• Resistance to freezing and thawing of recycled aggregate

    This paper describes a laboratory investigation of the resistance to freezing and thawing of recycled aggregate concrete (RAC) compared with that of natural aggregate concrete (NAC).

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  • Recycled Concrete Aggregates: A Review

    Mar 29, 2013· Yang et al attributed a reduction in compressive strength for RCA concrete to the increased water absorption of the aggregate and found that at relatively low water absorption (relatively low RCA fraction) concrete had equivalent compressive strengths while higher RCA fractions and absorption compressive strengths were 60-80 % of that of.

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  • Estimation of Water Absorption Capacity of Hardened

    Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete The high water absorption capacity (WA) of recycled aggregate.

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  • Specific Gravity and Water Absorption Tests on Aggregates

    ** Though high specific gravity is considered as an indication of high strength, it is not possible to judge the suitability of a sample aggregate without finding the mechanical properties such as aggregate crushing, impact and abrasion valu Recommended Values of Specific Gravity and Water Absorption for Aggregates.

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  • Recycling

    Recycled roof tile aggregate has higher water absorption, crushing values and abrasion values than the normal aggregate but exhibits lower specific gravity and bulk density, as shown in Table 2 Aggregates with such characteristic are generally referred to as low-quality aggregates due to the inferiority of such properties to normal concrete.

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  • Mechanical and Physical Properties of Polyester Polymer

    A better mechanical behavior of RBA aggregate was reported, even though it had higher water absorption, compared with RLA aggregate The effect of adding higher amounts of unsaturated polyester resin, to the PC made with recycled basaltic aggregates, caused a general increase of the mechanical strengths and stiffening.

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  • Experimental Study on the Influence of Water Absorption of

    Apr 04, 2015· In this paper, three recycled coarse aggregates (RCAs) with different 24-h water absorptions (567, 312, and 198 wt%) were used to produce recycled coarse aggregate concretes (RCACs) Different water absorption rates were obtained by modifying the surface of RCAs with low and high concentration of alkaline organosilicone modifier that is.

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  • Mechanical properties of recycled aggregate concrete at

    (2) For recycled aggregate concrete at a low water/binder ratio of 0255 prepared in this research, flaws in gravel are the main factor responsible for the decrease in mechanical properties, while flaws in attached mortar are the main factor responsible for the decrease in mechanical properties of recycled aggregate concrete at a high water.

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  • Effects of Recycled Aggregate on Concrete Mix and Exposure

    Concrete mix with 30% recycled aggregate had the lowest chloride penetration after 2 weeks of saturation and performed better than a concrete mix with natural aggregate Owing to the lower density and higher water absorption of recycled aggregates, chloride ion diffusion increased with increasing recycled aggregate content beyond 2 weeks.

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  • Experimental analysis of properties of high performance

    Capillary water absorption of all recycled aggregate concrete was not higher than that of the natural aggregate concrete The fact that RAC introduces higher capillary absorption is attributed to the higher absorption of recycled aggregate in comparison with natural aggregate; this has also been reported by other researchers , , In this study.

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  • Advances in Materials Science and Engineering

    This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios Concrete at two W/B ratios (0255 and 0586) was broken into recycled concrete aggregates (RCA) A type of thermal treatment was employed to remove mortar attached to RCA The RAC at a certain (low or high) W/B ratio was prepared with RCA made.

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  • Home

    Even if recycled concrete aggregate (RCA) can be used us such in concrete by adjusting the mixtures (see results of the French national project RECYBETON), it has higher porosity This impacts the performance of recycled aggregate concrete, resulting in higher porosity, greater water absorption and slightly impaired mechanical performance.

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  • Mix Design and Properties of Recycled Aggregate Concretes

    Aug 26, 2014· It can be noticed in Table 2 that recycled aggregates have a significant higher water absorption capacity and a lower density than natural on In spite of the high water absorption capacity of the used RCA, it remains within the range recommended by the design standards (McNeil and Kang 2013; Kang et al 2014).

