CALL US

+86 17838360708

the effect of recycled aggregate quality on concrete

the effect of recycled aggregate quality on concrete

EFFECT OF RECYCLED CONCRETE AGGREGATE QUALITY ON ...

Jul 14, 2020  The objective of this study is to investigate the effect of recycled concrete aggregate (RCA) quality on the properties of hardened concrete properties such as compressive strength, splitting tensile strength, density, water absorption capacity and porosity accessible to water. The RCA used in this study was obtained from the crushing of waste ...

get price

Effect of recycled concrete aggregates on strength and ...

produced in a quality-controlled environment, and contains little or no deleterious materials. The repetitive construction environment for precast concrete would also allow the effects of RCA to be closely monitored and controlled. Ultimately, Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength

get price

EFFECTS OF RECYCLED AGGREGATES ON CONCRETE

Figure 1.2 Uses of Recycled Concrete Aggregate (Deal, 1997) 14 Figure 1.3 Production of Green Wall using 100% recycled aggregates 15 Figure 1.4 HDB Walkway being cast with Eco-concrete 15

get price

Effect of Recycled Coarse Aggregate Type on Concrete ...

May 13, 2014  Using multilinear correlation analysis, the influences of these aggregate characteristics and other parameters on the properties of recycled aggregate concrete were evaluated. The results showed that the performance of the concrete containing each type of RA was largely influenced by the aggregate nature and quality, in addition to attached ...

get price

The Effect of Recycled Aggregate Quality on Concrete ...

The Effect of Recycled Aggregate Quality on Concrete Properties. Abstract: Waste from construction and demolition are one of the main types of wastes produced worldwide. The aim of this study is to lessen the environmental problems produced by the dumping of waste from construction and demolition. This study presents a comparative analysis of ...

get price

Effect of recycled concrete aggregates on strength and ...

produced in a quality-controlled environment, and contains little or no deleterious materials. The repetitive construction environment for precast concrete would also allow the effects of RCA to be closely monitored and controlled. Ultimately, Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength

get price

Effect of Recycled Coarse Aggregate Type on Concrete ...

May 13, 2014  Using multilinear correlation analysis, the influences of these aggregate characteristics and other parameters on the properties of recycled aggregate concrete were evaluated. The results showed that the performance of the concrete containing each type of RA was largely influenced by the aggregate nature and quality, in addition to attached ...

get price

Effects of Recycled Aggregate on Concrete Mix and Exposure ...

Jun 25, 2019  The unit weight of the concrete ranged from 2365 to 2175 kg/m 3, depending on aggregate content (Figure 6).Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete (Figure 6).The unit weights of the 15%, 20%, and 25% mixes were reduced by 8%, 11%, and 11.5%, respectively, compared to plain concrete.

get price

Effect of the quality of parent concrete on the properties ...

Effect of the quality of parent concrete on the properties of high performance recycled aggregate concrete Shi-cong Koua,b, Chi-sun Poon. a, ⇑ a. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong

get price

Effect of Recycled Coarse Aggregate on Concrete Properties ...

The replacement of recycled aggregate on concrete will decrease the characteristic Strength. In the context of Batch 1, the characteristic Strength for 0% was 29.58 MPa, 35% Recycled Aggregate was 27.27 MPa, 50%. Recycled Aggregate was 25.27 MPa and 65% Recycled Aggregate was 23.08 MPa.

get price

Effects of environmental actions, recycled aggregate ...

Nov 01, 2020  To evaluate the effects of recycled aggregate (RA) quality on the RC durability, modeled recycled concrete (MRC) containing modeled recycled aggregate (MRA) with various thickness and coverage of old mortar, along with different degrees of

get price

The Environmental Impact of Recycled Concrete

4. Characteristics of recycled concrete aggregate The international literature provided numerous works at recycled concrete aggregate area, mainly from the beginning of 1980 (Hansen, 1992). The topics most investigated are durability and mechanical characteristics. The quality of aggregates made of recycled concrete affects directly the

get price

Quality Improvement of Recycled Aggregate Concrete

the recycled aggregate application in lower grade concrete work is observed. However, the effect of recycled aggregate on the strength and durability of concrete restricts its use in higher-grade work. This paper presents a series of tests carried out on recycled coarse aggregate (RCA) and recycled coarse aggregate concrete (RCAC) and test ...

get price

Fresh and hardened properties of self-compacting concrete ...

Jul 13, 2021  Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm–4.75 mm to prepare Self-compacting concrete (SCC). The effects

get price

JP2005263587A - Method of recycling regenerated aggregate ...

3. When the blending ratio of cement-based concrete recycled aggregate is 20% by weight, the amount of dissolved carbonate decreases and the amount of dissolved free carbonate (CO 2) increases, so even if CO 2 is fed in, hydroxide ions increase and pH does not decrease much. . If the pH drops below 10.0, the coliforms will be active without ...

get price

Evaluation of Recycled Concrete for Use as Aggregate in ...

This study evaluated the use of recycled concrete as coarse aggregate in new concrete pavements. Recycled concrete aggregate (RCA) produced from demolished pavements in three geographically-dispersed locations in Washington state were used to perform testson aggregate characte ristics, fresh concrete propertiesand hardened concrete properties.

get price

Crystals Free Full-Text Effect of Mineral Admixtures ...

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate ...

get price

Recent Progress in Materials Experimental and ...

