influence of recycled aggregate content on variability of compressive strength was also determined. 2. Materials and experimental details 2.1. Materials The recycled aggregates employed to produce the concrete were taken from a waste recycling area. They were obtained by crushing unknown waste concrete by use of an impact crusher.
The waste cement content is mostly avoided as it tends to accumulate in the fine by-products,~20% by mass (Shuto et al., 2014). Studies on the use of recycled aggregates and sand in new concrete ...
(5) Aggregate impact value Test on Recycled Asphalt Pavement (2) Specific gravity (3) Water absorption (4) Aggregate crushing value (5) Aggregate impact value (6) Bitumen content Test on Fine Aggregate (1) Gradation (2) Specific gravity (3) Water absorption Two groups of concrete mixes, fresh aggregate concrete (FAC) and recycled asphalt ...
50% and treated recycled aggregate. Test results showed that using treated recycled aggregate improved slightly the shear capacity of the beams in comparison with natural and untreated recycled aggregate. Theoretical predictions of the shear strength of the treated recycled aggregate beams were more conservative compared to the natural and
Particle size distribution curves of recycled aggregates from building demolition concrete crushed by jaw and impact crushers. The jaw crusher produced 60% of coarse aggregates in weight, whereas the impact crusher produced 49% coarse aggregates. The proportion of particles finer than 0.15 mm is around 7–8% weight for both crushing mechanisms.
abr asion value for recycled aggregate was obtained as 47.4% and that for natural aggregate as 29.6%. Water absorption of recycled aggregate (4.2%) was found to be higher when compared to the natural aggregate (0.4%). It was found that compressive strength of concrete made from the recycled aggregate is about 76% of the strength of concrete
Strength of Recycled Aggregate Concrete Kirtikanta Sahoo, P. Sarkar, and Robin Davis P. Abstract— For this data sets are collected and compared with each . Recycled coarse aggregates (RCA) are different in properties and composition than natural coarse aggregate. So it is
The difference between the material passing through the 4.8 mm sieve was 3%, thus, while the concrete mix design of the NA concrete had 46% of fine aggregates, the RA had 49% of fine aggregate. During crushing of the hardened concrete, a significant quantity of fine particles are generated, affecting the average particle size distribution.
Fine aggregate- Fine aggregate size range 150mc to 4.75mm.in present work Banash River (from district Tonk) sand was used with % finer 99.3 with specific gravity 2.62. Coarse aggregates- Coarse aggregates are particles greater than 4.75mm, but generally range between 9.5mm to 37.5mm in diameter. In this case consider aggregate range
recycled fine aggregates. Figure 4. Variation of water absorption vs. replacement ratios of recycled fine aggregates. to the entraining air content, but, in this study, because the specific gravity of waste concrete fine aggregates is lower than that of standard sand, the replacement ratio of waste concrete fine aggregates also should be ...
Note: FA is the fine aggregate, NCA is the natural coarse aggregate, RCA is the recycled concrete aggregate, SP is the superplasticizer. 2.3 Details of test beams Beam specimens were tested to investigate the effects of RCA incorporation on the shear strength of beams without stirrups. A total of ten beams with rectangular cross-
and crushing, these solid wastes can serve as secondary aggregates or recycled aggregates in concrete production. Test results  showed, through a proper treatment process, many building rubbles with various solid waste compositions could be transformed into valuable recycled aggregates for concrete production.
For the research purposes, 16 batches of concrete were made in two groups of 12 batches and 4 batches, respectively. In all series, quartz sand of 0–2 mm fraction was used as fine aggregate. As coarse aggregate, recycled concrete aggregates were used.
Crushing value and Abrasion value: The general trend of crushing and the Los Angeles abrasion test values of recycled concrete aggregates are higher than that of natural aggregates. The variation recorded in crushing tests resulting in values of 23.1% to 42.7% for RCA from different sources against 11-19.4% for natural aggregates.
Abandoned concrete blocks are high-quality concrete aggregates which have many advantages. For example, after the buildings are dismantled, the high-quality concrete blocks and silt after crushing and screening can be used as recycled coarse and fine aggregates for concrete. The fine powder can be directly used as the raw material of cement.
of recycled aggregate. The single crushing process is also effective in the case of recycled aggregate. The particle shape analysis of recycled aggregate indicates similar particle shape of natural aggregate obtained from crushed rock. The recycled aggregate generally meets all the standard requirements of aggregate used in concrete.
