Concrete mixes with a design compressive strength of 30mpa are made using recycled aggregates. Mechanical properties of concrete incorporating recycled aggregate and glass aggregate prof. The effects of light aggregates of recycled pet in reinforced concrete were analyzed by compression, tension resistance, elasticity module, and density. And the microstructure of recycled concrete aggregate rca was revealed to find the seawater corrosion by using scanning electron microscope sem. When recycled aggregate was washed, these negative effects were greatly improved 10. Aggregates are inert fillers floating in the cement paste matrix for concretes of low strength. Mechanical properties of recycled aggregate are primarily dependent on the quality of the original cement mortar present in the aggregate, and also, as in the case.
Consequently, concrete produced with crushed concrete aggregate tend to be harsh and unworkable. Mechanical properties of concrete with admixed recycled aggregate. Jun 20, 2006 in this paper, a detailed investigation is conducted to analyze the relationships between the mechanical properties of recycled aggregate concrete rac. Minimizing the environmental impact and energy and co2 intensity of concrete used for construction is increasingly important as resources decline and the impact of greenhouse emissions becomes more evident.
The use of fine recycled concrete aggregates up to 30% replacement ratio would not affect the mechanical properties of concrete. Mechanical properties of recycled aggregate concrete under. An experimental investigation on the strength characteristics of concrete made with recycled coarse aggregate is presented and discussed in this paper. The effects of different types of coarse aggregates on mechanical properties of concrete were compared in this paper. The primary objective of this study was to characterize the concrete rebar bonding properties of the recycled aggregate concrete. Enhancing mechanical and durability properties of recycled. It is evident that the reduction of compressive strength of racs. This method removed 70 to 80% of attached mortar of the rca. Mechanical properties and structural performance of recycled.
In this paper the relationships between the mechanical and fracture properties of recycled aggregate concretes rac are investigated based on the own research programs results and an extensive number of experimental data from the literature. The mechanical properties of recycled aggregate concrete. Pdf durability of recycled aggregate concrete miquel. Mechanical properties and structural performance of. Seven rcamade experimental mixtures, as well as two mixtures made with virgin aggregates were used in this study. The quality of recycled aggregate is greatly affected by cement mortar attached to the surface of aggregate. Pdf mechanical properties of recycled aggregate concrete.
This paper reports the results of an experimental study on some of the mechanical properties of recycled aggregate concrete rac as compared to those of the conventional normal aggregate concrete nac. Effects of using recycled concrete as aggregate on. In addition, the mechanical properties of the concrete that was made by the recycled aggregate were compared to the concrete made of natural aggregate. In this paper, experimental results for the mechanical properties of recycled aggregate concrete under uniaxial compression loading are presented and discussed. Mechanical properties of recycled aggregates concrete. Enhancing mechanical and durability properties of recycled aggregate concrete george dimitriou, pericles savva. Experimental research on mechanical properties of recycled. Adding portion of natural sand would tackle this problem. Finally, the crushing procedure and the dimension of the recycled aggregate have an influence on the amount of adhered mortar. Moreover, adding sf as a supplementary binder material can also improve the mechanical and physical properties of concrete prepared with recycled concrete aggregate 4,1922. This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications.
Effects of coral, recycled and natural coarse aggregates. Using recycled concrete aggregate rca in concrete has been the subject of many studies for years. The strength of aggregates do not contribute to the strength of concrete for low strength concrete. Based on a large number of experimental results published worldwide in literature from 1985 to 2004, an experimental database is developed with regard to the main mechanical properties of rac. The residual compressive strengths of above recycled aggregate concretes after exposure to elevated temperatures are also evaluated and compared to those. In this research, the recycled concrete aggregates, as one of the main constituents of construction and demolition wastes, were used to produce bioblocks by the biomineralization of caco 3 and the results were compared to bioblocks produced with natural aggregates. Influence of service time of recycled coarse aggregate on. An investigation of mechanical properties of recycled coarse. This paper deals with the mechanical properties of concrete. In this paper, the effects of various percentages 0%, 25%, 50%, 75%, 100% of recycled aggregate ra on compressive strength of recycled aggregate concrete rac were investigated. This research presents an experimental investigation on the engineering properties of concrete prepared with crushed tiles as recycled coarse aggregates. On relationships between the mechanical properties of. A total of 324 specimens have been completed for this investigation.
Microstructure and mechanical properties of recycled. Use of recycled coarse aggregate rca in concrete can be described in terms of environmental protection and economy. Most studies on mechanical properties of concrete with recycled aggregate was focused on the concrete with compressive strength of less than 40 mpa. Basic properties of concrete with recycled concrete aggregate based on available experimental evidence, the most important properties of recycled concrete aggregate rca and concrete made with recycled aggregate rac are briefly presented in this chapter. Mixes with 10%, 30%, 50% and 100% by volume replacement of fine natural aggregates fna with fra were produced and tested for water. Introduction it is well known that the incorporation of low volume fractions 0. Thus, this paper evaluates the effects on the mechanical properties of hardened concrete containing.
