How do recycled concrete aggregates modify the shrinkage

How do recycled concrete aggregates modify the shrinkage ...

Feb 01, 2018  The autogenous shrinkage of recycled aggregate concrete was approximately 40–50% lower than for the conventional concrete, and finally negligible for the concrete with 100% coarse RCA. This can be attributed to the influence of initial water content of the recycled concrete aggregate.

get price

How do recycled concrete aggregates modify the shrinkage ...

The recycled concrete mixtures were designed by replacing natural aggregates with 0%, 30%, and 100% of recycled concrete gravel (RG) and 30% of recycled concrete sand (RS). The water to equivalent binder ratio was kept constant and recycled concrete aggregates were initially at saturated surface dried (SSD) state. The contribution of the ...

get price

How do recycled concrete aggregates modify the shrinkage ...

Abstract This paper presents the main results of a research carried out to analyze the mechanical properties, intrinsic permeability, drying shrinkage, carbonation, and the self-healing potential of concrete incorporating recycled concrete aggregates. The recycled concrete mixtures were designed by replacing natural aggregates with 0%, 30%, and 100% of recycled concrete gravel (RG) and

get price

How do recycled concrete aggregates modify the self ...

Nov 16, 2017  The correlation between drying shrinkage and mass-loss through "drying depth” concept showed that recycled concrete aggregates are affected by drying as soon as concrete is exposed to desiccation. A good correlation between 1-day compressive strength and

get price

Shrinkage and creep in structural concrete with recycled ...

Dec 20, 2019  1. Introduction. The recycling of aggregates from construction and demolition waste (CDW) has become a priority for the European Union , , due to the costs involved in the extraction and dumping of natural aggregates and the environmental impact linked to this activity.. According to studies carried out in Spain , the most common components of CDW are ceramic materials (54%), and concrete ...

get price

Autogenous Shrinkage in Structural Concrete Made with ...

Jul 14, 2021  The recycled concrete mixtures were designed by replacing natural aggregates with 0%, 30%, and 100% of recycled concrete gravel (RG) and 30% of recycled concrete sand (RS).

get price

Autogenous-shrinkage model for concrete with coarse and ...

Aug 01, 2020  Abstract. Autogenous shrinkage of recycled-aggregate concrete (RAC) is important for design of concrete structures with recycled aggregate, however, there are few studies on this critical topic. To address this, an experimental research study was undertaken to investigate the autogenous shrinkage of RAC made with fine and coarse recycled ...

get price

Autogenous Shrinkage in Structural Concrete Made with ...

Jul 14, 2021  10%  How do recycled concrete aggregates modify the shrinkage and self-healing properties? Cement Concr. Compos. 86, 72–86 (2018) CrossRef Google Scholar. 8. Maruyama, I., Sato, R.: A trial of reducing autogenous shrinkage by recycled aggregate. In: Proceedings of 4th international seminar on self-desiccation and its importance in concrete ...

get price

Laboratory Investigation on the Shrinkage Cracking of ...

Apr 12, 2019  However, the shrinkage resistance of recycled coarse aggregate concrete was less than this of natural coarse aggregate concrete. Manzi et al. [ 18 ] researched that short and long-term behaviour of structural concrete with RAs by adjusting and selecting the content and grain size distribution of concrete waste with a high content of RAs ...

get price

Shrinkage and creep in structural concrete with recycled ...

Dec 20, 2019  1. Introduction. The recycling of aggregates from construction and demolition waste (CDW) has become a priority for the European Union , , due to the costs involved in the extraction and dumping of natural aggregates and the environmental impact linked to this activity.. According to studies carried out in Spain , the most common components of CDW are ceramic materials (54%), and concrete ...

get price

Autogenous-shrinkage model for concrete with coarse and ...

Aug 01, 2020  Abstract. Autogenous shrinkage of recycled-aggregate concrete (RAC) is important for design of concrete structures with recycled aggregate, however, there are few studies on this critical topic. To address this, an experimental research study was undertaken to investigate the autogenous shrinkage of RAC made with fine and coarse recycled ...

get price

Recycling concrete as fine aggregate in concrete ...

