STUDY ON STRENGTH OF CONCRETE BY USING RECYCLED AGGREGATE FROM DEMOLITION WASTE IN CONCRETE (original) (raw)
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Use of Recycled Concrete Aggregate and its Influence on Strengths of Concrete
International Journal of Trend in Research and Development, Volume 4(4), ISSN: 2394-9333, 2017
In our present society the major challenges is protection of environment. Cities are suffering because of their own Construction and Demolition Waste (CDW) with serious environmental consequences. Reducing, recycling and re-using appear to be the best option. Concrete deterioration may be due to many reasons: Corrosion of enclosed metals, Chemical attack, Alkali-Aggregate reactivity, Fire, Overloaded, etc.The techniques for producing concrete using recycled aggregate obtained from CDW. Also the effects are studied on the compressive strength and flexure strength of concrete conducting various laboratory trials, replacing the natural aggregate by the recycled ones. Replacement of aggregates is done in percentage. So in this project, concrete was tested made from recycled aggregates replacing natural aggregates. Such that the recycled aggregates were sub-graded, with respect to the service life of the parent concrete.Finally, the investigation and comparison of experimental results of strengths of natural aggregate concrete and recycled aggregate concrete with the help of statistical data obtained by testing of specimen was done, as per recommended procedures by IS 516:1959.
Comparative Study of Concrete Using Recycled Coarse Aggregate
International Journal for Research in Applied Science and Engineering Technology
Recycled coarse aggregate (RCA) is produced by crushing the demolition waste from concrete structures. The construction and demolition waste is primarily used for landfill sites which are causing significant damage to the environment and developing serious problems. The use of the RCAs created from the processing of construction and demolition waste in new construction has become more important over the last two decades as it conserves the non-renewable natural resource of virgin aggregates. With a view to the above needs, the present study is aimed to determine the strength properties of RCA concrete depending on the various content of RCA and to compare them to the strength properties of concrete made with natural coarse aggregates (NCA). The fine aggregates of high FM of 3.0 were used for recycled and natural concrete. After performing the compressive strength test, it was found that concrete made with fully replaced RCA has less strength than concrete made with NCA but not much. So, RCA can be used as a replacement for NCA in concrete production. In addition, full replacement of RCA can be used in structures of less importance such as temporary walls, the base of roads, light traffic roads, pavements in college campuses etc.
Use of Recycled Concrete Aggregate in Construction
– Recycled aggregates comprised of crushed, graded inorganic particles processed from the materials that have been used in the constructions and demolition debris. This study aims to develop the best economic solution by use of that demolition debris as recycled aggregate in structural concrete to reduce the environmental impact, the main objective of this paper is to investigate the hardness properties of Recycled Aggregates & Recycled Concrete Aggregate including abrasion test, impact value test & water absorption test on aggregates while slump, compressive strength, tensile strength & modulus of elasticity on fresh & hard concrete, which will give a better understanding on the properties of concrete with recycled aggregates, as an substitute material to virgin coarse aggregate in structural concrete. To determining the above properties of the recycled aggregate by studying the influence of limited percentage of recycled aggregate in concrete. The Laboratory trials were conducted with the aggregate size of 10-20mm, there were total of six batches of two concrete mixes M30 with 0.42 w/c & M20 with 0.5 w/c, consist of 00%, 40% & 60% of recycled aggregate replacement. The workability of concrete will be decreased as the amount of recycled aggregate increased but in the end, is considerable in the mix as it is still under the limits. This was evaluated through standard slump test. For strength characteristics, the results showed a gradually decreasing in modulus of elasticity, tensile strength, compressive strength as the percentage of recycled aggregate used in the specimens increased but at last most of the results were satisfactory & under the limits.