The production of concrete using recycled aggregates, obtained from the processing of construction and demolition waste, is extensively practiced worldwide. However, the effect of simultaneous adding fine recycled aggregate and the recycled coarse aggregate on the mechanical properties of concrete is still unfamiliar. This work aims to evaluate the influence of the water/cement ratio (WC Ratio ...

get price

EFFECT OF RECYCLED AGGREGATE QUALITY ON

The effect of recycled aggregates on compressive strength was found to decrease as water-cement ratio increases; at water-cement ratio of 30, recycled aggregate concrete has only 76.2% of the strength of normal aggregate concrete, but this percentage increases to 77.5% and 83.9% for waters -cement ratio of 50 and 70, respectively.

get price

EFFECTS OF RECYCLED AGGREGATES ON CONCRETE

Figure 1.2 Uses of Recycled Concrete Aggregate (Deal, 1997) 14 Figure 1.3 Production of Green Wall using 100% recycled aggregates 15 Figure 1.4 HDB Walkway being cast with Eco-concrete 15

get price

The Effect of Recycled Concrete Aggregates and Metakaolin ...

Oct 03, 2018  Nowadays, finding appropriate solutions for reducing the environmental pollutions as a consequence of buildings is important. Using recycled concrete from demolished buildings as an aggregate in new concrete preparation can have a significant role in the sustainable development of the concrete industry; therefore, in this research work, the effect of employing different percentages (i.e.,

get price

Quality Improvement of Recycled Aggregate Concrete

the recycled aggregate application in lower grade concrete work is observed. However, the effect of recycled aggregate on the strength and durability of concrete restricts its use in higher-grade work. This paper presents a series of tests carried out on recycled coarse aggregate (RCA) and recycled coarse aggregate concrete (RCAC) and test ...

get price

Evaluation of Recycled Concrete for Use as Aggregate in ...

This study evaluated the use of recycled concrete as coarse aggregate in new concrete pavements. Recycled concrete aggregate (RCA) produced from demolished pavements in three geographically-dispersed locations in Washington state were used to perform testson aggregate characte ristics, fresh concrete propertiesand hardened concrete properties.

get price

Quality improvement of recycled aggregate concrete using ...

N2 - Recycled aggregates (RA) are obtained from construction and demolished waste, laboratory crushed concrete and concrete waste at RMC plants. The concrete made from recycled aggregate is known as recycled aggregate concrete. The use of recycled aggregate is very beneficial to the environment in civil works.

get price

The Environmental Impact of Recycled Concrete

4. Characteristics of recycled concrete aggregate The international literature provided numerous works at recycled concrete aggregate area, mainly from the beginning of 1980 (Hansen, 1992). The topics most investigated are durability and mechanical characteristics. The quality of aggregates made of recycled concrete affects directly the

get price

Effect of Quality and Replacement Rate on the Double ...

Feb 01, 2020  Recycled aggregate can be used as a substitute for natural aggregate to produce good regenerated concrete, so the text use recycled coarse aggregate and recycled fine aggregate to substitute for natural aggregate with different replacement rates preparing double recycled aggregate concrete, and researching the effect of the quality and replacement rate of recycled aggregate on

get price

Influence of Quality and Replacement Rate of Recycled ...

Compared with natural aggregate, the content of hardening cement in recycled aggregate is larger, which leads that the water absorption of recycled aggregate is larger and its performance such as robustness is poorer. And the engineering field pays much attention to the problem of the recycled fine aggregate which can be used in the durability requirements of recycled concrete or not.

get price

Treatment Methods for the Quality Improvement of Recycled ...

Jan 24, 2021  Ryu J S. An Experimental Study on the Effect of Recycled Aggregate on Concrete Properties[J]. Mag. Concr. Res., 2002, 54(1): 7–12. CAS Article Google Scholar [19] Xiao J Z, Li W G, Sun Z H, et al. Properties of Interfacial Transition Zones in Recycled Aggregate Concrete Tested by Nanoindentation[J]. Cem. Concr.

get price

Effect of Phase Change Materials (PCM’s) on Recycled ...

Jul 22, 2020  Corominas A G and Etxeberria M (2016). Effects of using recycled concrete aggregates on the shrinkage of high performance concrete. Construction and Building Materials, 115:32-41. Dhir R K, Limbachiya M C and Leelawat T (1999). Suitability of recycled concrete aggregate for use in BS 5328 designated mixes.

get price

Environmental Considerations in Concrete Recycling

Mar 29, 2017  Concrete Recycling • Breaking, removing and crushing hardened concrete from an acceptable source. • Old concrete pavements often are excellent sources of material for producing recycled concrete aggregate (RCA). • This webinar focuses primarily on RCA from existing pavements (not mixed CD waste). 6

get price

JP2005263587A - Method of recycling regenerated aggregate ...

3. When the blending ratio of cement-based concrete recycled aggregate is 20% by weight, the amount of dissolved carbonate decreases and the amount of dissolved free carbonate (CO 2) increases, so even if CO 2 is fed in, hydroxide ions increase and pH does not decrease much. . If the pH drops below 10.0, the coliforms will be active without ...

get price

Mechanical Properties Of Recycled Aggregates Concrete ...

Aggregates content is a factor which has direct far reaching effects on the both quality cost of concrete unlike water and cement, which do not alter any particular characteristics except in the quantity in which they are used, the aggregate component is infinity variable in terms of shape grading With fine aggregates, graded below ...

get price