durability of structural recycled aggregate concrete

durability of structural recycled aggregate concrete


Effect of nano-strengthening on the properties and

Influence of nano-strengthening immersion on the properties of recycled aggregate (RA) and recycled aggregate concrete (RAC) and the microstructure of interfacial transition zones (ITZs) between mortar and aggregate were studied in this paper. Results showed that nano-strengthening immersion was helpful to reduce the crushing value and total pore area of RA, to significantly improve the

Learn More

Sustainability Improvements in the Concrete Industry - Use

Focusing on techniques that limit the environmental impacts of the concrete industry, the text explores the use of recycled components in the place of aggregates and ordinary binders. Chapters focus on topics including processing procedures, mixture proportioning, mechanical properties, durability and structural applications.

Learn More

Strength and Durability Properties of Treated Recycled

The use of recycled aggregate (RA) generated from construction and demolition (C&D) waste to produce new concrete would minimize the need for the use of natural aggregate (NA). The authors propose a new hybrid method in the present work by combining presoaking in mild acetic acid followed by mechanical grinding to produce high-quality RA.

Learn More

Durability of recycled aggregate concrete - A review

Although the researches on recycled aggregate concrete (RAC) has been going on for nearly 70 years , the use of RA in concrete structures is still limited due to its long-term durability concerns. With the decrease of natural aggregate resources and the increase of waste concrete generation, RAC has become a hot research topic around the world.

Learn More

PDF) A Review on Strength and Durability Studies on

J Mater Sci 2007;42:2917-33. geopolymer concrete containing recycled concrete aggregate, [2] Davidovits J, Buzzi L, Rocher P, Marini DGC, Tocco S. where the source material for geopolymer was waste paper Geopolymeric cement based on low cost geologic sludge ash instead of popularly used fly ash and slag.

Learn More

End of life recycling

Recycled concrete is a viable source of aggregate and has been satisfactorily used in granular subbases, soil-cement, and in new concrete. Recycled aggregates are classified in one of two ways, as: Recycled Aggregate (RA), or as. Recycled Concrete Aggregate (RCA). With a growing commitment to recycling construction waste materials, there is now

Learn More

Strength and Durability Evaluation of Recycled Aggregate

May 14,  · Influence of recycled concrete aggregate on concrete durability. Paper presented at the National Laboratory of Civil Engineering, Portugal. Gupta, Y. P. ( ). Use of recycled aggregate in concrete construction: A need for sustainable environment. Paper presented at the our world in concrete and structures, Singapore. Hansen, T. C. (1986).

Learn More

Recycled concrete could be a sustainable way to keep

The recycled concrete replaces the natural aggregate for producing new concrete. "The composition of the recycled concrete gives that product additional flexibility and adaptability," says Alam.

Learn More

Use of Recycled Aggregates made from Construction and

Apr 24,  · The recycled concrete aggregates investigated have offered an internal friction angle of 47o and an absorption coefficient of 2.25%. A UCS value of 2.56 MPa at 7 days has been obtained for a cement content of 5.0%. The Catalogue of pavements and construction units with recycled aggregates fro

Learn More

Home - Recycled Aggregate Products

Engaged in the "green" practice of recycling concrete and asphalt materials since 1989. Business Hours; Our other "green" practices include: Save time and transport costs, easily accessible off I-25 and Circle Drive on the south side of Colorado Springs. Reduce your landfill footprint. Dump fees are more affordable.

Learn More

Concrete recycling - Wikipedia

Concrete recycling is the use of rubble from demolished concrete structures. Recycling is cheaper and more ecological than trucking rubble to a landfill. Crushed rubble can be used for road gravel, revetments, retaining walls, landscaping gravel, or raw material for new concrete.Large pieces can be used as bricks or slabs, or incorporated with new concrete into structures, a material called

Learn More

Research Article Durability Indicators in High Absorption

suitable for durability (.) and the highest w/c suitable for strength (. ). e materials used were OPC, water, coarse aggregateand neaggregate,obtainedbycrushinglimestone from a local quarry, and recycled coarse aggregate recovered by cutting and grinding heterogeneous structural concrete rubble. Aggregate properties were determined according to

Learn More

Microstructural Characterization of Concrete Prepared with

An interesting, yet challenging, application for recycled CDW is the replacement of natural aggregates (both fine and coarse) by recycled concrete aggregates (RCA) in the production of structural concrete. As aggregates in concrete comprise 60–75% of the total material volume (Cachim, Reference Cachim ), any reduction in natural aggregate

Learn More

Influence of mixing approaches on strength and durability

Sep 04,  · Concrete made with RA have lower strength and durability properties when compared with natural aggregate concrete (NAC), recorded by many previous researches in past. In order to overcome these difficulties, two‐stage mixing approach (TSMA) is a good tool to improve the properties of recycled aggregate concrete when compared with normal

Learn More

DURABILITY OF GREEN CONCRETE WITH TERNARY

The use of recycled aggregates (RA) is an important step forward in the development of a more sustainable society. More recent researches on concrete made with coarse recycled concrete aggregates and fine recycled concrete aggregates (FRA) have led to positive results concerning the use of RA in structural concrete [20-24].

Learn More

PDF Energy Efficiency Aspects of Recycled Aggregate Concrete

together with recycled concrete (RB) and recycled brick (RO) aggregates 4-8 mm and 8-16 mm. For concrete mixtures with 40 % of recycled aggregate, natural crushed aggregate 4-8 mm was also used. Recycled concrete aggregate was produced by crushing laboratory specimens, while recycled brick was produced by crushing waste brick.

Learn More

Recycling of construction and demolition waste as natural

All recycled concrete mixtures were evaluated both in fresh and hardened state, focusing on the effect that the use of each recycled aggregate type or correction technique has on the microstructural, mechanical and durability properties of the resulting recycled concrete. Characterization of properties of fresh recycled concrete.

Learn More

Part II: Durability Assessment of Recycled Concrete

This Phase II investigation into the durability of new concrete incorporating recycled concrete aggregates (RCA) focused on several goals: 1) Provide corroboration of results obtained in Phase I for a multi-laboratory study related to assessing alkali-silica reactivity (ASR) of RCA in accelerated laboratory tests; 2) Investigate the efficacy of mitigation methods to control ASR in concrete

Learn More

EFFECT OF RECYCLED COARSE AGGREGATES ON

improvements in the durability of concrete and the beter use of recycled materials. The depletion in the supply of the use of recycled aggregates in concrete will be advantageous economically and in the long run, prove to be sustainable. In general, aggregate occupy 55 – 80% of concrete volume.

Learn More

Durablity Performance of Recycled Aggregate Concrete

The effects of using crushed waste concrete as course aggregates upon compressive strength and durability against to carbonation and sulfate attack were investigated. Waste concrete cubes, which had been tested for compressive strength in compliance with construction specifications, were crushed and utilized as coarse recycled concrete

Learn More

Durability Of Concrete In Cold Climates Modern Concrete

including, but not exclusive to the production of low-energy cements, cement admixtures and concrete aggregates Presents expanded coverage of the suitability and durability of materials aggregates and additives Specifications for Structural Concrete, ACI 301-05, with Selected ACI References Page 2/10

Learn More

Inquiry