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  • Water Absorption Study in Recycled Aggregates for Use as

    because of its high water absorption rate [4] Investigations were carried out on 11 RA samples obtained from 10 demolition sites and a recycling plant The study revealed that in most samples, the water absorption of 10 mm aggregates was higher than 20 mm aggregat It was inferred that smaller size aggregates had more cement.

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  • Recycled Concrete Aggregates: A Review

    Mar 29, 2013· Yang et al attributed a reduction in compressive strength for RCA concrete to the increased water absorption of the aggregate and found that at relatively low water absorption (relatively low RCA fraction) concrete had equivalent compressive strengths while higher RCA fractions and absorption compressive strengths were 60-80 % of that of.

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  • Technical Report Documentation Page

    aggregate are consistent with those reported elsewhere: low specific gravity, higher water absorption, sulfate soundness loss, LA abrasion loss, and thermal coefficient Little variation was observed in the paving operation due to the use of 1 00 % recycled coarse and fine aggregat The moisture control of recycled aggregate, especially.

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  • The Durability of Recycled aggregate Self-Curing Concrete

    Use of recycled materials as aggregates in civil engineering applications is beneficial because it reduces the environmental impacts and cost of obtaining concrete The most significant difference in the physical properties of coarse recycled concrete aggregates RCA reflected in most studies is its higher water absorption capacity as.

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  • Estimation of Water Absorption Capacity of Hardened

    Recycled construction and demolition waste, especially recycled concrete, is able to use as an aggregate for concrete The high water absorption capacity (WA) of recycled aggregate has a negative impact of concrete mix workability and influences the water-cement ratio This paper presents results of experimental measurement of WA of recycled aggregate and recycled concrete.

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  • Recycled Aggregate Concrete

    Nov 15, 2014· Its a lower density , elastic modulus, strength and a higher water absorption capacity recycled aggregate has a proportional mortar which attached to aggregate, it gives a higher porosity and a lower strength to RAC than the normal concrete In addition, since recycled aggregates require a more amount of water than natural aggregate, shrinkage.

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  • Study of recycled concrete aggregate quality and its

    density and absorption Moreover, the study analyses how the recycled aggregate (both percentage and quality) and the mixing procedure (pre-soaking or adding extra water) influence the recycled concrete strength of dif-ferent categories (high or low water to cement ratios) When recycled aggregate absorption is low (under 5%).

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  • Self-compacting concrete with recycled aggregate: A

    and saturated surface dry density and also low specific gravity, high water absorption (Hansen et al, 1993 & Ravindrajah 1985 & Buck 1997) Tavakoli and Soroushian (1996) found that the water absorption capacity of recycled aggregate reflects on the amount of cement paste adhering to the surface of the aggregate particl.

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  • Mechanical properties of recycled aggregate concrete at

    (2) For recycled aggregate concrete at a low water/binder ratio of 0255 prepared in this research, flaws in gravel are the main factor responsible for the decrease in mechanical properties, while flaws in attached mortar are the main factor responsible for the decrease in mechanical properties of recycled aggregate concrete at a high water.

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  • Durability And Performance Characteristics Of Recycled

    As indicated in Table 2, RCA also has a comparatively high water absorption value at 56% Although the water absorption of the recycled aggregate is relatively high compared to the reference basalt aggregate, there was no difficulty in achieving the desired consistency and subsequent compaction of.

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  • Mixture Proportion Design Method of Steel Fiber Reinforced

    1 Introduction Recycled coarse aggregate (RCA) presents a sustainable solution to the depletion of natural coarse aggregate (NCA) resources, and plays a key role in reducing the need for landfilling the waste disposal [1,2,3,4]Because RCA is mainly composed of two different materials, NCA and the attached cement mortar [5,6], it has much higher water absorption and lower apparent density [7,8].

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