Recycled concrete will have a higher absorption and lower specific gravity than conventional aggregates. To produce good quality, durable concrete containing a portion of recycled concrete aggregate often requires trial concrete mixes and close monitoring of the properties of the old recycled concrete, with mix adjustments made, as needed.

The dry density of coarse recycled aggregate is lower than dry density of natural () shows the density of concrete mixes at 28 day age versus percentage of coarse recycled aggregate for various water cement ratios .67,.54,.47 and .42.

Research has shown that this residual mortar causes high water absorption, low density, low specific gravity, and high porosity in RCAs compared to natural aggregates. These effects in the recycled aggregate can decrease hardened concrete properties of recycled aggregate concrete (RAC). According to Abbas et al. (2008), the amount of residual

Using recycled aggregate made it possible to use more SCM as a replacement for cement, producing more dense concrete. The blend of SCM and cement created additional lime to react with slag, resulting in an increase in strength gain and paste density.

Improving properties of recycled concrete aggregates by accelerated carbonation Zengfeng ZHAO* 1,2, Sébastien REMOND 2, Denis DAMIDOT 2, ... the density, the porosity and the water absorption of ... Recycled concrete aggregates, thermogravimetric analysis, carbonation, water absorption,

in recycle aggregate content. The recycled coarse aggregates (RCA) had little influence on the hardened density of concrete and an increase in recycled aggregate content led to a decrease in bleeding capacity. The main drawback of the RCA was the high permeability of the recycled aggregate concrete. The research concludes that

Evaluation of Recycled Concrete, OpenGraded Aggregate, and Large TopSize Aggregate Bases RICHARD D. BARKSDALE, SAMIR Y. ITANI, AND TERRYE. SWOR ... recycled concrete material exhibited slightly lower resilient mod­ ... AASHTO T180 density test method. 5.

nSpecifications for the properties of recycled aggregates for concrete (RILEM,1994) Type 1 Type 2 Type 3 Composition Aggregates from masonry rubble Aggregates from concrete rubble Mixture of natural (min 80%) and recycled (max 20%) aggregate Oven dry density (kg/m3) 1500 2000 2400 Maximum content of foreign matter (glass, bitumen..) (%) 5 1 1

The CTE of the concrete has also been reported to be mainly affected by the type of aggregates used in the concrete (Kosmatka and Panarese, 1988). CTE values for normal concrete are reported to range from to millionths per degree Fahrenheit (Kosmatka and Panarese, 1988).

Natural Aggregate Recycled Aggregate Fig 2: Natural Aggregate and Recycled Aggregate Properties of Coarse Aggregate(Recycled and Natural) Particle Size Distribution The result of sieve analysis carried out as per IS 2386 for different types of crushed recycled concrete aggregate and natural aggregates.

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 Materials, vol. 126, pp. 711–719, 2016.

aggregate by recycled concrete aggregate in the production of concrete on the compressive strength of concrete. Two ... average of three tests. Results and Discussion ... Table 7 Density of NA concrete (kgm3) Mix ratio Age(days) 7 14 21 28

of recycled aggregate concrete were about 90% of that of a normal aggregate concrete with similar mix proportions and ... Bulk Density (kg/l) Percentage Voids (%) ... Average compressive strength of CM Mix ID Average compressive strength

durability properties of recycled coarse aggregate concrete, results and discussion and conclusions. II. MATERIALS The materials used in the experimental investigation are: ... 28 and 90 days. The average value of three specimens was taken as the compressive strength of the concrete.

The study reported in this paper investigates the shear capacity of fullscale reinforced concrete beams fabricated with high volume fly ash and coarse recycled concrete aggregate (RCA). The study involved testing 24 fullscale beams. The beams were fabricated with three different longitudinal reinforcement ratios of %, %, and %.

The Use of Recycled Concrete Aggregate in a Dense Graded Aggregate Base Course ... the moisture content results of the MDI and the nuclear gauge are close but average differences in the dry density results varies from to pcf or % to %. ... /properties would be much different especially if the "dirt" is of a different ...

The crushed stone or crushed gravel aggregate make the asphalt or concrete mix somewhat difficult to place. To improve the workability, many mixes contain both angular and round particles. The coarse aggregate particles are usually crushed stone or crushed gravel, and the fine aggregate particles are usually natural sand.

Performance of Recycled Concrete Aggregate as a Base Course Material in Road Pavements Recycled demolition aggregates as a base course ... • The maximum dry density (MDD) of the CDRB and CCRB ... Average grading (% passing) Min. Max. CDRB CGRB 100 100 100 100 19 .

Recycled aggregate Sunrock also produces recycled aggregate from the reprocessing of waste and demolition concrete and hot mix asphalt pavement. This is an environmentally sound way to preserve existing resources and reduce waste in our landfills.