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water absorption of recycled concrete aggregate

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Influence of Water Repellent Surface Impregnation on Water

This paper aimed to investigate the influence of using silane surface water repellent treatment on the capillary water absorption properties of recycled aggregate concrete. In this study, two types of coarse aggregate, natural aggregates and recycled aggregates were used, and the surface water repellent treatment of concrete was produced by ...

Use of Recycled Aggregates in Construction

4 Use of Recycled Aggregates in Construction TABLE 1 Summary of recycled aggregates in construction TYPE OF AGGREGATE DESCRIPTION APPLICATIONS AVAILABILITY IN AUSTRALIA Manufactured Aggregates Foamed Blast Furnace Slag Water cooled blast furnace iron slag with stream trapped porous mass. Lightweight concrete. Not available.

Mechanical Properties of Recycled Aggregate Concrete at Low

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 (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA.

A new method to determine the density and water absorption of

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 ranges of aggregates.

Water absorption limits on aggregates

The limits on water absorption effectively rule out the use of recycled aggregates as values of 6-7% are typical and would therefore exclude them from water retaining structures. Similarly this applies to many lightweight aggregates.

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Influence of the incorporation of recycled coarse aggregate on

It could be obviously observed that the depth of water penetration into recycled aggregate concrete at the elapsed time of 24 h is greater than that for chloride transport. This result was similar to the previous studies regarding the ordinary concrete without, , , .

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Specific Gravity & Water Absorption of Fine Aggregate

Sep 03, 2013 · Specific Gravity & Water Absorption of Coarse ... Compressive Strength of Cement Concrete Cubes ... SPECIFIC GRAVITY AND WATER ABSORPTION OF FINE AGGREGATE BY PYCNOMETER - Duration: 9:46 ...

Effect of recycled concrete aggregates on strength and

certain RCA properties, in particular water absorption and deleterious material content (such as wood and asphalt), significantly affect the behavior of RCA concrete. RCA concrete is made with RCA as a replacement for natural coarse aggregates. Importantly, the water absorption and deleterious material content of RCA can be measured and

Pre-Saturation Technique of the Recycled Aggregates: Solution

concrete. This standard limits the maximum value of water absorption for recycled aggregates up to 7%. However, the majority of concrete and mixed or ceramic recycled aggregates exceed this value. Recycled aggregates from crushed concrete have a higher percentage of water absorption than natural

Aggregates for Concrete

aggregate content is usually 35% to 45% by mass or volume of the total aggregate content. CHARACTERISTICS OF AGGREGATES. The important characteristics of aggregates for concrete are listed in Table 5-2 and most are discussed in the following section: Grading. Grading is the particle-size distribution of an aggregate as

Residue strength, water absorption and pore size

Before their exposure to high temperature, the concrete produced with natural aggregates attained higher compressive strength and lower capillary absorption capacities than those of the recycled aggregate concrete made with the corresponding binder materials (Portland cement, 35% of fly ash or 55% GGBS).

Recycled Aggregates in Concrete • Aggregate Research

Recycled Aggregates (www.cement.org) — Construction materials are increasingly judged by their ecological characteristics. Concrete recycling gains importance because it protects natural resources and eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or pavement sub-base layers.

Mechanical Properties of Recycled Aggregate Concrete at Low and High Water

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 (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of ...

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Estimation of Water Absorption Capacity of Hardened Concrete

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.

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 (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 stable in concrete.

PROPERTIES OF RECYCLED AGGREGATE CONCRETE

2.3. Water absorption Water absorption of recycled aggregate is a characteristic by which this aggregate differs most from the aggregate obtained from natural resources. According to all available research in this area, it has been shown that recycled concrete aggregate has a significantly higher absorption level compared to natural aggregates.

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Residue strength, water absorption and pore size distributions of

Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures Author links open overlay panel Shi Cong Kou a b Chi Sun Poon a Miren Etxeberria c Show more ...

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Prediction Adequacy of Creep of Recycled Concrete Influenced by the Water Absorption in Recycled Aggregates

A recycled concrete aggregate (RCA) has much higher water absorption content compared to a natural aggregate and could significantly influence the creep properties and durability of concrete. This article investigates the influence of RCA and its water absorption ...

A New Method to Determine the Density and Water Absorption of

A New Method to Determine the Density and Water Absorption of Fine Recycled Aggregates • It is not possible to know how the absorption increases over time since the test only provides the overall/potential water absorption. The amount of water absorbed at the beginning of the test, which is important for the correct dosage of the concrete

Specific Gravity and Water Absorption Tests on Aggregates

Specific gravity test of aggregates is done to measure the strength or quality of the material while water absorption test determines the water holding capacity of the coarse and fine aggregates. Specific Gravity is the ratio of the weight of a given volume of aggregate ...