Influence of recycled concrete aggregates on strength properties of concrete 2 Literature Review
Recycling is the act of processing the used material for use in producing new product. The use of naturally available aggregate is getting more and more intense with the advanced development in infrastructure area. In order to reduce the usage of natural aggregate, Recycled aggregate concrete can be used as the replacement materials. Recycled aggregate concrete are consists of crushed concrete, inorganic particles processed from the materials that have been already used in the structural constructions and demolition waste. New technologies have evolved very fast to cater different difficulties in the construction industry, Production of concrete which will leave a substantial mark on the environment. The concrete is made with concrete wastes which are eco-friendly to environment is known as Recycled aggregate concrete. This thesis covers the aspect on how to choose a material for Recycled aggregate concrete. By the use of Recycled aggregate concrete it is possible to reduce the CO2 emission in atmosphere. To avoid the pollution and reuse the material, the present study is carried out. In this study the laboratory test results indicates that as the percentage of Natural Aggregate in the mixture decreases by replacing the Recycled Aggregate, the corresponding strength of these mixtures goes on decreasing, however up to the 60% replacement level, it achieves target mean strength. Hence, for the structural concrete Natural Aggregate can be replaced by the Recycled Aggregate up to 60% range. I INTRODUCTION: To achieve sustainable issue in construction area, researchers and companies focus on using waste concrete as a new construction material. It is called recycled aggregate which can be produced by concrete crusher. The aggregates are categorized by size as coarse and fine aggregate. If recycled aggregates were practically useful in construction area, two aspects would be expected. One is illustrated at the beginning of introduction; the other one is that we could reduce consumption of natural aggregate resources. Although using recycled aggregates has great opportunity to preserve healthy environment, the properties and characteristics of recycled aggregates has not been fully investigated yet. Since it is hard to standardize the characteristic of recycled aggregates, all the researchers who study recycled aggregate should perform experiment of their concrete, which will be used for recycled aggregate, to gain the characteristics of their specimens. The characteristic of recycled aggregates could be different by its parent concrete because the parent concrete was designed for its purposes such as permeable, durable and high strength concrete. For example, water to cement ratio of parent concrete will give an impact on water absorption capacity of recycled aggregates which is related to characteristics of concrete issue such as durability, permeability, strength and elastic modulus. Limbachiya et al., (2000)[1] found that Recycled aggregate concrete had 7 to 9% lower relative density and 2 times higher water absorption than natural aggregate. According to their test results, it shown that there was no effect with the replacement of 30% coarse Recycled aggregate concrete used on the ceiling strength of concrete. It also mentioned that Recycled aggregate concrete could be used in high strength concrete mixes with the Recycled aggregate concrete content in the concrete.
EXPERIMENTAL INVESTIGATION ON CONCRETE USING RECYCLED COARSE AGGREGATE
IRJET, 2023
This project deals with the excremental investigation on the properties of concrete using recycled coarse aggregate. In this project the M30 concrete mix is selected and the compression and tensile tests are carried out for the hard concrete. Due to the rapid population growth and rapid urbanization the natural resources are depleting day by day. So the natural aggregates are very hard to obtain. So many people are opting to use recycled aggregates in construction. The cost of good quality crushed aggregates as compared to recycled aggregate is also very high due to the high demand of it in construction works. Recycling of stone, aggregate, will reduce the quarrying and mining of stones thereby reducing the use of natural resources excessively. The land surface can be prevented from any unwanted dumping of wastes and hence ecological disturbances will be reduced. To conserve the conventional natural aggregates for other important construction works. The slump test is carried out in the project to investigate the workability of fresh concrete. The slump of the concrete mix is recorded as 130mm.The preliminary tests are also carried out for this project such as, Water absorption test, fineness modulus test, bulk density test etc. Methodology of project, test results and discussion are enclosed in this report.
Recycled Concrete aggregates (RCA) are comprised of crushed, graded inorganic particles processed from the materials are used in the constructions industry. The aim of this project is to determine the strength characteristics of recycled aggregates for application of structural concrete in high strength, which will give a better understanding on the properties of concrete with RAC, as an alternative material to coarse aggregate (NA) in structural concrete. The scope is this project is to determine and compare the strength of concrete by using different percentage of recycled concrete aggregates. Recycled aggregate is also the type of artificial aggregate which is obtained from (C&D) wastes i.e. Construction and demolition. Constructions and demolitions are processes that go hand in hand. In India the demolished building rubble generally goes to waste materials in landfills. Recycling of these concrete waste materials from demolition building can provide a solution to this problem. The investigation was carried out using Specific gravity test, sieve analysis test, Impact test, Water absorption test, Crushing value test, Workability test and compressive strength test. There are total six batches of concrete mixes, consisting of every 20% increment of recycled aggregate replacement, from 0% to 100%.
Comparative Strength Studies of Recycled Aggregate Concrete and Fresh Concrete
The waste generated during the construction and demolition activities include sand, gravel, concrete, bricks, metal, plastic, glass etc. This construction and demolition waste is mainly disposed in landfills. Recycling and reuse of this waste will result in preservation of natural resources, effective utilization of growing waste stream, saving landfill space. This paper discusses the utilization of recycled aggregates as coarse aggregates in the preparation of concrete. In the present study, fresh concrete and recycled aggregate concrete (RAC) cubes are prepared and tested for compressive strength at the end of 7th, 14th and 28th days curing. The results are compared for both the types of concrete.