Concrete mixtures were prepared by using 50% and 100% rca and. These models cannot describe the difference in the. This paper presents the experimental results of the use of. Mechanical and durability properties of recycled aggregate concrete rac made with different replacement levels of recycled coarse aggregate rca. Mechanical properties of recycled aggregate concrete at low. The recycled aggregates consist of original natural aggregate and adhered mortar. The test showed that the workability of recycled aggregate is lower than the workability of natural aggregate.
Mechanical and durability properties of recycled aggregate. Keywords crushed brick, mechanical properties recycled aggregates, i. This paper presents the effect of recycled coarse aggregate rca of 50% and 100% by wt. However, recycled concrete aggregates may adversely impact the mechanical properties of recycled aggregate concrete. Arum 6 found that the workability of virgin aggregate concrete is better than that of recycled aggregate concrete at the same watercement wc ratio. These authorized application remain quite low risk indoor, no frost. Crushed concrete aggregates properties and uses of recycled. Mechanical properties of concrete with recycled coarse aggregate. The application of recycled aggregate to use in construction activities have been practice by developed european countries and also of some asian countries. Compressive strength is the basic mechanical properties and one of the indicators to determine the performance of a concrete. This trend is necessitated by the high diminishing rate of construction materials, pressing demand on existing. Concret e is the premier civil engineering construction material. Mechanical properties of steel fiber reinforced recycled.
Paper reports the basic properties of recycled fine aggregate and recycled coarse aggregate. Mechanical properties of recycled aggregate concrete produced with portland pozzolana cement article pdf available march 2016 with 2,855 reads how we measure reads. Through a series of experiments, used construction rubbish as recycled aggregate, the compressive strength and elastic modulus of recycled concrete specifi. Mechanical properties of recycled aggregate concrete adel a. Some mechanical properties of normal and recycled aggregate. Furthermore, the durability and mechanical properties of both types of bio. Concrete is the most widely used construction material in the world. Aggregates aggregates generally occupy 65 80% of a concrete s volume.
Mechanical properties of concrete with recycled coarse. Mechanical properties of concrete incorporating recycled. However, the decrease in the strength with the increase of the brick ships replacement was up to 20 present of the control mix. Using waste and recycled materials in concrete mixes becoming increasingly important to manage and treat both the solid waste generated by industry and municipal waste. Petrou a department of civil and environmental engineering, university of cyprus, 75 kallipoleos av.
Pdf mechanical properties of concrete with recycled. The mechanical properties of asphalt mixtures with recycled concrete aggregates article pdf available in construction and building materials 243. Mechanical properties of recycled aggregate concrete produced with portland pozzolana cement table 3 properties of fine aggregates characteristics type specific gravity fineness modulus grading zone value sand 2. Recycled concrete as aggregate for structural concrete production. From this investigation, the following conclusions can be drawn. Effect of recycled aggregates on mechanical properties of. Recycled concrete aggregate rca for infrastructure. Effect of recycled aggregates on mechanical properties of concrete. The results obtained were compared with crushed aggregate concrete cac using the normal compressive testing. The smaller strength and ductility of recycled aggregate concrete. Mechanical properties of concrete containing recycled coarse. A lot of research has already been done on the mechanical properties of recycled aggregate concrete. High water absorption affects water cement ratio 4 and 17, workability of concrete mix and physical properties such as water absorption and carbonation 7.
This attached mortar results in higher porosity and higher water absorption rates, which reduce the strength and mechanical performance of concrete made from such recycled aggregate. Mechanical properties of recycled concrete with demolished. The basic properties of recycled aggregate concrete rac including the compressive strength, the elastic modulus, and chloride penetration depth were explicitly investigated. By replacement of recycled aggregate as fine aggregate we can reduce the consumption of natural and environmental resources. Dhinakaran school of civil engineering, sastra university, thanjavur 6401, india email. The effect of fine and coarse recycled aggregates on fresh. Mechanical properties of concrete containing recycled. Basic mechanical properties of basalt fiber reinforced. Current models primarily relate rac elastic modulus to its compressive strength. Mechanical and fracture properties of recycled aggregate. Mechanical properties of recycled aggregate concrete produced. Mechanical properties of recycled aggregate concrete article pdf available in journal of engineering and applied sciences 1119 october 2016 with 1,977 reads how we measure reads. By conducting a series of laboratory experiments, the crushing and sieving procedure of wasted concrete to produce rca were studied, the racs with different strengths were. Mechanical properties of recycled aggregate concrete.
