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improving the mechanical properties of recycled concrete

improving the mechanical properties of recycled concrete

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Jun 01, 2017  This paper presents the results of a study that investigated the improvement of the mechanical properties of recycled concrete aggregate (RCA) produced by adding chopped basalt fibers (BF) with contents of 0.1%, 0.3%, 0.5%, 1%, and 1.5% by total volume of the mix to treated and untreated recycled aggregates.

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Nov 01, 2019  Improving the mechanical properties of recycled concrete aggregate using chopped basalt fibers and acid treatment Constr. Build. Mater. , 140 ( 2017 ) , pp. 328 - 335

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Jun 01, 2018  It has been suggested that, although the mechanical properties of recycled aggregate concrete are generally inferior to those of conventional concrete, there is a great potential to incorporate RCA and/or RBA in structural concrete applications , , , . Compared to the RCA, the research on RBA has more challenges due to the variety of types of ...

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Jan 15, 2018  The main difference between Recycled Concrete Aggregate (RCA) and Natural Aggregate (NA) is the mortar adhered on RCA. This paper presents the effect of RCA to concrete and a treatment method utilized to improve the properties of RCA, by reducing the amount of the adhered mortar, and therefore the properties of the Recycled Aggregate Concrete (RAC).

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May 10, 2020  Recycled concrete aggregate (RCA) differ from natural aggregate as the former contains attached mortar. Given the recycling process of RCA, that is, by crushing, the microstructure presents several disadvantages, such as porosity, micro-cracks, as well as weak interface transition zones (ITZs), which will also damage the mechanical properties and durability of recycled aggregate concrete

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Sep 29, 2020  concrete can match up to the properties of concrete with gravel or crushed rock—which is usually the parent concrete for the CCA. The quality improvements in coarse CCA fractions by mechanical pre-processing are shown to produce concrete with similar compressive strength as concrete containing aggregates of crushed stone or gravel [2].

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Mechanical Properties of Concrete Using Recycled Plastic

Concrete is the most widely used construction material in the world. There is a concern to more understanding and to improve its properties. 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.

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New formulations for mechanical properties of recycled aggregate ... an alternative to non-renewable natural aggregate in concrete has been considered to improve resource sustainability in the con-

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AREVIEW ON STUDIES OF THE MECHANICAL PROPERTIES OF

fiber and Metakaolin on mechanical, and durability properties of self- compacting concrete and the results was GF increase spelt strength, no effect on compressive strength, improve chloride resistance, decrease workability ,MK improve strength and durability of SCC The optimum cement replacement ratio was 0.8 % in GF reinforced SCC

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Using recycled coarse aggregate (RCA) to replace natural pebbles and using lithium slag (LS) from industrial waste to replace cement in order to improve the mechanical properties of concrete and solve environmental problems. In this study, the effects of different substitution rates of RCA (0, 30%, 50%, and 70%) and different LS contents (0, 10#x0025;, 15#x0025;, 20#x0025;, and 25#x0025 ...

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Mechanical and Damping Properties of Recycled Aggregate ...

In this study, recycled aggregate concrete (RAC) modified with polypropylene fiber (PP) and air-entraining agent (AGA) was prepared, and the effects of PP and AGA on the static (compressive strength, Young's modulus, and splitting tensile strength) and dynamic properties (dynamic modulus of elasticity and damping ratio) of RAC were investigated.

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Mechanical Properties of Concrete Using Recycled Plastic

Concrete is the most widely used construction material in the world. There is a concern to more understanding and to improve its properties. 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.

get price

Mechanical Properties Of Recycled Aggregates Concrete ...

The application of recycled aggregate to use in construction activities have been practice by developed European countries and also of some Asian countries. 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).

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Mechanical properties of recycled concrete with demolished ...

In order to improve the performance of the recycled aggregates in the concrete mixes, the RCA and RBA were carefully sieved by using the optimal degradation. In this way the largest reduction in the 28-day compressive strength was found to be only 7.2% and 9.6% for C25 and C50 recycled concrete when the NCA was replaced 100% by RCA, and 11% and ...

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Mechanical Properties Test and Strength Prediction on ...

