Abstract This research was conducted with the use of recycled aggregate as modification In terms of the use of recycled aggregate the percentage of recycled aggregate should be determined because the strength of concrete would not be obtained by the high percentage of recycled aggregate The scope of study is about comparison between recycle coarse aggregate and natural aggregate in terms of

Read MoreThis paper presents a proposed uniaxial damaged plastic constitutive relation of recycled aggregate concrete RAC based on the experimental studies A total of five groups of RAC specimens with different recycled coarse aggregate RCA replacement percentages of 0 25 50 75 and 100 respectively are tested under both monotonic loading and cyclic loading

Read MoreRecycled concrete aggregate was produced by crushing of old concrete cubes used for compressive strength testing and one precast reinforced concrete column which had inappropriate dimensions Figure 1

Read MoreThe result of the study indicates that the addition of the pulverized bottom ash can 1 increase the compressive strength of the recycled aggregate concrete by 16 relative to a control and 2 dispersing the bottom ash within a water superplasticizer solution can increase the compressive strength of the recycled aggregate concrete by 12

Read MorePerformance of Recycled Asphalt Pavement as Coarse Aggregate in Concrete Fidelis O OKAFOR 52 Figure 1 b Water cement ratio 0 60 Figure 1 c Water cement ratio 0 70 Figure 1 Relationship between compressive strength and age mix 1 2 4 A closer

Read MoreThe possibility of utilizing Manufactured sand M sand and Recycled Coarse Aggregate RCA obtained from Ready Mix Concrete RMC plant to make self compacting concrete is evaluated in this research work In this experiment 25 Concrete mixes are made in

Read MoreEffect of elevated temperature on the compressive strength of concrete element with recycled aggregate was investigated Natural aggregates were replaced with recycled aggregates during casting at 0 25 50 75 amp 100 percentages using water

Read MoreMother Earth is facing major environment related problems today such as global warming and loss of biodiversity This brings in the need for sustainability concepts that meets the

Read MoreExperimental work for the compressive strength of recycled aggregate concrete was designed and performed with 264 cubes The results indicated that the recycled coarse aggregate RCA replacement ratio has a remarkable influence on the compressive strength

Read Morethe concrete compressive strength were 12 3 and 7 8 for concrete mixes casted with 30 RAC over that casted with NA only at 25 oC and 400 oC respectively The replacement of

Read More18 ensp 0183 ensp Mirjana Malešev et al Properties of recycled aggregate concrete Contemporary Materials V −2 2014 Page 241 of 249 aggregate is usually left out in a way that it is completely replaced by the river sand 4 5 Figure 3

Read More29 ensp 0183 ensp a recycled concrete aggregate replacement ratio of up to 80 Yildirim et al 29 suggest that the water to cement ratio the degree of saturation i e absorption and the replacement ratio are negatively associated with the compressive strength of recycled aggregate concrete Cakir 31 investigated that effect

Read MoreRecycled aggregate concrete is considered the next generation in the field of construction it respects the environment solves the problem of debris management and is economically profitable

Read Morereplacement ratio of natural aggregate to recycled concrete aggregate RCCA and the amount of water to cement ratio w c ratio of the mix The significance of the study is that the compressive strength of concrete made with RCCA which is a waste product can be

Read More23 ensp 0183 ensp Recycled concrete aggregate beam with 0 NAC 50 RAC and 100 RAC with three different reinforcement ratios 0 28 1 46 and 2 54 were casted and tested Modulus of elasticity of RAC test result shows slightly lower concrete shows same compressive strength and workability for 50 RAC For 100 RAC with high cement content

Read MoreRecycled concrete aggregate concrete can still be considered as a rigid pavement material when its flexural strength is improved adequately to sustain future traffic loads In this study polyvinyl alcohol PVA a water soluble polymer was used to improve the flexural strength of RCA concrete

Read More1 ensp 0183 ensp was of normal aggregate concrete at 0 replaced by RCA and other are of Recycled aggregate concrete at 20 40 and 60 replaced by RCA The result of the test are shown in the table 1 The compressive strength of the specimens was calculated by following formula F cr P A where F cr P Failure load in Compression KN A Loaded area of

Read MoreTotal four concrete mix batches were tested in which one mix was of normal aggregate concrete at 0 replaced by RCA and other are of Recycled aggregate concrete at 20 40 and 60 replaced by RCA The result of the test are shown in the table 1 The compressive strength of the specimens was calculated by following formula

Read MoreThis suggests that the aggregate strength in combination with the concrete compressive strength may influence the modulus of rupture of RCA concrete Download Download full size image Fig 13 Relationship between modulus of rupture and aggregate

Read MoreRecycled Concrete Aggregate RCA could be a part of the solution because it provides an alternative aggregate to natural aggregates NA Additionally it helps to dispose of construction and demolition waste C amp DW reduces landfill space diminishes environmental pollution decreases transport costs and protects environmental balance 6

