Aspects of Structural Design of Drilled Shafts for Flexure

Sarhan, Hazem; O’Neill, Michael W.

doi:10.1061/40601(256)82

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…Pengujian Non-Destructive pondasi tiang yang dibor melalui Crosshole Sonic Logging (CSL) sering dilakukan sebagai bagian dari proses jaminan kualitas untuk menilai kesehatan beton. Maksud dari pengujian CSL adalah untuk mengidentifikasi ketidakteraturan seperti intrusi tanah, necking, soft bottom, segregasi, rongga dan cacat lainnya yang dapat mengakibatkan kinerja struktur pondasi menjadi buruk [11].…”

Section: Gambar 1 Lokasi Jembatan Pulau Balang IIunclassified

“…Mengatasi cacat harus mencakup minimal evaluasi dengan tomografi jika area yang menjadi perhatian dilokalisasi, dan/atau tindakan tambahan seperti penggalian dan perbaikan jika cacat berada di dekat bagian atas tiang, tindakan coring dan grouting dilakukan jika cacat berada di kedalaman tertentu, atau dalam beberapa kasus cacat yang ditunjukkan pada seluruh penampang tiang memerlukan perbaikan atau penggantian tiang. Senada dengan penelitian Sarhan dan O'Neill [11] menyebutkan bahwa cacat yang cukup besar dideteksi oleh metode evaluasi non-destruktif (NDE) hampir selalu diperbaiki atau tiang yang di bor diganti, sedangkan efek dari cacat kecil yang tidak terdeteksi harus diperhitungkan dalam desain. Cacat besar akan menyebabkan penundaan First Arrival Time (FAT) yang signifikan dan penurunan energi relatif.…”

Section: ) Tiang Bor P1-64unclassified

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Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II

Hartono

2021

JITS

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Section: Gambar 1 Lokasi Jembatan Pulau Balang IIunclassified

Section: ) Tiang Bor P1-64unclassified

Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II

Hartono

2021

JITS

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“…where C = the measured ZRA current in µA, and a c = the surface area of the mild steel coupon in in. 2 .…”

Section: Evaluation Of Corrosion Ratementioning

confidence: 99%

“…Reported incidences of voids or soil inclusions in completed drilled shafts have occurred when shafts used for excavation support have been exposed or when embedded shafts have been subjected to nondestructive testing. When such flaws are small, the effect on structural behavior may be small and predictable if reinforcing steel exposed through the flaw does not corrode excessively (1,2). The literature contains a number of important papers and reports on the corrosion of steel in saturated and unsaturated soil (3)(4)(5).…”

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confidence: 99%

Corrosion of Reinforcing Steel in Drilled Shafts with Construction Flaws

Sarhan

O’Neill

Simon³

2002

Transportation Research Record: Journal of the Transportation R

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The construction process for drilled shafts sometimes introduces structural flaws such as voids or soil inclusions within the shaft. In that case, the reinforcing steel loses concrete cover and comes in contact with the surrounding soil medium, which creates a favorable environment for corrosion. Corrosion of steel inside concrete, as well as in soil media, has been investigated in the literature. However, the specific case of steel passing through different media (concrete and soil) simultaneously has received little attention. The results of an experimental program designed to investigate the effect of two different media of substantially different pH values on the rate of corrosion of steel reinforcement in sand and clay soils and with different anode-to-cathode-area ratios are presented. Preliminary results suggest that galvanic currents driven by dissimilar media could increase the corrosion rate of exposed steel by 3.3 to 5.6 times, particularly in environments with otherwise low corrosion potential.

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“…Bored pile foundations are defined as deep foundations in the form of elongated tubes made of reinforced concrete with a specific diameter installed using the drilling methods with reinforcement installation and concrete casting carried out in the field or cast in situ [1]. The application of a cast in-situ system in bored holes below the ground surface, especially those affected by groundwater, requires special attention regarding the integrity of the cast concrete, such as necking (reduction), bulging (enlargement), soft-top or soft-bottom, segregation, voids, and other defects that can result in poor foundation performance [2]. The pile integrity testing method is divided into destructive test (DT) and non-destructive test (NDT).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Concrete Age on the Accuracy of Pile Integrity Testing on Bored Piles Foundation

Santoso,

Hartono,

Andani

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Bored pile foundations are defined as deep foundations in the form of an elongated tube with a specific diameter made of reinforced concrete installed using the drilling method and in-situ casting concrete. The cast in-situ process in bored holes with a deep elevation below the ground surface can potentially cause integrity problems, such as voids, segregation, fracture, necking, bulging, and other concrete defects. Currently, many non-destructive test methods are available to ensure the quality of the bored pile; one is the Low Strain Integrity Testing method, also known as Pile Integrity Testing (PIT). ASTM recommends that PIT should be carried out no sooner than 7 days after casting or the strength of the concrete has reached a minimum of 75,0% of its design strength. In fact, the PIT test is carried out before the concrete’s age and/or its strength is achieved, considering the limited construction time. This could lead to misinterpretation of the PIT test results and inaccurate identification of the bored pile defect locations. The study aims to determine the effect of concrete age on the accuracy of bored pile defect locations on a laboratory scale. The test model consisted of four bored piles with a diameter of 0,3 meters and a depth of 2,0 meters, which were cast using reinforced concrete with a design strength of fc’ 30 MPa. The PIT was performed at <7, 14, and 28 days of concrete age, and then the confusion matrix method was used to create a binary classification model to determine the accuracy of the defect location. The defect locations were visually observed and validated by dismantling the test model after 28 days of casting. The results showed that the accuracy of identifying the location of concrete defects was not affected by the age of the concrete but was determined by the compressive strength of the concrete during testing. Referring to the F-score, bored piles with concrete strength >75,0% of the design accurately identify defect locations above 84,21%. On the other hand, bored piles with concrete strength <75,0% design resulted in accuracy below 66,67%.

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Aspects of Structural Design of Drilled Shafts for Flexure

Cited by 5 publications

References 6 publications

Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II

Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II

Corrosion of Reinforcing Steel in Drilled Shafts with Construction Flaws

The Influence of Concrete Age on the Accuracy of Pile Integrity Testing on Bored Piles Foundation

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