Quality control of subgrade soil using intelligent compaction

Abstract

Intelligent Compaction (IC) of subgrade soil has been proposed to continuously monitor the stiffness of subgrade during its compaction. Modern IC rollers are vibratory compactors equipped with (1) an onboard measuring system capable of estimating the stiffness of the pavement material being compacted, (2) Global Positioning System (GPS) sensor to precisely locate the roller, and (3) an integrated mapping and reporting system. Using IC, the roller operator is able to evaluate the entire subgrade and address deficiencies encountered during compaction. Continuous monitoring of quality during construction can help build better quality and long-lasting pavements. However, most of the commercially available IC rollers report stiffness in terms of Original Equipment Manufacturer (OEM) specified indicator, known as Intelligent Compaction Measurement Value (ICMV). Although useful, additional tests are required to establish the correlation between these ICMV values and the resilient modulus of subgrade (M r ). Since the mechanistic design of the pavement is performed using M r , it is important to know if the design M r is achieved on the entire subgrade during compaction. This paper presents a systematic procedure for monitoring the level of compaction of subgrade in real time using intelligent compaction (IC). Specifically, the Intelligent Compaction Analyzer (ICA) developed at the University of Oklahoma was used for estimating the modulus of the subgrade. Results from two demonstration studies show that the ICA is able to estimate subgrade modulus with an accuracy that is acceptable for quality control activities during the construction of pavements.

Application of Ground Penetrating Radar to Estimate Subgrade Soil Density

“…From the calibration process with a metal plate on top of soil specimen, A m was found to be 7,942,173. Using the measured amplitude values from GPR, dielectric constants for six (6) soil specimens were calculated using Equation (5). Table 3 summarizes the dielectric constant calculated for each specimen.…”

“…The primary material property obtained from GPR surveys is the dielectric constant. The dielectric constant, also known as the relative permittivity, of a homogeneous media relates the relative EM velocity in a material to the speed of light in free space [5]…”

A Spatial Analysis of Subgrade Density Value of Cisumdawu Hihgway (KM 10+700 – 12+000)

“…The development of geostatistics-based technology has been conuducted in several studies. One of which has been done in Oklahome, the US, on the use of Intelligent Compation Analyzer (ICA) device to evaluate the subgrade module when investigating the compaction process [6]. Geostatistical approach used in Intelligent Compaction aims to reach uniformity of the compaction of the pavement layer in an attempt to improve the quality of construction, pavement performance, and construction cost [7].…”

Study on the Transmission and Evolution Characteristics of Vibration Wave from Vibratory Roller to Filling Materials Based on the Field Test

“…However, the vibration wave is a complicated nonlinear non-stationary signal and its vibration frequency and amplitude are constantly changing in the compaction progress. Its order of harmonics cannot be predicted, which will affect the analysis accuracy if it is calculated from the time domain or the frequency domain alone [30][31][32]. Therefore, the jointed time-frequency domain will be a better approach for studying the transmission and evolution characteristics of the vibration signal from the vibratory roller to filling materials in the compaction process.…”