scholarly journals Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

2020 ◽  
Vol 6 (9) ◽  
pp. 1765-1778
Author(s):  
Mohamed Abo El-Naga Kandil ◽  
Ahmed H. Abdelraheem ◽  
Mohamed Mahdy ◽  
Ahmed M. Tahwia
Keyword(s):  
High Strength Concrete ◽  
Sandwich Panels ◽  
Weight Ratio ◽  
High Strength ◽  
Core Material ◽  
Light Weight ◽  
Composite Action ◽  
Strength Concrete ◽  
Concrete Face ◽  
Positive Effect

This study investigates the effects of changing in the properties of face and core wythes in structural sandwich panels (with dimensions of 500 500 mm and 120 mm total height). Concrete face wythes of three grades (80, 70, 37) MPa, thicknesses of (25, 35, and 45) mm, and three types of core materials (high density foam, polyethylene foam, and palm bark) were used in the production of panels. Steel shear connectors were installed in the panels with angle of 45º. Three-point bending load test was carried out on all panels and results were compared with both of the theoretical extremes capacities of non- composite and fully-composite states and ANSYS software results. The degree of composite action (%) and the (strength/weight) ratio were the main parameters that judged the specimens. It was found that upgrading concrete increased overall strength of slabs especially in high strength concrete (80 MPa), however the use of lightweight concrete (70 MPa) caused high (strength/weight) ratio due to very lightweight. Results revealed that decreasing thickness of concrete face wythes had a positive effect on strength/weight ratio (although the ultimate loads decreased) that enhanced the performance of panels as lightweight structural panels. The optimum face wythe thickness is that of 2.5 cm and has high (strength/weight) ratio. It was noticed that adding polyethylene foam as a core material results in positive effect and high (strength/weight) ratio. Results revealed that high strength concrete (80 MPa) and light-weight concrete (37 MPa) are very successful in the production face wythes of precast light-weight sandwich panels that can obtain high (strength/weight) ratio and high percent of composite action.

Comparative Analysis of Axially Loaded Composite Columns

2011 ◽  
Vol 147 ◽  
pp. 99-104 ◽  
Author(s):  
Moftah Almadini ◽  
Dusan Kovacevic ◽  
Vlastimir Radonjanin
Keyword(s):  
Bearing Capacity ◽  
High Strength Concrete ◽  
High Strength ◽  
Light Weight ◽  
Steel Tubes ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Composite Columns ◽  
Strength Concrete ◽  
Light Weight Concrete

Experiments on square and circular steel columns filled with light-weight concrete and high strength concrete have been conducted to investigate the contribution of these types of concrete to load bearing capacity of short composite columns. The aim of this research was to determine the effect of two types of concrete filling on behaviour of the composite columns. Thirteen specimens were divided in two groups: steel tubes filled with different type of concrete, with or without reinforcement and RC columns with same dimensions and shape, made of same type of concrete. Comparison was made between load bearing capacity of the steel tubes filled with light-weight concrete, and high strength concrete (with and without reinforcement). All specimens were tested by axial compression until to the failure state realization. Factors which influence the behavior and failure mode, ultimate strength, deflections and stress-strain relation were discussed.

Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash

2012 ◽  
Vol 2 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Suthar Sunil B ◽  
◽  
Dr. (Smt.) B. K. Shah Dr. (Smt.) B. K. Shah
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Strength Concrete

Applications of High Strength Concrete for Highway Bridges

PCI Journal ◽  
1984 ◽  
Vol 29 (3) ◽  
pp. 44-73 ◽  
Author(s):  
Harold J. Jobse ◽  
Saad E. Moustafa
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Highway Bridges ◽  
Strength Concrete

INOVASI BETON MUTU TINGGI RAMAH LINGKUNGAN SEBAGAI PENUNJANG PEMBANGUNAN NASIONAL

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Almufid Almufid
Keyword(s):  
Work Ability ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete

Beton adalah material komposit (gabungan) dari partikel-partikel agregat yang saling mengikat menjadi suatu badan atau bagian yang solid dengan ikatan dari material semen. Beton juga dikenal dengan material dengan kekuatan tekan yang memadai, mudah dibentuk, mudah diproduksi secara local, relative kaku, dan ekonomis. Namun di sisi lain, beton juga menunjukan banyak keterbataan baik dalam proses produksi maupun sifat-sifat mekaniknya, sehingga beton pada umumnya hanya digunakan untuk konstruksi dengan ukuran kecil dan menengah.Abu sekam padi dihasilkan dari pembakaran sekam padi. Belakangan ini banyak peneliti yang memanfaatkan abu sekam padi dalam suatu bahan seperti pembuatan keramik, pembuatan batu bata, dan lain-lain.Penggunaan tulang hewan dalam penelitian kami adalah sebagai penambahan agregat kasar dalam pembuatan beton. Hal ini dikarenakan jumlah limbah tulang hewan di Indonesia yang sangat banyak dan belum termanfaatkan secara menyeluruh, Dengan beton mutu tinggi dimensi dari struktur dapat diperkecil sehingga berat struktur menjadi ringan. Hal tersebut menyebabkan beban yang diterima pondasi secara keseluruhan menjadi lebih kecil pula. Jika ditinjau dari segi ekonomi hal tersebut tentu akan lebih menguntungkan. Beton mutu tinggi dapat diartikan sebagai beton yang berorientasi pada kekuatan yang tinggi (high strength concrete) yang mempertimbangkan keawetan (durability) beton serta kemudahan pengerjaan beton (work-ability). Kata Kunci  ;   Beton Komposit , Abu Sekam, Penggunaan Tulang dan Beton Mutu Tinggi

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