Structural Resistance Factors for Drilled Shafts Considering Construction Flaws

O’Neill, Michael W.; Sarhan, Hazem

doi:10.1061/40743(142)10

Cited by 17 publications

(11 citation statements)

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“…Anomalies greater than 10% of the cross-sectional area will be detected by multiple measuring locations. Anomalies smaller than 10% of cross-sectional area will generally be detected only at the nearest measuring location, but these small anomalies are typically relatively insignificant and the shaft might still be used considering a reduced structural strength (O'Neill and Sarhan, 2004).…”

Section: Figure 2 Thermal Results Showing Cage Offsetmentioning

confidence: 99%

Using Thermal Integrity Profiling to Confirm the Structural Integrity of Foundation Applications

Piscsalko¹,

Cotton²,

Belardo³

et al. 2015

Ifcee 2015

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Quality of cast-in-place foundation applications, including Augered-Cast-in-Place (ACIP) piles and Drilled Shafts (particularly those cast under slurry) is greatly dependent upon the practices of the site personnel. Due to the installation techniques used to install these elements, it is usually not possible to inspect the hole through any Non-Destructive Test (NDT) method prior to grout or concrete placement, but there are several NDT methods available to indirectly assess the integrity of these completed elements. This paper will compare several NDT methods with the method of Thermal Integrity Profiling (TIP) for confirming integrity in ACIP piles and drilled shafts. The TIP method evaluates the integrity over 100% of the element cross section by measuring the hydration temperature during the early curing of the grout/concrete along the length of the element. The temperature measurements are typically concluded within 4 to 48 hours after placement, thus accelerating construction. For the generally small diameter ACIP piles, meaningful measurements often can be at as little as 4 to 8 hours after casting. The use of TIP in ACIP piles and Drilled Shafts can effectively overcome several limitations inherent in other NDT methods. Thermal Integrity Profiling will be described and several examples will be presented where TIP testing was used to confirm the structural integrity of ACIP piles and Drilled Shafts.

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Section: Figure 2 Thermal Results Showing Cage Offsetmentioning

confidence: 99%

Using Thermal Integrity Profiling to Confirm the Structural Integrity of Foundation Applications

Piscsalko¹,

Cotton²,

Belardo³

et al. 2015

Ifcee 2015

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“…O' Neill dan Sarhan [9] dalam survei lebih dari 10.000 tiang melaporkan deteksi "cacat" di sekitar 20% hingga 25% dari semua tiang menggunakan berbagai metode Evaluasi Non-Destruktif (NDE) seperti Crosshole Sonic Logging (CSL) atau Gamma Gamma Logging (GGL). Hasil Konsensus menyatakan bahwa metode Crosshole Sonic Logging (CSL) adalah yang terbaik.…”

Section: Gambar 1 Lokasi Jembatan Pulau Balang IIunclassified

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

Hartono

2021

JITS

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“…(3) TDR probe with PVC insulation of thickness 0.64 mm. (4) Dielectric constant was unmeasurable due to conduction loss.…”

Section: Construction Of Model Pilementioning

confidence: 99%

“…However, necking defects are occasionally introduced in the bored pile during or after the construction due to soil inclusion, poor concrete stiffness, intrusion of ground water, and slurry, among others [ 3 ]. It has been reported that 20.1% of bored piles are defective [ 4 ]. Thus, pile integrity tests for the detection of necking defects are necessary to ensure the safety of bored piles.…”

Section: Introductionmentioning

confidence: 99%

Variations in Velocity and Sensitivity of Electromagnetic Waves in Transmission Lines Configured in Model Piles with Necking Defects Containing Soils

Kim

Lee

2020

Sensors

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This study investigates variations in the velocity and sensitivity of electromagnetic waves in transmission lines configured in defective model piles for the detection of necking defects containing soil. Experiments are performed with model piles containing defects filled with different materials, such as air, sands, and clay. Five different types of transmission lines are configured in model piles. The electromagnetic waves are generated and detected using a time domain reflectometer. The velocity of electromagnetic waves is highest when the defect is filled with air, and it decreases with an increase in the water content. The velocity is lowest when the defect is filled with clay. The sensitivity of transmission lines for detecting defects decreases with an increase in soil water contents. The transmission line with a single electrical wire and epoxy-coated rebar exhibits the highest sensitivity, followed by that with three and two parallel electrical wires. Transmission lines with a single electrical wire and uncoated rebar and those with two parallel electrical wires wrapped with a sheath exhibit poor sensitivity when the defect is filled with clay. This study demonstrates that electromagnetic waves can be effective tools for detecting necking defects with wet and conductive soils in bored piles.

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Structural Resistance Factors for Drilled Shafts Considering Construction Flaws

Cited by 17 publications

References 0 publications

Using Thermal Integrity Profiling to Confirm the Structural Integrity of Foundation Applications

Using Thermal Integrity Profiling to Confirm the Structural Integrity of Foundation Applications

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

Variations in Velocity and Sensitivity of Electromagnetic Waves in Transmission Lines Configured in Model Piles with Necking Defects Containing Soils

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