Dry-loose density. As aforementioned, recycled aggregates have lower specific gravity than that of natural aggregates and consequently the dry-loose density of recycled aggregates is lighter than natural aggregates in the range of 1350 kg/m 3 (Table 1). 3.1.4. Soundness and wear resistance

Both the RDSAC's and RDAC's density decrease with the incorporation of recycled saturated aggregate (RSA) and recycled dry aggregate (RDA), because on the one hand of the lower density of recycled aggregate and, on the other, of the mortar differences induced by the aggregate production and mixing method. The influence of …

The particle density of recycled fine aggregate is 2.38 k/cm 3. Penteado et al. reported similar results using samples of three ... with an increase in the replacement percentage when using recycled fine aggregate from ceramic walls because the dry density of recycled fine aggregate was lower than that of the natural fine aggregate …

According to Poon, et al. [21], the difference in the maximum dry density and the optimum moisture content in recycled aggregates is mainly caused by the density and the high water absorption ...

overall mean oven-dry density (ODD) is 2.319 gr/cm 3 when compared to natural aggregate dry density which is averagely 2.805 gr/cm 3 the density value s of R-RCA are relatively lower. Table 3.

Surface image of natural and recycled concrete aggregates (a, c, e: Recycled concrete aggregate; b, d, f: Natural aggregate) (64-66). Figures - uploaded by Ali Mardani Author content

The saturated-surface-dry (SSD) density of recycled aggregates were lower than that of natural aggregates due to the low density of cement mortar, that was attached to the concrete from which the recycled aggregates derived and many researchers found that the range is in between 2340–2490 kg/m 3. Due to better grading …

As can be seen in the figure, the maximum dry density (MDD) was observed close to zero void curves (ZVC) for both tested samples of D max = 25 and …

This study aimed to improve the carbonation efficiency and reduce processing time of recycled concrete aggregates (RCAs). Different liquid mediums were used for wet carbonation and compared with dry carbonation. ... The lowest water absorption of 12.8 % and highest density of 2210 kg/m 3 were achieved by dry carbonation (C7d), indicating …

The recycled aggregate was used as 0%, 20%, 50% and replacements of coarse natural aggregate. Furthermore, fly ash was employed as 0% and 25% addition of cement.

recycled aggregates, which were cured at 20 C in a water bath [8]. However, with of RCA there was a reduction in by 20-25% as compared to NA, at 28 days. with the same effective w /c of 0.5 ...

The variation in density is dependent on the specific aggregate in question. A study by Limbachiya et al. ( 2000) showed that the relative density of RCA (in the …

Therefore, feasibility of the usage of single used plastic (PET and PE) made aggregates in M20 and M25 grade cement concrete as partial replacement of natural coarse and fine aggregate were ...

The use of the equipment with a rotary drum mill enabled the recycled fine and coarse aggregate satisfying the JASS 5N quality including absolute dry density, water absorption and grain-size distribution [4]. 3. Experiments on the recycled aggregate and the recycled aggregate concrete3.1. From experiments to the on-site trial

The recycled aggregates were of high quality, evidenced by the fact that the oven-dry density and absorption ratio measured after the abrasion using sulfuric acid solution were 2.51 g/cm 3 and 2.3%, respectively, which satisfied the oven-dry density and absorption ratio criteria for Class I concrete, which are "over 2.2 g/cm 3 " and ...

A new systematic firefly algorithm for forecasting the durability of reinforced recycled aggregate concrete. Front. Struct. Civ. Eng. 2022, 16, 329–346. [Google Scholar] Amin, M.; Hakeem, I.Y.; Zeyad, A.M. Influence of recycled aggregates and carbon nanofibres on properties of ultra-high-performance concrete under elevated temperatures.

Only up to 10 to 20 percent fine RCA is beneficial. The aggregate should be tested at several substitution rates to determine the optimal rate. Often recycled aggregate is combined with aggregate when used in new concrete. An example of a mix design using recycled aggregates in a pavement application is shown following table.

3.1 Fresh and Dry Bulk Density, Water Absorption and Porosity of Mortars. A reduction of the bulk density of the fresh mortars, shown in Fig. 2a, occurred when the RFA content increases. This reduction is caused by the lower density of the recycled aggregate (2290 kg/m 3) with respect to natural sand (2370 kg/m 3).

It was noticed that using of recycled aggregate decreased the dry density of pervious concrete and a systematical decreasing in dry density was observed when the natural aggregate replaced with the recycled aggregate at designated levels. The decreasing rate of 8.5 and 10.2 % in dry density were observed when the recycled …

Usually, the international standards restrict the use of recycled aggregates in structural concretes. The acceptable content of recycled aggregates in concrete depends on the desired concrete strength grade and the characteristics of the recycled aggregate, such as composition, dry density, water absorption, and the percentage of …

Physical properties & Density of Recycled Aggregate Concrete. Air Content . The air content in RA is 4%-5.5% higher than natural aggregates. Influence Of Recycling on properties of hardened concrete Compressive Strength. Compressive strength of concrete is reduced from 5% to 25% by using of 50% to recycled …

The relative density (specific gravity) of an aggregate is the ratio of its mass to the mass of an equal volume of water. Relative Density = Mass of the Aggregate / Mass of equal volume of water. Key Features: Most aggregates have a relative density between 2.4-2.9 with a corresponding particle (mass) density of 2400-2900 kg/m3 (150-181 lb/ft3).

The best water content and maximum dry density of all samples are shown in Table 2pared with the JZ sample, the optimum water content of the cement-stabilized macadam mixture increases after mixing RBCP and RBCA, mainly because recycled materials have specific water absorption, and the recycled aggregate is …

The compressive strength of mixes contained recycled concrete aggregate (RCA) at age of 7, 28 and 56 day were less than natural aggregate concrete, except concrete mixes with 20% and 40% coarse ...

This paper studies the change of the particle size distribution of a recycled aggregate coming from CDW due to degradation agents simulated trough 10 wet-dry cycles under controlled conditions.

Table 2 reports the physical and mechanical properties of natural and recycled coarse aggregates. The density, absorption, and crushing value were tested according to the Standard for Technical Requirements and Test Method of Sand and Crushed Stone (or Gravel) for Ordinary Concrete (JGJ52-2019). The content of residual …

Physical characterization shows that recycled concrete aggregate has better physical properties compared with mixed recycled aggregate and ceramic recycled aggregate, …

The moisture content of the saturated surface of dry (SSD) recycled aggregate was , and the moisture content of recycled aggregate was controlled by spray pot prewetting and drying to be 50%, 55%, 60%, 65%, 75%, or , respectively. Air-dry recycled aggregate with a moisture of 25% was the control group.

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 …

The reused or recycled aggregate generated from concrete or asphalt is also considered a resource with additional high value as an option for the natural aggregate resources, ... The primary parameters used to categorize the RCA quality are water absorption and dry density, which played a vital role .

This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture process, inherent defects (e.g. existing of additional interfacial …

The acceptable content of recycled aggregates in concrete depends on the desired concrete strength grade and the characteristics of the recycled aggregate, …