Mar 17, 2021  In order to study the mechanical properties of basalt fiber reinforced recycled concrete (BFRRC), nine groups of tests are designed with three different replacement rates of recycled aggregates (40%, 70%, and 100%) and volume fraction of basalt fibers (0.1%, 0.2%, and 0.3%). Another group of tests on ordinary concrete without fiber and recycled aggregate is used as comparison.

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The Design and Development of Recycled Concretes in a ...

Aug 23, 2021  This research study analysed the effect of adding fine—fMRA (0.25% and 50%)—and coarse—cMRA (0%, 25% and 50%)—mixed recycled aggregate both individually and simultaneously in the development of sustainable recycled concretes that require a lower consumption of natural resources. For this purpose, we first conducted a physical and mechanical characterisation of the new recycled

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Impact Properties of Recycled Aggregate Concrete with ...

Sep 02, 2020  The optimal soaking time and nanosilica concentration were chosen by the physical properties of the nanosilica-modified recycled aggregate. Recycled aggregate concrete (RAC) and nanosilica recycled aggregate concrete (SRAC) were fabricated by using ordinary recycled aggregate and nanosilica-modified recycled aggregate. Based on the comparative experimental study of basic mechanical properties ...

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Strengthening Effect of Graphene Oxide on Mechanical ...

The micro-mechanical properties and micro-structural characteristics of the interfacial transition zones of recycled concrete with graphene oxide were studied by using nanoindentor. The results showed that the average elastic modulus and width of the interfacial transition zone of recycled concrete with graphene oxide between new paste matrix and natural aggregate were about 20GPa and 30-35μm ...

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(PDF) Promoting the physical and the mechanical properties ...

mechanical properties of concrete Scientific Research and Essays 2 372 – 9 [9] El -Haggar S M 2007 Sustainable Industrial Design and W aste Management [1 0] Shah S P, Hou P and Konsta-Gdoutos M ...

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Strength and Durability Evaluation of Recycled Aggregate ...

May 14, 2015  This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. 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.

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The Effect of Recycled Concrete Aggregates and Metakaolin ...

Oct 03, 2018  In general, the mechanical properties of self-compacting concrete containing 2 wt% of SiO 2 nanoparticles with the addition of metakaolin as an additive of cement up to 20 wt% improve the mechanical properties of concrete, and by increasing the substitution percentage of recycled aggregates, the mechanical properties are reduced.

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Critical Review of Recycled Aggregate Concrete Properties ...

Nov 11, 2020  Although the properties of recycled aggregate concrete are widely considered to be inferior to those of natural aggregate concrete, research in the field still is of merit due to growing awareness of environmental concerns relating to the concrete construction and demolition industry.

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Effectiveness of Fiber Reinforcement on the Mechanical ...

This paper presents an experimental study conducted to investigate the effect of fiber reinforcement on the mechanical properties and shrinkage cracking of recycled fine aggregate concrete (RFAC) with two types of fiber—polyvinyl alcohol (PVA) and nylon. A small fiber volume fraction, such as 0.05% or 0.1%, in RFAC with polyvinyl alcohol or nylon fibers was used for optimum efficiency in ...

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Physical and mechanical properties of concrete

Aug 07, 2014  Therefore, improving concrete properties and reducing the size and amount of defects in concrete would lead to better concrete performance. An effective way of improving these properties is by adding a small fraction (usually 0.5% - 2% by volume) of short fibers to the concrete

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Improved Mechanical Properties and Early-Age Shrinkage ...

Jul 07, 2013  To overcome some inferior physical and mechanical properties of recycled aggregate concrete (RAC), an enhancing technique is presented in this paper to improve the performance of RAC by adding a promising chemical admixture, an atomic polymer technology (APT) in the form of a mesoporous inorganic polymer (MIP).

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Mechanical Properties of Concrete Using Recycled Plastic

Concrete is the most widely used construction material in the world. There is a concern to more understanding and to improve its properties. 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.

get price

Effectiveness of Fiber Reinforcement on the Mechanical ...

This paper presents an experimental study conducted to investigate the effect of fiber reinforcement on the mechanical properties and shrinkage cracking of recycled fine aggregate concrete (RFAC) with two types of fiber-polyvinyl alcohol (PVA) and nylon. A small fiber volume fraction, such as 0.05%

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Mechanical properties of recycled concrete with demolished ...

