recycled aggregate higher water absorption
1 Water absorption and electrical resistivity of concrete
1 1 Water absorption and electrical resistivity of concrete with recycled concrete aggregates and fly ash2 3 Rawaz Kurda1 Jorge de Brito2 José D. Silvestre3 4 CERIS DECivil Instituto
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To reduce the influence of the high water absorption of the recycled coarse aggregate the method of increasing additional water compensation was adopted and the amount of additional water was determined as the amount of water absorbed in 10 min by the recycled coarse aggregate.
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The aggregates size of CB was 20 mm 10 mm and <5 mm with water absorption results 18.4 19.5 and 30.9 respectively. It was concluded that CB had the highest water ab-sorption value followed by RCA and natural aggregate. The high amount of adhered mortar attached to the CB particles led to increase in the water absorption value 3 .
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Recycled aggregate had water absorption of 9.6 . The workability of concrete as the amount of recycled aggregate was increased the concrete required more water to maintain adequate consistency. This was attributed to the angular shape and possibly the water absorption of the recycled aggregate.
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Since RCA generally has higher absorption there is a higher water requirement to achieve the same slump as the same concrete using aggregates. Mixtures containing RCA are creep and shrinkage with the replacement of recycled aggregate 9 20 21 . Fathifazl
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Such and higher absorption levels are generally seen in lightweight or recycled aggregate. The aggregates causes some workability problems in fresh concrete. aggregate has excessive water
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Recycled aggregate had higher needle-chip particle content than the granite aggregate. Its water absorption was far higher than that of granite aggregate. The recycled fine aggregate showed higher sand equivalent and angularity than granite fine aggregate but was sturdy.
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A high water absorption and heterogeneity of recycled aggregate causes difficulties to determine the accurate water from the formulas 32 33 . Moreover the water absorption between the end of
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aggregate. Because of the attached mortar recycled aggregate has significantly higher water absorption than natural aggregate. Therefore to obtain the desired workability of RAC it is necessary to add a certain amount of water to saturate recycled aggregate
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However high water absorption is only an indicator of possible aggregate susceptibility. For example lightweight aggregate concrete is often made with aggregates of higher absorption but has a long track record of being able to resist freeze-thaw conditions.
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Water absorption is the inherent property of the natural aggregates and depends on geological nature of source rocks. However in the recycled aggregates this depends on
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the water absorption of recycled aggregates named "real-time assessment of water absorption." The new approach provides an easier way to obtain the water absorption at different time intervals and without the need of soaking and drying the recy-cled coarse aggregate (5 to 40 mm 0.1968 to 1.5748 in. ).
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Since RCA generally has higher absorption there is a higher water requirement to achieve the same slump as the same concrete using aggregates. Mixtures containing RCA are creep and shrinkage with the replacement of recycled aggregate 9 20 21 . Fathifazl
Get PriceMechanical Performance of Concrete Made with Recycled
Recycled aggregate had higher needle-chip particle content than the granite aggregate. Its water absorption was far higher than that of granite aggregate. The recycled fine aggregate showed higher sand equivalent and angularity than granite fine aggregate but was sturdy.
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aggregate due to the higher absorption of the old mortar attached to the recycled aggregate. Higher content of dust fractions (lower than 0.063 mm) in recycled aggregate causes higher water demand
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characteristic of recycled aggregates for the use in high strength structural concrete which will give a more virtous can be restrained through the choice of water-content ratio and type and dosage of admixtures. However with the recent porosity of RCA leads to a higher absorption. 1.5 Recycling Process
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Such and higher absorption levels are generally seen in lightweight or recycled aggregate. The aggregates causes some workability problems in fresh concrete. aggregate has excessive water
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The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA) and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak
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Apr 04 2015 · In this paper three recycled coarse aggregates (RCAs) with different 24-h water absorptions (5.67 3.12 and 1.98 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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recycled aggregates were highly dependent on the cement. due to higher water absorption in comparison with aggregates. erefore using ne RCA should not exceed percentintheasphaltmixtures. 2. Materials and Methods.. Materials. Water absorption of ne aggregates ( )
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The aggregates size of CB was 20 mm 10 mm and <5 mm with water absorption results 18.4 19.5 and 30.9 respectively. It was concluded that CB had the highest water ab-sorption value followed by RCA and natural aggregate. The high amount of adhered mortar attached to the CB particles led to increase in the water absorption value 3 .