A Review Paper on Use of Recycled Concrete Aggregates in Concrete Manufacturing Process
Construction industry generates large amount construction & demolition waste. This waste may be in the form of debris & building materials such as broken bricks, mortar, concrete, steel. At the same time foundry industry also generates large amount of waste sand. The foundry sand is sand used for the formation of moulds essential in the casting process. After the completion of its usefulness, it is dumped in open areas or low laying areas.The waste from construction & demolition are also dumped in open land & low laying areas. This process disturbs the environment & pollutes the ground water (SayeedJaved, 1992). The reuse of this waste will not only reduce the cost of disposal along with land requirement but also be useful in environment by conserving the use of natural aggregate. Concrete is the world's second most consumed material after water, and its widespread use is the basis for urban development. It is estimated that 25 billion tonnes of concrete are manufactured each year. On the other hand over 1 billion tonnes of construction and demolition waste (C&DW) is generated every year worldwide. Crushed concrete is available nowadays in large quantities, which also results from the demolition of old structures and waste concrete from new structures. Every year, it is estimated that 2% to 10% (average of 5%) of the estimated ready mixed concrete produced is returned to the concrete plant which is also of great concern to dispose off. The use of the recycled aggregates created from construction and demolition waste in new construction has become more important over the last two decades. Waste minimization and reducing the burden on landfills is a global issue. Extensive research has been carried out worldwide on the use of recycled aggregate in concrete. This includes substantial research reports by WRAP4, NRMCA5 and RILEM6. Globally the concrete construction industry has taken a responsible attitude to ensuring its natural resources are not overexploited. The reuse of hardened concrete as aggregate is a proven technology-it can be crushed and reused as a partial replacement for natural aggregate in new concrete construction. Recycling construction waste is vital both in order to reduce the amount of open land needed for land filling and to reduce depletion of raw materials. Recycling or recovering concrete materials has two main advantages-it conserves the use of natural aggregate and the associated environmental costs of exploitation and transportation, and it preserves the use of landfill for materials which cannot be recycled. Many attempts to develop high-grade uses of construction waste, i.e., as aggregate for the manufacturing of new concrete, are made in last few decades. A decrease in the compressive strength was generally observed in all concretes in which the natural coarse aggregate was replaced with recycled aggregate prepared by the crushing of old concrete. In the current paper we are going to study the feasibility of Recycled Aggregate in concrete manufacturing when it is blended with different proportions of fly ash and admixtures. We are going to study strength characteristic of concrete made with optimum proportions of ingredients. The study will give idea for the effective use of waste concrete which benefits sustainable development by reducing the necessity of land required for dumping waste concrete. " II. LITERATURE REVIEW " They conducted an experimental investigation to study the mechanical as well as micro structural properties of recycled aggregate concrete (RAC) exposed to elevated temperature.
The Effect on the behavior of Concrete by using Recycled Aggregate Concrete
This research review represents the collection of data from various previous studies done on the behavior and properties of recycled aggregate concrete. Construction industry generates large amount construction & demolition waste. This waste may be in the form of debris & building materials such as broken bricks, mortar, concrete, steel. At the same time foundry industry also generates large amount of waste sand. The foundry sand is sand used for the formation of moulds essential in the casting process. After the completion of its usefulness, it is dumped in open areas or low laying areas. The waste from construction & demolition are also dumped in open land & low laying areas. This process disturbs the environment & pollutes the ground water. Recycled aggregates concrete utilizes materials from concrete and masonry constructions. Reuse of demolition waste avoids the problem of waste disposal and is also helpful in reducing the gap between demand and supply of fresh aggregate. Many researchers state that the recycled aggregates that are obtained from concrete specimen make good quality concrete. For improving the quality of recycled coarse aggregate, various surface treatment methods such as washing the recycled aggregates with water and diluted acid were investigated. Strength properties of the treated and untreated coarse aggregate were compared. The results indicated that the compressive strength of recycle aggregate is found to be less than the natural aggregate. A lot of experiments have been made to investigate the strength behaviour of recycled aggregate concrete using demolition waste. The behaviour of concrete like workability, variation of strength made with recycled aggregate is more or less similar to conventional concrete. A comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the paper. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes and precast concrete columns. Three types of concrete mixtures were tested: concrete made entirely with natural aggregate (NAC) as a control concrete and two types of concrete made with natural fine and recycled coarse aggregate (50% and 100% replacement of coarse recycled aggregate).
A Review on Recycled Concrete Aggregates
After demolition of old bridges and buildings, the removed concrete is often considered useless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created. This paper focuses on the coarse RCA which is the coarse aggregate from the original concrete that is created after the mortar is separated from the rock which is reused. The use of RCA in new construction applications is still a relatively new technique. In This paper discusses the properties of RCA and the effects of RCA use on concrete material and the large scale impact of RCA on structural members. Literature survey reveals that compressive strength primarily depends upon adhered mortar, type of aggregates, age of curing and ratio of replacement from new material to aggregate and cement, water absorption, strength of parent concrete, interfacial transition zone and moisture content.Finally, it recommends a cessation on the need for the use of recycled concrete as aggregates in concrete in respect of mainly the compressive strength.