Many structures that were constructed in india during the construction boom of the 1970s are now required of either major repairs or possible replacement. Sf on mechanical properties of concrete is evaluated in fourth, fifth and sixth series, respectively. The application of recycled aggregate has been started in many construction projects in many european, american and asian countries. Effects on mechanical properties of recycled pet in cement. Mechanical and durability properties of concrete produced. Rheological and mechanical properties of ultrahigh. The mechanical properties of concrete prepared with. In order to study the basic mechanical properties of basalt fiber reinforced recycled aggregate concrete, the concrete mix ratio, the length and the volume mixing ratio of chopped basalt fiber yarn are designed for changing factors. The results indicate that mechanical properties of concrete increases with increase in recycled. In this paper, the permeability properties of fine recycled aggregate concrete are presented. Study on mechanical properties of recycled aggregate concreteibehaviour under uniaxial compression, journal of building materials, 105, 598604, 2007. Test were performed for mechanical properties concrete using recycled aggregate using variation of nano silica. Mechanical properties of recycled aggregate concrete produced with portland pozzolana cement suman saha and rajasekaran ca department of civil engineering, national institute of technology karnataka, surathkal, mangalore575025, india received april 18, 2016, revised june 15, 2016, accepted june 23, 2016 abstract. Mechanical properties of recycled pet fibers in concrete and fiberreinforced concrete mixtures were manufactured in a conventional rotary drum mixer.
Review article assessment of recycled aggregate concrete. In this paper, a detailed investigation is conducted to analyze the relationships between the mechanical properties of recycled aggregate concrete rac. Although concrete production is one of the highgrade applications where recycled aggregate can be used, concrete strength decreases when recycled aggregates were used and the strength reduction could be as low as 40%. Physical and mechanical properties of rac were investigated including density, compressive and flexural strength. Strength and durability evaluation of recycled aggregate. Pdf the mechanical properties of asphalt mixtures with. Study of the mechanical performance of a recycled aggregate.
The rac at a certain low or high wb ratio was prepared with rca made. The present project investigates the properties of sustainable concrete materials made with recycled concrete aggregate rca as a partial replacement of coarse aggregate. Mechanical properties of recycled aggregate concrete containing. Ravindra patil 1, payal hon 2, mrunmayee sawai 3, mamta sonawane 4, shweta khaire 5 1,2,3,4,5 civil engineering, sandip rxqgdwlrqv6,0, nashik abstract.
Influence of silica fume on mechanical and physical. The fra used come from demolished concrete of known properties. The smaller strength and ductility of recycled aggregate concrete rac, compared to those of natural aggregate concrete nac, have restricted its use to mainly non. Mechanical properties of recycled pet fibers in concrete. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete. Study on mechanical properties of recycled aggregate concrete ibehaviour under uniaxial compression, journal of building materials, 105, 598604, 2007.
Concrete mixes with a design compressive strength of 30mpa are made using recycled aggregates with percentages ranging from 0 to 100% of. The mechanical properties of recycled aggregate concrete rac may be affected by the service time of parent concrete used to produce the recycled coarse aggregate rca, which has not been experimentally investigated. This study experimentally investigates the mechanical properties of steel fiber reinforced recycled aggregate concrete sfrrac. The use of recycled concrete aggregates as an alternative aggregate material in concrete has been studied over the past two decades. Many countries are giving many infrastructural laws relaxation for increase the use of recycled aggregate. Aggregates aggregates generally occupy 65 80% of a concretes volume. The experimental investigation of the preparation process of recycled aggregate concrete rac using the waste concrete as recycled aggregate concrete rca was reported. Strength and durability evaluation of recycled aggregate concrete. This paper reports the results of an experimental study on the mechanical properties of recycled aggregate concrete rac as compared to natural aggregate concrete nac. Also due to new construction for better economic growth, tructures are s. Mechanical properties and durability of bioblocks with. Ten mixes of concrete with target compressive cube strength ranging from 20 to 50 mpa were cast using normal or recycled coarse aggregates. There is a concern to more understanding and to improve its properties. This led to some changes in the standard for various applications.
Mechanical behavior of three generations of 100% repeated recycled coarse aggregate concrete. Effects of using recycled concrete as aggregate on physical. The characteristics of aggregates impact performance of fresh and hardened. It is now recognized that the recycled aggregate concrete rac, where natural aggregates are replaced with recycled concrete aggregates, is a promising technology for conserving natural resources and reducing the environmental impact of concrete. Nov 15, 2018 this study experimentally investigates the mechanical properties of steel fiber reinforced recycled aggregate concrete sfrrac. The need for sustainable asphalt highway design and construction is becoming a priority within the asphalt transportation industry. An investigation of mechanical properties of recycled. A type of thermal treatment was employed to remove mortar attached to rca. Concrete volume contains from 6580% aggregate and it plays a substantial role in concrete properties such as workability, strength, dimensional stability, and durability, so the use of waste materials in concrete as aggregates can effect in the amount of waste materials deeply. Compressive strength, indirect tensile strength and modulus of.
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