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Shear Stresses of Hollow Lightweight Concrete Beams Made with Wood Waste

Salam Salman Chiad Alharishawi Nagham Rajaa Lina Abdulsalam Shihab

Archives of Civil Engineering | 2021 | vol. 67 | No 1 | 657-672 | DOI: 10.24425/ace.2021.136495

Keywords Reinforced lightweight concrete hollow beams flexural behavior shear behavior cracks hollow lightweight concrete (HLC) solid lightweight concrete (SLC)

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Abstract

Hollow Lightweight Concrete (HLC) beams are gaining popularity due to low cost and low weight as compared with the Solid Lightweight Concrete (SLC) beams. HLC and SLC beams decrease in weight, without losing strength and durability. Flexural and shear behavior of reinforced HLC and SLC beams made with sawdust under two-point load is investigated in this study. The ultimate deformation efficiency and shear resistant mechanism of HLC beams are discussed experimentally and compared with other SLC beams. The beams, tested in this research, are rectangular. Beams were designed and constructed as 12 * 23 * 100 cm. Six concrete beam models were prepared including three SLC beams without the hollow and the other three HLC beams poured hollow 50 * 7.5 cm throughout the all beam of 100 cm. All beams were split according to the distance between vertical stirrups, these stirrups were divided into three specimens 45, 13, and 6 cm. By analyzing six experimental test beams, in this research, investigated the effect of diverse factors on the shear of beams. On comparison with normal concrete beams, this work describes the failure of mechanism, process, and ductility. The first crack loads, ultimate loads, load-deflection behavior, crack patterns and shapes of failure were investigated in this study. The experimental results show the ultimate performance of HLC beams are pure shear and controlled by yielding tension and compression steel bars. Also, it is found that the measured size and configuration of the hollow opening had an effect on the load-carry capacity and mid-span deflection of HLC beams. Thus, the design and construction details of beams can be additionally customized to reduce the total cost and weight of the HLC beams.

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Authors and Affiliations

Salam Salman Chiad Alharishawi

e-mail:

ORCID:

Nagham Rajaa

e-mail:

ORCID:

Lina Abdulsalam Shihab

Mustansiriyah University, College of Engineering, Environmental Engineering Department, Baghdad, Iraq
Mustansiriyah University, College of Engineering, Highway and Transportation Engineering Department, Baghdad, Iraq
Mustansiriyah University, College of Engineering, Civil Engineering Department, Baghdad, Iraq

Experimental investigation of using recycled glass waste as fine aggregate replacement in concrete

Salam Salman Chiad Alharishawi Nagham Rajaa Aqeel Raheem Jabur

Archives of Civil Engineering | 2021 | vol. 67 | No 4 | 27-38 | DOI: 10.24425/ace.2021.138484

Keywords crushed waste glass partial replacement of fine aggregate normal concrete disposal problem mechanical properties

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Abstract

Environmental problems are considered a serious situation in modern construction. Reusing and recycling glass wastes is the only method to decrease waste produced. There is growing environmental compression to decrease glass waste and to reprocess as much as possible. In this investigational work, the effect of partially substituting crushed waste glass in concrete is considered. The study investigates crushed waste glass used as a partial replacement of fine aggregate for new concrete. recycled glass waste was partially replaced as 5%, 10%, 15%, 20%, 25%, 30, 35, 40%, 45%, 45% and 50% and tested at 7, 14 and 28 days of curing at 20◦ for mechanical properties and compared with those of controlled mix. The compressive strength, splitting tensile strength and flexural forces and static elasticity modulus of specimens with 20% waste glass content was 30%, 19.41%, 9.13% and 10.12%, respectively, which is higher than the controlled mix at 28 days. The outcomes displayed that the maximum rise in strength of concrete occurred when 20% replacement with glass crush. It is found that crushed waste glass can be used as fine aggregate replacement material in concrete production.

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Bibliography

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Authors and Affiliations

Salam Salman Chiad Alharishawi

e-mail:

ORCID:

Nagham Rajaa

e-mail:

ORCID:

Aqeel Raheem Jabur

e-mail:

ORCID:

Mustansiriyah University, College of Engineering, Environmental Engineering Department, Baghdad, Iraq
Mustansiriyah University, College of Engineering, Highway and Transportation Engineering Department, Baghdad, Iraq
Mustansiriyah University, College of Engineering, Civil Engineering Department, Baghdad, Iraq

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Shear Stresses of Hollow Lightweight Concrete Beams Made with Wood Waste

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Experimental investigation of using recycled glass waste as fine aggregate replacement in concrete

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Authors and Affiliations