Experimental assessment of mechanical and physical performance of latex modified concrete with fine recycled aggregate

Al-Luhybi, Ashtar S.; Aziz, Islam Abdullah; Mohammad, Khalaf I.

doi:10.1016/j.istruc.2023.01.069

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…However, RFA and RCA are produced in almost equal proportions during the recycling process, i.e., about 50% of the volume of crushed material is the fraction having a maximum particle size of 4 mm [27]. However, recently there is an increased focus of research on the incorporation of RFA in concrete [25,[29][30][31][32][33][34], and fewer studies have investigated the RAC with 100% recycled aggregates (both RFA and RCA) [26,35]. Therefore, there is a need to investigate ways to efficiently incorporate the fine fraction of the recycled concrete in the design of sustainable concrete.…”

Section: Introductionmentioning

confidence: 99%

Impact of Compression Casting Technique on the Mechanical Properties of 100% Recycled Aggregate Concrete

et al. 2023

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The research work presented in this manuscript focused on the comparative examination of the influence of the Compression Casting Technique (CCT) and the conventional casting method (i.e., compaction through vibration) on the performance of 100% Recycled Aggregate Concrete (RAC). The minimum target compressive strength of 100% RAC was 15 MPa keeping in view its application in the manufacturing of load-bearing concrete masonry units. A total of 28 concrete compositions were prepared by varying the coarse to fine aggregates ratio (i.e., 70:30 and 60:40), cement content (10% and 15%) by weight of total aggregates, casting technique, and applied pressure for compression casting (i.e., 25, 35, and 45 MPa). The concrete compositions were tested to determine their density, compressive strength, Elastic Modulus (EM), and Ultrasonic Pulse Velocity (UPV). For comparison, samples of Natural Aggregate Concrete (NAC) were also tested for the same properties. The results highlighted the positive impact of CCT on the properties of 100% RAC. The compressive strength and EM of fully RAC was increased by 20–80% and 15–50%, respectively, by changing casting method from vibration to CCT. At casting pressure of 35 MPa and 15% cement, compressed 100% RAC exhibited compressive strength higher than vibrated NAC. The UPV value exhibited by 100% RAC was increased by changing the casting technique. The analytical models were proposed using regression analysis of experimental results to predict compressive strength and EM of compressed 100% RAC and NAC. These proposed models were evaluated using statistical parameters, i.e., average absolute error (AAE) and mean (M) and found to be able to predict the compressive strength and EM of RAC with reasonable accuracy as compared to the analytical models already existing in the literature. This study finally concluded that through CCT, 100% RAC with low cement content could achieve minimum target compressive strength of 15 MPa. The development and use of compressed load-bearing 100% RAC construction units would help to achieve sustainability in construction.

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Section: Introductionmentioning

confidence: 99%

Impact of Compression Casting Technique on the Mechanical Properties of 100% Recycled Aggregate Concrete

et al. 2023

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“…However, it is difficult to ensure the homogeneity of the recycled aggregates. Compared with using natural aggregates, concrete using recycled aggregates may lead to defects including low workability, low strength and other durability problems [ 53 , 54 , 55 ]. Because of the low performance of recycled concrete aggregates, it is commonly believed that the replacement ratio of recycled concrete aggregates cannot be higher than 30% for the total mass of aggregates [ 56 , 57 , 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Huo

Huang²,

Han

et al. 2023

Materials

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This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For the aggregates, both natural and recycled aggregates were used. Three specimens with dimensions of 800 mm × 800 mm × 800 mm were prepared to simulate mass concrete. The workability, temperature aging and strength of the mass concrete were tested. The test results showed that utilizing HVGGBFS concrete as mass concrete can significantly reduce the heat of hydration due to the low heat of hydration of GGBFS, while the heat of hydration of GGBFS and recycled aggregate combination is 11.2% higher than normal concrete, with a slump that is 31.3% lower than that of plain concrete. The results also showed that the use of recycled aggregates in HVGGBFS concrete can significantly reduce workability. However, the compressive strength is higher than when natural aggregates are used due to the alkali activation effect caused by the recycled aggregates. The compressive strength at 7 and 28 days increased by 33.7% and 16.3%, respectively.

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New insights into the effect of residual paste content on the properties of recycled fine aggregate mortar and concrete

Chen,

Zhan,

Hong

et al. 2024

Construction and Building Materials

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Experimental assessment of mechanical and physical performance of latex modified concrete with fine recycled aggregate

Cited by 6 publications

References 18 publications

Impact of Compression Casting Technique on the Mechanical Properties of 100% Recycled Aggregate Concrete

Impact of Compression Casting Technique on the Mechanical Properties of 100% Recycled Aggregate Concrete

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

New insights into the effect of residual paste content on the properties of recycled fine aggregate mortar and concrete

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