Nov 01, 1987  The increase in shrinkage for concrete with crushed concrete fines may be due to the combined effects of two factors, namely the lower aggregate stiffness and shrinkage of cement paste component in crushed concrete fines. ... The pozzo- lanic activity of pulverised fuel ash may also modify the internal pore system and thus causing lower ...

get price

Recycled Aggregates - Portland Cement Association

According to a 2004 FHWA study, 38 states recycle concrete as an aggregate base; 11 recycle it into new portland cement concrete. The states that do use recycled concrete aggregate (RCA) in new concrete report that concrete with RCA performs equal to concrete with natural aggregates.

get price

Potential use of recycled aggregate as a self-healing ...

Jan 01, 2020  The drying shrinkage of recycled concrete increases with the replacement ratio of recycled aggregate and the water–cement ratio. However, when a certain amount of fly ash and water-reducing agent are mixed in the test piece, the drying shrinkage rate of the recycled concrete is lowered. ... How do recycled concrete aggregates modify the ...

get price

Recycled Aggregates for Concrete: Problems and Possible ...

When preparing HRH (recycled concrete with concrete aggregate)with 20%, 50% and 100% of recycled concrete coarse aggregate > 4 mm and with the same quantity of fresh mortar, very low increase of the mercury intrusion porosity was observed for

get price

(PDF) Improvement of Recycled Aggregates Properties by ...

Jul 16, 2021  An assessment of microcracks in the interfacial transition zone of recycled concrete aggregates cured by CO2. The effect of carbonation on the properties of recycled concrete aggregate

get price

Crushed Concrete Aggregates - Properties and Uses of ...

🕑 Reading time: 1 minuteCrushed concrete aggregates also called as recycled concrete aggregates are fragments and pieces of concrete buildings which are demolished or rebuild. These crushed concrete are cleaned from dirt and broken to smaller pieces to manufacture aggregate which is termed as recycled aggregate. Crushed concrete aggregate eliminates the need for disposal by []

get price

Effect of Recycled Aggregates Concrete Construction Magazine

Nov 03, 2010  Q: How do the properties of recycled-aggregate concrete compare to those of concrete made with natural aggregates? A: The Portland Cement Association's website (cement) has lots of good information about concrete technology. They answer this question as follows: Recycled aggregates typically have higher absorption and lower specific gravity than natural aggregate and produce concrete ...

get price

Influence of service time of recycled coarse aggregate on ...

Sep 04, 2019  Crushing waste concrete as aggregates for recycled aggregate concrete (RAC) production represents an alternative to preserve natural resources and reduce the need for disposal [1, 2].A certain amount of old mortar from the parent concrete (i.e. demolished concrete) remains attached to the original virgin coarse aggregate when crushing, which makes recycled coarse aggregate

get price

Drying Shrinkage

All portland cement concrete undergoes drying shrinkage or hydral volume change as the concrete ages. The hydral volume change in concrete is very important to the engineer in the design of a structure. Drying shrinkage can occur in slabs, beams, columns, bearing walls, prestressed members, tanks, and foundations.

get price

Cracking Susceptibility of Concrete Made with Recycled ...

cost of landfilling waste material rises, the need for alternative aggregates and recycling of waste material will increase. Using recycled concrete aggregates (RCA) in new concrete is one way to address both of these issues. However, there has long been a concern that RCA may negatively affect the properties of new concrete in which it is ...

get price

Reducing Shrinkage Cracking of Structural Concrete Through ...

Mar 31, 2006  Aggregate 3, crushed dolomitic limestone. Fresh concrete mixtures had an air content of 6 ± 1.5% and slump of 1 to 4 inches. Sealed beam specimens were used to evaluate the autogenous shrinkage of concrete up to the age of 56 days following JSCE procedure. ASTM standard test method (C 157) was used to evaluate the drying shrinkage of concrete ...

get price

Restrained shrinkage cracking of recycled aggregate concrete

Jul 27, 2017  The increase in drying shrinkage and decrease in tensile properties of concrete proportioned with recycled concrete aggregate (RCA) can result in a high risk of cracking under restrained conditions. However, the reduction of the modulus of elasticity of such concrete, can lead to greater stress relaxation and reduction in cracking potential. An experimental program was

get price

Freeze–Thaw Resistance and Drying Shrinkage of Recycled ...

