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density with time. Reduction in the 28-day compressive strength of concrete due to complete replacement of natural aggregates with recycled concrete aggregate ranges from 11% to 33%. RCA can replace NA in the production of both non-structural and structural concrete. Garg and Jain (2014), studied on green concrete
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density with time. Reduction in the 28-day compressive strength of concrete due to complete replacement of natural aggregates with recycled concrete aggregate ranges from 11% to 33%. RCA can replace NA in the production of both non-structural and structural concrete. Garg and Jain (2014), studied on green concrete Sep 21, 2018 Concrete specimens are tested after curing at 28 days. Compressive strength results are then used for multiple linear regression by using SPSS version 22 software to get an empirical formula between the compressive strength and percentage of recycled coarse aggregate, the percentage of fly ash and water-cement ratios.
1. Introduction. The aggregates, including sand and gravel, generally take up 6080% of concrete in volume .The recycled use of construction and demolition waste as a substitution of aggregates not only reduces the negative impacts of waste on environment but also maintains the sustainability of limited natural resources 2,3.The properties of fine fraction of recycled concrete aggregates ... Jan 13, 2021 In this study, the idea of recycling the concrete wastes and reuse of them for reproduction of green concrete has been presented. Thus, we have tried to study mechanical parameters using recycled aggregate concrete. For this purpose, three mix designs including natural, recycled and recycled fiber concrete were tested. Moreover, at the end of the paper, estimation of compressive strength
factors on the compressive strength of SCC was also evaluated. So, an overview of the effect of RCA on the compressive strength of the SCC is also provided. III. Results and Discussion Through the analysis of the different articles, five aspects that notably condition the compressive strength of recycled aggregate SCC were identified RCA pose a prediction methodology for recycled concrete compressive strength. There are many variables that influence recycled concrete compressive strength (grading curves, maximum size fraction, natural aggregate source, cement class, possible admixtures, etc.) which have not been taken into account. In
and carried out compressive strength test at 7,14,21, 28 days. The 28 days compressive strength of 12 batches of recycled aggregate concrete which they have obtained is 29.42 N/mm2 which were greater than characteristic compressive strength of 25 N/mm2. The experimental and the theoretical studies about the elasticity modulus and Today, efforts are underway in a number of areas to conserve the environment and protect natural resource. In the construction industry, many researchers have studied the development of new concrete using recycled aggregate (RA). This research proposes a multiple regression model (MRM) for predicting the compressive strength of recycled aggregate concrete (RAC).
Recycled aggregate posses relatively lower bulk density, crushing and impact values and higher water absorption as compared to natural aggregate. The compressive strength of recycled aggregate concrete is relatively lower up to 15% than natural aggregate concrete. Recycled aggregate concrete (RAC), due to its high porosity and the residual cement and mortar on its surface, exhibits weaker strength than common concrete. To guarantee the safe use of RAC, a compressive strength prediction model based on artificial neural network (ANN) was built in this paper, which can be applied to predict the RAC compressive strength for 28 days.
Jun 30, 2021 The compressive strength values of the recycled aggregate permeable concrete under different water-cement ratios and recycled aggregate replacement rates were measured and calculated to determine the relationship between water-cement ratio, recycled aggregate replacement rate, and compressive strength. Recycled aggregate concrete (RAC), due to its high porosity and the residual cement and mortar on its surface, exhibits weaker strength than common concrete. To guarantee the safe use of RAC, a compressive strength prediction model based on artificial neural network (ANN) was built in this paper, which can be applied to predict the RAC compressive strength for 28 days. A data set containing 88 ...
In this paper, concrete mixes utilizing two sizes of natural aggregate and two sources of lightweight and recycled aggregates were used to investigate the effect of aggregate type and specimen size and shape on the compressive strength of concrete. Of Elasticity And Compressive Strength Of Recycled Aggregate Concrete, Journal of Cleaner Production (2015), doi 10.1016/j.jclepro.2015.10.064. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo
May 14, 2015 Compressive strength of concrete produced with the recycled aggregate was in the range of 41 to 52 MPa. Mix 4 had the lowest compressive strength. This was expected due to the nature of grade 4, which has poor particle distribution and contains different impurities. high strength concrete by using different percentage of recycled aggregates. The investigation was carried out using workability test, compressive test, indirect tensile test and modulus of elasticity test. There were total of eight batches of concrete mixes, consists of every 20% increment of recycled aggregate replacement from 0% to 100%.
Mar 01, 2021 Recycled aggregate concrete (RAC) specimens with different watercement ratios and replacement levels of recycled coarse aggregate (RCA) were prepared. The effects of these two factors on the slump and compressive strength of the RAC were analyzed. The Abrams formula was used to predict the compressive strength of the RAC. Waste concrete is the most predominant constituent material among construction and demolition waste. Current waste concrete recycling is limited to the use of recycled concrete aggregates as a road-base material and less as aggregates in new concrete mixes. Further, the production of recycled concrete aggregates results in the generation of a high amount of fines, consisting mainly of cement ...
Jun 07, 2021 A new model based on multiple linear regression analysis of the data from this study and other 14 studies from the literature was developed. The model can be used to predict the compressive strength of general-use concrete mixes with recycled aggregate (2040 MPa) considering both the recycled aggregate content and the curing age of concrete. Apr 25, 2014 From the experimental work Experimental Study of Compressive Strength of Recycled Aggregate Concrete, the following conclusion can be made Recycling and reuse of building wastes have been found to be an appropriate solution to the problems of dumping hundred of thousands tons of debris accompanied with shortage of natural aggregates.
This paper investigates the effect of recycled coarse aggregate incorporation on the relationship between 150 mm cubic and 150 mm cylindrical compressive strength (the reference strength of standards) by comparing data from recycled and natural aggregate concrete compositions in which both cubes and cylinders were tested. Oct 26, 2020 The uniaxial and biaxial compressive strength depends on the strain rates, the stress ratios, and the substitution percentages of RCA of recycled aggregate concrete. The failure modes of RAC under uniaxial and biaxial compression are prism-type and parallel plate-type, respectively.
The compressive cube strength of RAC lies between 19.62 N/mm and 23.65 N/mm though the recycled aggregate concrete. In evaluation of the recycled aggregate characteristics, it should be kept in mind that each recycled concrete aggregate particle is still a piece of concrete composed of the original coarse aggregate (OCA) and the adhered ... Mar 01, 2013 The ANN model, run in a Matlab platform, was used to predict the compressive strength of the recycled aggregate concrete. The results show that ANN has good potential to be used as a tool for predicting the compressive strength of recycled aggregate concrete prepared with varying types and sources of recycled aggregates.
Recycled aggregate concrete (RAC), due to its high porosity and the residual cement and mortar on its surface, exhibits weaker strength than common concrete. To guarantee the safe use of RAC, a compressive strength prediction model based on artificial ... DOI 10.3303/CET1759071 Corpus ID 62884283. A Statistical Study on the Compressive Strength of Recycled Aggregate Concrete articleQin2017ASS, titleA Statistical Study on the Compressive Strength of Recycled Aggregate Concrete, authorLinbo Qin and Zhang Chunhong, journalChemical engineering transactions, year2017, volume59, pages421-426
Using recycled aggregate in concrete is effective in recycling construction and demolition waste. It is of critical significance to understand the fatigue properties of recycled aggregate concrete (RAC) to implement it safely in structures subjected to repeated or fatigue load. In this study, a series of fatigue tests was performed to investigate the compressive fatigue behavior of RAC. Development and statistical database analysis of hardened concrete properties made with recycled concrete aggregates ... This paper deals with the mechanical properties of concrete compressive ...