The Variation of Concrete Strength using Wastetyre Rubber as Coarse Aggregate ... Materials (coarse aggregate and fine aggregate) + Water. ... Here in figure 7, four different cylinders without waste tyre rubber were using to get theaccurate crushing point.
 X. Yuezhou, The Numerical Simulation and Influence of Aggregate Gradation on the Compressive Strength of Recycled Aggregate Concrete, Xiamen University, 2007.  Z. Zhang, K. Wang, H. Liu, and Z. Deng, "Key performance properties of asphalt mixtures with recycled concrete aggregate from low strength concrete," Construction and Building ...
Clay bricks were crushed manually using a steel hammer, then screened and grouped to different sizes in accordance with ASTM C33 to comply sizes from 19 mm to 4.75 and from 4.75 mm to 0.15 mm for coarse and fine aggregate, respectively. Table 2 presents the physical properties and the grading of the used aggregates.
involves crushing, removing and separation into various sizes and bulks. Reclaimed ... been found that fine recycled aggregates obtained from recycling concrete are more ... of substitution of natural aggregate by recycled concrete aggregate on the compressive strength of the material. Table 1 shows the mix proportion for the three mixes.
The concrete specimen with. recycled coarse aggregate at 28 days of curing has the lowest tensile strength, which was only 1.952 N/mm2. It is around 38.81% drop when compared to control. concrete specimen. There is a drop in tensile strength of 10.66%, 18.18%, 24.76% and …
The recycled coarse aggregates were obtained by crushing demolished residential building in local area. The recycled coarse aggregates used for mixes had average particle size varying from 10mm to 20mm, the specific gravity 2.71 and the water absorption capacity of 3.54 %. The gradation curve as represented in Chart-3 for RCA lies
The results of the calculations for wet strength, dry strength, and wet/dry strength variation for basalt, RAP and RCA are presented in Table 8. As the results of wet/dry strength test shows, the ...
This paper presents an experimental study done on the structural behaviour of recycled aggregate concrete (RAC) beam specimens. Longitudinally reinforced beams with and without transverse reinforcement were tested under two-point bending, at four replacement levels of recycled aggregates (30%, 50%, 70% and ). RAC beam specimens exhibited up to 30% higher ultimate …
made with the fine fraction of CDWRConc. 0, 10, 30, 50 and replacement percentages were tested. The addition of recycled aggregate increases water absorption by immersion, capillary action, chloride migration coefficient and carbonation depth. The addition of superplasticizer produces a variation in properties.
replacement the compressive strength increased from 2.92 Nmm-2 at 7days to 4.66 Nmm-2 at 28days. At complete replacement the compressive strength increased from 2.47Nmm-2 at 7days to 3.37 Nmm-2 at 28 days. Fig. 1 shows the variation of compressive strength with percentage replacement. It can be seen that at any percentage replacement of sand by ...
The amount of crushed aggregate with a grain size of over 20 mm is approximately 28% and the amount with a grain size in the range 10–20 mm is 72%. After crushing, the size of most of the aggregate was less than 20 mm. Such variation in grain size distribution can be important when recycled aggregates are used for compaction materials.
concretes incorporating up to fine recycled aggregates, using standard mixing procedures and economical mix designs. Keywords: Fine recycled aggregate, fine natural aggregate, concrete, compressive strength, replacement. 1. Introduction . Recycling of construction waste material has attained prominence in the last few decades due to the marked
This work intends to evaluate the (mechanical and durability) performance of concrete made with coarse recycled concrete aggregates (CRCA) obtained using two crushing processes: primary crushing (PC) and primary plus secondary crushing (PSC). This analysis intends to select the most efficient production process of recycled aggregates (RA). The RA used here resulted from precast products (P ...
Aggregate crushing was carried out in a Los Angeles drum, in accordance with the requirements of EN 1097-2:2020. The analysis showed that for grits of the 10–14 mm fraction, the lower values of the LA indices were obtained, which allows for obtaining a bigger index of crushing strength than in the case of crushing using the 4–8 mm fraction.
fine and coarse aggregates. 2.4.1 Fine Aggregates. The material which passed through I.S. Sieve No. 480 (4.75mm)is termed as fine aggregates. Function of fine aggregates is to make concrete dense, by filling voids of coarse aggregates, reduces the shrinkage of cement and makes an economical mix. Natural sand or crushed stone dust is used as a ...
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