Dec 07, 2017  To evaluate the effect of the mix proportioning method on drying shrinkage and freeze-and-thaw resistance of recycled concrete aggregate (RCA) concrete, two series of concrete mixes were made using the modified equivalent mortar volume (EMV) method and the conventional ACI method. In this study, different sources of RCAs were manufactured from on-site plants on air bases

get price

Reducing Shrinkage Cracking of Structural Concrete Through ...

Mar 31, 2006  Aggregate 3, crushed dolomitic limestone. Fresh concrete mixtures had an air content of 6 ± 1.5% and slump of 1 to 4 inches. Sealed beam specimens were used to evaluate the autogenous shrinkage of concrete up to the age of 56 days following JSCE procedure. ASTM standard test method (C 157) was used to evaluate the drying shrinkage of concrete ...

get price

Carbonation, Shrinkage and Long-Term Studies on Recycled ...

Aug 02, 2018  In this paper, durability properties such as drying shrinkage, carbonation and long-term exposure up to one year explained in detail. Increase in compressive strength of control and recycled aggregate concrete was around 20% after a exposure period of one year whereas reduction in water absorption were 1.5 and 6%, respectively, for control and ...

get price

"Using Recycled Concrete as Aggregate in Concrete ...

The main objective of this project was to evaluate the effects of using aggregate produced from crushed concrete pavement as a replacement for natural (virgin) coarse aggregate in pavement mixtures. A total of ten different concrete mixtures containing recycled concrete aggregate (RCA) were designed to meet the requirements of Indiana Department of Transportation (INDOT) specifications.

get price

Cracking Susceptibility of Concrete Made with Recycled ...

cost of landfilling waste material rises, the need for alternative aggregates and recycling of waste material will increase. Using recycled concrete aggregates (RCA) in new concrete is one way to address both of these issues. However, there has long been a concern that RCA may negatively affect the properties of new concrete in which it is ...

get price

Using Recycled Concrete Aggregate in New Concrete Pavement ...

Aug 14, 2017  Using recycled pavement as aggregate in new concrete mixes can save money and promote environmental sustainability. New design methods published in a new research report allow engineers to create more durable mixes from recycled aggregate than in the past, reducing the need for virgin aggregate, a diminishing and expensive resource.

get price

(PDF) Strength of recycled aggregate concrete for ...

inclusion of fly ash in order to modify the ITZ. REFERENCES. Benjamin, K. 2004. ... shrinkage of recycle aggregate. A CI J, 5:648–652. ... Using recycled concrete aggregate (RCA) as a ...

get price

(PDF) Improvement of Recycled Aggregates Properties by ...

Jul 16, 2021  An assessment of microcracks in the interfacial transition zone of recycled concrete aggregates cured by CO2. The effect of carbonation on the properties of recycled concrete aggregate

get price

Effect of Recycled Aggregates Concrete Construction Magazine

Nov 03, 2010  Q: How do the properties of recycled-aggregate concrete compare to those of concrete made with natural aggregates? A: The Portland Cement Association's website (cement) has lots of good information about concrete technology. They answer this question as follows: Recycled aggregates typically have higher absorption and lower specific gravity than natural aggregate and produce concrete ...

get price

Prediction of the mechanical behavior of recycled concrete ...

Crushing fresh waste concrete that collects from ready‐mixed concrete plants to prepare aggregates for new concrete production reduces the carbon dioxide footprint. This study intends to predict the mechanical properties of recycled concrete with fresh concrete waste aggregate (FCWA), including compressive strength development over time ...

get price

Volume change and strength characteristics of normal and ...

recycled aggregates content influenced the compressive strength of concrete such that the greater the recycled aggregate content the poorer the strength. As far as shrinkage behavior was concerned, Khatib (2005) observed that the concrete prepared with waste concrete aggregate or crushed brick as fine aggregate showed more drying shrinkage

get price

(PDF) Recycled Concrete as Aggregate for Structural ...

A comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the paper. Recycled aggregate was made by crushing the

get price

The Use of Recycled Material in Concrete - UKDiss

Therefore, this would reduce the carbon footprint of quarrying virgin aggregates. Different batches of concrete with ratios of 25%, 50% and 75% recycled material will replace the virgin aggregate. The maximum and minimum quantity of recycled aggregate required for an ideal concrete mix design can then be obtained.

get price