Read MoreThe effect of recycled coarse aggregate on concrete compressive strength was investigated based on the concrete skeleton theory For this purpose 30 mix proportions of concrete with target cube

Read More1 ensp 0183 ensp This paper investigates the effect of recycled con crete aggregate RCA on the rate of concrete compressive strength and stiffness gain with time and on the bond strength between seven wire steel prestressing strand and concrete The use of RCA did not have a significant effect on the rate of concrete compressive strength or stiffness

Read MoreKeywords recycled fine aggregate normal‑ and high‑strength concrete high slump compressive and tensile strength elastic modulus Date 1 31 2020 Abstract This study investigated the mechanical behavior of normal strength NS and high strength HS concrete containing recycled

Read Moreaggregate by recycled concrete aggregate in the production of concrete on the compressive strength of concrete Two sets of concrete mixtures of ratios 1 3 6 1 2 4 1 11 2 3 1 1 2 by mass were cast using natural aggregates and recycled aggregates1

Read More15 ensp 0183 ensp the recycled aggregate concrete is almost 85 and 80 of natural aggregate concrete Amn on et al 2002 concrete having a 28 day compressive strength of 28 MPa was crushed at ages 1 3 and 28 days to serve as a source of aggregate for new concrete

Read MoreAccording to a 2004 FHWA study 38 states recycle concrete as an aggregate base 11 recycle it into new portland cement concrete The states that do use recycled concrete aggregate RCA in new concrete report that concrete with RCA performs equal to concrete with natural aggregates

Read More30 ensp 0183 ensp than that of corresponding recycled aggregate concrete The results of the study showed that recycled concrete aggregate can potentially replace completely natural aggregate in the production of both non structural and structural concrete Keywords compressive strength coarse aggregate concrete natural aggregate recycled concrete aggregate

Read Morereduction in compressive strength by up to 15 According to the Japanese standard for use of AGGREGATE CONCRETE Mirjana Malešev et al Properties of recycled aggregate concrete

Read MoreThe results obtained for the mean compressive strength of the concrete produced shows that they all have mean strength greater than 20N mm 2 with fine aggregate from Chanchage having the highest

Read MoreThis chapter intensively studied the strength indexes of recycled aggregate concrete RAC which includes the RAC compressive strength tensile strength flexural strength the

Read MoreThe 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

Read More4 Influencing factors on the modulus of elasticity of recycled aggregate concrete The modulus of elasticity of concrete is known to be influenced by the cement paste the aggregate s nature the interfacial transition zone ITZ and the compacity of concrete Neville 1995

Read MoreAbstract The effect of recycled coarse aggregate on concrete compressive strength was investigated based on the concrete skeleton theory For this purpose 30 mix proportions of concrete with target cube compressive strength ranging from 20 to 60 MPa were cast with normal coarse aggregate and recycled coarse aggregate from different strength parent concretes

Read MoreThe ratios between the elastic modulus and compressive strength for RFA concrete were dissimilar to those for concrete but similar to those for recycled coarse aggregate concrete ACI 14 Building code requirements for structural concrete and commentary 2014 and Model Code Fib model code for concrete structures 2010 overestimated the elastic modulus of RFA concrete

Read MoreConcrete having a day compressive strength of 28 MPa was crushed at ages 1 3 and 28 days to serve as a source of aggregate for new concretes simulating the situation prevailing in precast concrete plants The properties of the recycled aggregate and of the new concrete made from it with nearly 100 of aggregate replacement were tested

Read MoreHigh strength concrete HSC is a topic that has been gaining interest over the years The applications of HSC increased within the last few decades in which HSC was used in high rise buildings Kou and Poon evaluated the mechanical properties of RA made from parent concrete PC that had the 28 days compressive strength ranging between 30–100 MPa

Read More26 ensp 0183 ensp temperature on the concrete compressive strength have been studied Two SF 5 and 10 one FA 35 and three RAC 10 20 and 30 have been used The obtained compressive strength results reveal that the highest values of the concrete compressive strength were 12 3 and 7 8 for concrete mixes casted with 30 RAC over that casted with

Read MoreCompressive 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

Read Moreensp 0183 ensp This paper discusses the suitability of producing concrete with 100 recycled aggregate to meet durability and strength requirements for different applications Aggregate strength gradation absorption specific gravity shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete

Read More2 6 Recycled Concrete as Aggregate for Structural Concrete Production 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

Read MoreCompressive behavior of steel fiber reinforced recycled aggregate concrete after exposure to elevated temperatures G M Chena Y H He a H Yanga J F Chena b and Y C Guo a a School of Civil and Transportation Engineering Guangdong University of Technology

Read MoreThis paper presents a proposed uniaxial damaged plastic constitutive relation of recycled aggregate concrete RAC based on the experimental studies A total of five groups of RAC specimens with different recycled coarse aggregate RCA replacement percentages of 0 25 50 75 and 100 respectively are tested under both monotonic loading and cyclic loading

