Performance Evaluation of the Pretensioned Spun High Strength Concrete Piles (PHC) Using Recycled Concrete Aggregate

The preparation of concrete mixtures can be tailored to provide wide range of mechanical and durability properties as well as to meet the design specifications of the structure. This paper discusses the potential use of recycled concrete aggregate in the production of high strength concrete. The effect of other processing parameters such as aggregate replacement ratio, type of admixture and slump height on the compressive strength and water absorption rate of different concrete mixes were investigated. The fabrication of high strength concrete was done by machine-mixing of the aggregates, cement and admixture in accordance with ASTM C192, utilizing the Taguchi design to derive the concrete mixtures. Using the 10% recycled fine aggregate with Mira P99 admixture and slump height of 4-6 inches showed an optimum condition and yielded a predicted maximum compressive strength at around 8400 psi. The failure mode of the concrete after compression test was generally shear fracture type. For the water absorption rate, only the admixture had a significant effect. Surface morphology of the fractured concrete surface revealed that utilizing recycled concrete aggregate resulted to a porous surface morphology compared to the natural aggregate.

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Seismic behaviour of prestressed high-strength concrete piles under combined axial compression and cyclic horizontal loads

Advances in Structural Engineering ◽

10.1177/1369433218806191 ◽

2018 ◽

Vol 22 (5) ◽

pp. 1089-1105 ◽

Cited By ~ 2

Author(s):

Xizhi Zhang ◽

Sixin Niu ◽

Jia-Bao Yan ◽

Shaohua Zhang

Keyword(s):

Finite Element ◽

Axial Compression ◽

High Strength Concrete ◽

High Strength ◽

Element Model ◽

Test Results ◽

Seismic Behaviour ◽

Strength Concrete ◽

Concrete Piles ◽

Concrete Pile

In order to simulate the seismic behaviour of the prestressed high-strength concrete piles under working state, six full-scale prestressed high-strength concrete piles were tested under combined axial compression and cyclic horizontal loads. Different axial compression levels and prestressing levels of prestressed tendons were studied in this test programme. The failure mode, bending resistance, displacement ductility, stiffness degradation and energy dissipation of the prestressed high-strength concrete piles under different loading scenarios were measured and analysed. Test results indicated that the axial compression ratio and prestressing level of prestressed tendon significantly influenced the seismic performance of prestressed high-strength concrete piles. Theoretical models were developed to predict cracking, yielding and ultimate bending resistances of the prestressed high-strength concrete pile under combined compression and bending. Finite element model was also developed to simulate the ultimate strength behaviour of the prestressed high-strength concrete pile under combined compression and flexural bending. The accuracies of the theoretical and finite element model were checked through validations of their predictions against the reported test results.

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Seismic performance of prestressed high strength concrete piles

Materials Research Innovations ◽

10.1179/1432891714z.000000000488 ◽

2014 ◽

Vol 18 (sup2) ◽

pp. S2-515-S2-521

Author(s):

T. C. Wang ◽

Z. J. Yang ◽

H. L. Zhao ◽

W. J. Wang

Keyword(s):

Seismic Performance ◽

High Strength Concrete ◽

High Strength ◽

Strength Concrete ◽

Concrete Piles

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Performance evaluation of structural concrete using controlled quality coarse and fine recycled concrete aggregate

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2015.02.009 ◽

2015 ◽

Vol 61 ◽

pp. 36-43 ◽

Cited By ~ 44

Author(s):

Abdurrahmaan Lotfy ◽

Mahmoud Al-Fayez

Keyword(s):

Performance Evaluation ◽

Recycled Concrete ◽

Concrete Aggregate ◽

Recycled Concrete Aggregate ◽

Structural Concrete

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