In order to improve the performance of the recycled aggregates in the concrete mixes, the RCA and RBA were carefully sieved by using the optimal degradation. In this way the largest reduction in the 28-day compressive strength was found to be only 7.2% and 9.6% for C25 and C50 recycled concrete when the NCA was replaced 100% by RCA, and 11% and ...

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Mechanical properties of recycled concrete with demolished ...

This paper presents an experimental investigation on the effect of the replacement of natural coarse aggregate (NCA) with either recycled concrete aggregate (RCA) or recycled clay brick aggregate (RBA) on the compressive strengths of the hardened concrete. Two grades (C25 and C50) of concrete were investigated, which were achieved by using different water-to-cement ratios.

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Effectiveness of Fiber Reinforcement on the Mechanical ...

This paper presents an experimental study conducted to investigate the effect of fiber reinforcement on the mechanical properties and shrinkage cracking of recycled fine aggregate concrete (RFAC) with two types of fiber—polyvinyl alcohol (PVA) and nylon. A small fiber volume fraction, such as 0.05% or 0.1%, in RFAC with polyvinyl alcohol or nylon fibers was used for optimum efficiency in ...

get price

Critical Review of Recycled Aggregate Concrete Properties ...

Nov 11, 2020  Although the properties of recycled aggregate concrete are widely considered to be inferior to those of natural aggregate concrete, research in the field still is of merit due to growing awareness of environmental concerns relating to the concrete construction and demolition industry.

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Mechanical Properties and ITZ Microstructure of Recycled ...

Jun 18, 2018  The effect of carbonation treatment and mixing method on the mechanical properties and interfacial transition zone (ITZ) properties of recycled aggregate concrete (RAC) was investigated. Properties of recycled concrete aggregate (RCA) were tested firstly. Then, five types of concretes were made and slump of fresh concrete was measured immediately after mixing. Compressive strength

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(PDF) Promoting the physical and the mechanical properties ...

mechanical properties of concrete Scientific Research and Essays 2 372 – 9 [9] El -Haggar S M 2007 Sustainable Industrial Design and W aste Management [1 0] Shah S P, Hou P and Konsta-Gdoutos M ...

get price

The Design and Development of Recycled Concretes in a ...

Aug 23, 2021  This research study analysed the effect of adding fine—fMRA (0.25% and 50%)—and coarse—cMRA (0%, 25% and 50%)—mixed recycled aggregate both individually and simultaneously in the development of sustainable recycled concretes that require a lower consumption of natural resources. For this purpose, we first conducted a physical and mechanical characterisation of the new recycled

get price

Improving the Durability Properties of Self-Consolidating ...

Feb 17, 2021  Th previous studies reveal that the Fine Recycled Concrete Aggregates (FRCA) has a more adverse effect on durable properties of concrete than Coarse Recycled Concrete Aggregates (CRCA). Fan et al. [ 16 ] concluded that substitution of FRCA plays an important factor in mechanical and durable properties of the resulting concrete.

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Effect of Graphene Oxide on Mechanical Properties and ...

properties of cement-based materials. Thus far, the use of GO to improve the properties of UHPC prepared from recycled sand has not been investigated. Furthermore, most of the previous research focused on the e ects of GO on the mechanical properties of concrete made from recycled sand.

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Mechanical and Durability Properties of Induction-Furnace ...

Nov 26, 2018  Jin et al. investigated concrete produced from recycled redbrick and demolished concrete and suggested “prewetting” method to improve the mechanical properties of recycled aggregate concrete. The poor performance of the RAC is associated with the cracks and fissures, which are formed in RA during processing, thereby rendering the aggregate ...

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Mechanical Properties of Recycled Tire Wires and Glass ...

Apr 14, 2020  Concrete is a versatile construction material with various uses. It is has poor tensile strength and good compressive strength mechanical properties. In past, an effort has been made to improve concrete mechanical properties by mixing with various foreign materials such as synthetic and natural fibers, steel wires and plastics. However, there is research gap in literature to study

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