Read More9 ensp 0183 ensp ABSTRACT Compressive strength is the basic mechanical properties and one of the indicators to determine the performance of a concrete In this paper the effects of various percentages 0 25 50 75 100 of Recycled Aggregate RA on compressive strength of Recycled Aggregate Concrete RAC were investigated RA is used to

Read More2 ensp 0183 ensp This paper provides a systematic review of 119 publications selected from 235 published over a period of 36 years from 1978 to 2014 relating to the effect on concrete compressive strength of the various aspects related to the use of recycled aggregates RA such as replacement level size origin moisture content exposure of the resulting concrete to different environmental conditions

Read MoreTraditionally bond strength between steel bars and conventional concrete made with natural coarse aggregates has been normalized to the square root of the concrete compressive strength f c although this practice has not been universal Zsutty for example found that f c 1 3 provided a better match with data compared with f c 1 2 On the basis of a review of a large number of bond test

Read MoreYoonseok Shin proposed a multiple regression model MRM for predicting the compressive strength of recycled aggregate concrete RAC and the results show that it is useful for predicting the compressive strength of RAC 19 1 3 The Use of Recycled Aggregate Concrete in Construction 3D

Read More21 ensp 0183 ensp The second study examines how the workability and compressive strength characteristics of concrete mixes are affected when varying amount of recycled concrete fines are used as cement replacement Experimental procedures for both studies involved the breaking and crushing of cast concrete blocks to produce recycled materials

Read MoreAn investigation of mechanical behaviour and elastic properties of recycled aggregate concrete RAC is presented RACs were prepared by using a coarse aggregate fraction made of recycled concrete coming from a recycling plant in which rubble from concrete structure demolition is collected and suitably treated Several concrete mixtures were prepared by using either the only aggregates

Read MoreA recycled aggregate concrete RAC with different replacement percentages of recycled coarse aggregates RCAs i e 0 30 50 70 100 was investigated experimentally at elevated temperatures The residual compressive strength as well as the residual flexural strength of the RAC following elevated temperatures was studied and evaluated

Read MoreIn order to investigate the internal curing effect of recycled aggregate RBA in recycled aggregate concrete RAC and calculate its contribution to the final compressive strength two RAC groups with different recycled aggregates and 6 replacement ratios r under 4 curing ages were tested Results show that the compressive strengths of RACI and RACII decrease steadily with the increase

Read MorePrimary concrete of pebble coarse aggregate were used as the source of recycled aggregate concrete for pebble recycled coarse aggregate Replacement rate of recycled aggregate for change parameter 99 specimens were designed The prism compressive

Read MoreProperties of concrete such as compressive strength splitting tensile strength water absorption air permeability and microstructure are studied to evaluate the influence of fibers on the properties of the concrete with recycled coarse aggregates made from waste clay bricks

Read More12 ensp 0183 ensp The recycled aggregate concrete has a compressive strength of at least 76 and modulus of elasticity from 60 to 100 of the control mix Hansen and Narud 5 found that the compressive strength of recycled concrete is strongly correlated with the water

Read More22 ensp 0183 ensp The compressive strength of recycled aggregate concrete was found to range between 18 and 65 MPa and therefore a prediction equation is proposed for recycled aggregate concrete that considers the ratio and types of recycled coarse aggregates used

Read Moreconcrete with recycled coarse aggregate SBR a specimen the maximum compressive stress value is 31 11 MPa and deformation is 0 0014 mm as shown in Figure 3 3 Therefore the compressive test of normal concrete is higher than the compressive test of self

Read MoreExperimental Study of Compressive Strength of Recycled Aggregate Concrete written by Yati R Tank Jigar P Parmar Darpan H Gadhiya published on 2014 04 25 download full article with reference data and citations

Read MoreStudy of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis I Gonz 225 lez Taboada B Gonz 225 lez Fonteboa F Mart 237 nez Abella D Carro L 243 pez Department of Construction Technology E T S

Read More27 ensp 0183 ensp This work studies the physical and mechanical properties of recycled concrete aggregate recycled aggregate from concrete waste and their influence in structural recycled concrete compressive strength For said purpose a database has been developed with the experimental results of 152 works selected from over 250 international eferr ences

Read More2 ensp 0183 ensp Shear strength of recycled aggregate concrete is lesser than of normal concrete This is because the recycled aggregate from field demolished concrete for example can be relatively weaker than a typical natural aggregate In general there is a 10 decrease in strength when recycled coarse aggregates are used

Read More30 ensp 0183 ensp India is presently generating construction and demolition C amp D waste to the tune of 23 75 million tones annually and these figures are likely to double fold in the next 7 years C amp D waste and specifically concrete has been seen as a resource in developed countries Works on recycling have emphasized that if old concrete has to be used in second generation concrete the product should

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