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Dec 02 2019 · Canada Standard Association (CSA A23.1-09 2008) specifies that the maximum water absorption of recycled aggregates is 3 for high quality 3–6 for medium grade and 6 or higher for low grade. However AASHTO MP 16 ACI 555-10 ASTM C33 and ASTM C33 (2016) do not provide a specific criterion for the water absorption of RFA.
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higher absorption of water Content of RCA Amount of water to compensate higher absorption of water Concrete Mixing method Fresh state properties Water absorption Slump maintenance Shrinkage Compressive strength Tensile strength Elasticity modulus This work is part of a research on recycling concrete waste as aggregate
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Higher porosity of RCA leads to a higher absorption. Mix Design It is generally accepted that when natural sand is used up to 30 percent of natural crushed coarse aggregate can be replaced with coarse recycled aggregate without significantly affecting
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Such and higher absorption levels are generally seen in lightweight or recycled aggregate. The aggregates causes some workability problems in fresh concrete. aggregate has excessive water
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Nov 25 2020 · Since RCA present a much higher porosity and water absorption capacity than NA it is expected that RCA show higher values of water by immersion and capillarity. The results support this theory since every mix that incorporates recycled aggregates presents a bigger water absorption than RC.
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The previous studies showed recycled brick aggregate (RBA) had higher porosity higher water absorption and lower density than RCA which led to the degradation of mechanical properties and durability of RAC 26 27 .
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water absorption potential. But recycled aggregates absorb far more water and it is imperative to compensate for this during concrete production. 3. Methods to Determine Density and Water Absorption 3.1. Determination of the density and water absorption according to EN 1097-6 This standard establishes two distinct tests for three size
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• Water absorptionFine RCA > Coarse RCA > Class 5Q Aggregate > RCA RAP > Class 6 Aggregate > LimestoneRCA →higher absorptionAbsorption ↑F-T durability ↓Mixing RCA RAP →absorption ↓(mix until 4.3 absorption)Absorption of coarser RCA < finer RCA (no more than 7 absorption) • Hydrophobicity
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water absorption potential. But recycled aggregates absorb far more water and it is imperative to compensate for this during concrete production. 3. Methods to Determine Density and Water Absorption 3.1. Determination of the density and water absorption according to EN 1097-6 This standard establishes two distinct tests for three size
Get PriceMechanical Performance of Concrete Made with Recycled
Recycled aggregate had higher needle-chip particle content than the granite aggregate. Its water absorption was far higher than that of granite aggregate. The recycled fine aggregate showed higher sand equivalent and angularity than granite fine aggregate but was sturdy.
Get PriceRecycled AggregatesPortland Cement Association
Higher porosity of RCA leads to a higher absorption. Mix Design It is generally accepted that when natural sand is used up to 30 percent of natural crushed coarse aggregate can be replaced with coarse recycled aggregate without significantly affecting
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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
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Abstract. In order to study the capillary water absorption characteristics of recycled concrete (RAC) with different replacement rates of recycled coarse aggregate (0 20 40 and 60 ) in freeze-thaw environment the standard test method of measuring the water absorption of hydraulic cement concrete (ASTM C) was adopted and the influence mechanism of
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not lower the aggregate quality. Experimental results show that the values of water absorption of the pre-treated RA have been significantly reduced with improved mechanical properties for the recycled aggregate concrete. Meanwhile the alkalinity of recycled aggregate concrete chloride and sulphate contents of recycled aggregate have
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One important difference between CRCA and natural aggregates is water absorption. The high water absorption of CRCA is linked to the presence of old mortar (de Juan and Gutierrez 2009). Dry recycled aggregates behave like sponges in fresh concrete thus impacting on the water/cement ratio (w/c) ratio. This ratio
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It depends upon the specific aggregate. Porosity and Water Absorption The crushed concrete aggregate has greater water absorption capacity due to high porosity which is because of adhered mortar. On the other side the source of natural aggregate is rock which tends to have low porosity and low water absorption. Specific Gravity
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