Influence of double hooked-end steel fibers and slag on mechanical and durability properties of high performance recycled aggregate concrete

Afroughsabet, Vahid; Biolzi, Luigi; Ozbakkaloglu, Togay

doi:10.1016/j.compstruct.2017.08.086

Cited by 230 publications

(118 citation statements)

References 76 publications

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“…e strength properties of the recycled concrete were lower than that of the control concrete and decrease as the water to cement ratio increases, as shown in Figure 7. e dispersion of compressive performance of the recycled concrete with the water to cement ratio of 0.53 was more than that with the water to cement ratio of 0.47. is conclusion was in agreement with the experimental results in many literatures [25].…”

Section: Mixture Proportion and Experiments Specimen As Shown Insupporting

confidence: 82%

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

2018

Advances in Materials Science and Engineering

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e study on preparation technology of recycled concrete with economical and technical feasibility has gained more serious attention in each country due to its involvement and effect on the environment protection and the sustainable development of human society. In this study, we conducted a control variable test to investigate and assess the influence of the aggregate size on the strength characteristics of concrete with different diameters of recycled aggregates. Concrete with recycled aggregates of 5∼15 mm (A), 15∼20 mm (B), 20∼30 mm (C), and their combinations were subjected to a series of unconfined pressure tests after curing for 28 days. Based on the results obtained from the tests, an effort was made to study the relationship between the mechanical characteristics of recycled aggregate concrete and aggregate particle size. Also, a regression model of recycled concrete was proposed to predict the elasticity modulus and to adjust the design of mixture proportion. It is believed that these experiment results would contribute to adjust the remediation mixture for recycling plants by considering the influence of recycled aggregate size.

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Section: Mixture Proportion and Experiments Specimen As Shown Insupporting

confidence: 82%

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

2018

Advances in Materials Science and Engineering

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“…Polyolefin shrinkage at initial hours is measured after casting that is preventable by optimization of the mix design and suitable curing. Interactions between hardened cement paste and carbon dioxide lead to carbonation shrinkage [20,21]. Volume reduction due to this phenomenon occurs slowly in the surrounding area, such that it is inappreciable compared to drying shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Restrained Shrinkage Cracking of Fiber-Reinforced High-Strength Concrete

Saradar

Tahmouresi

Mohseni

et al. 2018

Fibers

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Concrete shrinkage and volume reduction happens due to the loss of moisture, which eventually results in cracks and more concrete deformation. In this study, the effect of polypropylene (PP), steel, glass, basalt, and polyolefin fibers on compressive and flexural strength, drying shrinkage, and cracking potential, using the ring test at early ages of high-strength concrete mixtures, was investigated. The restrained shrinkage test was performed on concrete ring specimens according to the ASTM C1581 standard. The crack width and age of restrained shrinkage cracking were the main parameters studied in this research. The results indicated that the addition of fiber increases the compressive strength by 16%, 20%, and 3% at the age of 3, 7, and 28 days, respectively, and increases the flexural toughness index up to 7.7 times. Steel and glass fibers had a better performance in flexural strength, but relatively poor action in the velocity reduction and cracking time of the restrained shrinkage. Additionally, cracks in all concrete ring specimens except for the polypropylene-containing mixture, was developed to a full depth crack. The mixture with polypropylene fiber indicated a reduction in crack width up to 62% and an increasing age cracking up to 84%.

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“…e relevant parameters of the calculation are as follows ( Table 7). rough calculation and comparison of the results, it can be seen that the amount of refrigerant required for not providing the heat insulation layer is larger than that of the setting, and the amount of refrigerant required for styrene as the heat insulation layer is larger than that of the polyurethane [83][84][85][86][87][88][89]. In addition, the phase transition point of liquid nitrogen is lower than that of ice, and the cooling effect as a refrigerant is better than that of ice, but the production cost of liquid nitrogen is higher than that of ice (Tables 8 and 9) [90-103].…”

Section: Other Methodsmentioning

confidence: 99%

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Duan

Zhang

Lai

2019

Advances in Materials Science and Engineering

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Long and deep tunnels are increasingly designed and built worldwide, often in severe geothermal environments characterized by high temperature in the rocks. is issue cannot be ignored because high temperature definitely affects the strength of the adhesion between the concrete and the surrounding rocks, whatever the lining cast in place, segmental or sprayed using shotcrete. e causes of geothermal heat and the effect of the temperature on tunnel linings during and after their construction are recalled and discussed in this paper. Both temperature and humidity are shown to be the most relevant factors affecting adhesion strength, whose loss is related to the microdamage in the shotcrete layers closest to the rock. Possible ways to improve adhesion strength and to minimize the high-temperature detrimental effect are also presented and discussed.

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Influence of double hooked-end steel fibers and slag on mechanical and durability properties of high performance recycled aggregate concrete

Cited by 230 publications

References 76 publications

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

Restrained Shrinkage Cracking of Fiber-Reinforced High-Strength Concrete

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

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