are reported in this paper.
STUDY ON EFFECTS OF LIGHT WEIGHT AGGREGATES ON COMPRESSIVE AND FLEXURAL STRENGTH OF CONCRETE
The present day world is witnessing construction of very challenging and difficult civil engineering structures. In this study comparison has been made between plain cement concrete and light weight concrete having different proportion of aggregates and admixtures. i.e., Expanded Clay Aggregates: 0%, 25%, 50%, 75% and 100% with coarse aggregate, silica fumes 10% and PVA(Poly Vinyl Alcohol) 1.6% of constant replacement with cement and water respectively. It helps to increase the volume of concrete and hence reduce the weight. In Design of concrete structures, light weight concrete plays a prominent role in reducing the density and to increase the thermal insulation. These may relate of both structural integrity & serviceability. More environmental and economical benefits can be achieved if waste materials can be used to replace the fine light weight aggregate.