HVJ Associates | Engineering Services Texas

City of Lubbock Pavement Evaluation Systems
Lubbock, Texas

HVJ provided pavement management services including a complete inventory and condition survey of all City streets.  This included 888 miles of arterials, 656 miles of local streets, and 700 miles of alleys.  HVJ developed the Street Inventory using our IMMP database; linked the database to the City’s GIS system; implemented a work order system; developed and reported a 10-year rehabilitation and maintenance plan; and surveyed all traffic signs and signals.  In addition, HVJ developed the condition rating software, survey procedures and criteria for a complete survey of Lubbock’s street signs. The criteria includes GPS coordinate location, photographs, sign geometry criteria, and retro-reflectivity readings. The goal of the final productwas to bring Lubbock’s street sign inventory into compliance with federal regulations regarding retro-reflectivity levels and sign readability. 

George Bush International Deflection Testing and Pavement Analysis, Taxiway WP
Houston, Texas

HVJ provided nondestructive Falling Weight Deflectometer (FWD) testing and engineering to evaluate the strength of the lime cement fly-ash (LCF) stabilized base made with recycled crushed concrete used in the construction of Taxiway WP at George Bush Intercontinental Airport in Houston, Texas.

Services Provided: The LCF base layer was constructed in the summer of 2001 and had been surfaced with the new Portland cement concrete (PCC) pavement. Good strength results were obtained from tests on limited oven cured samples and cores taken from the pavement. Lab molded samples, which were room cured, had lower strengths. The FWD testing and analysis was performed to help confirm the existing in-situ base strength along the length of the taxiway. 

HVJ conducted nondestructive pavement deflection testing using a Dynatest Model 8000 Falling Weight Deflectometer (FWD). The scope of FWD testing included: performed FWD deflection tests, plot deflection profiles, developed an estimate of the layer moduli using back-calculation techniques, and collected cores of the Lime Cement Fly-ash (LCF) Stabilized Recycled Crushed Concrete Base layer for further strength testing. Plots of deflection versus location or distance were developed to visually analyze the deflection profile to identify variations in cross section and subgrade support. The Modulus 5.1 back-calculation program prepared by Texas Transportation Institute for the Texas Department of Transportation was used to develop elastic modulus values for Taxiway WP pavement layers and the subgrade.

Dr. Dallas Little, Texas A&M materials expert, also provided input and analysis of previously collected laboratory test results on resilient modulus values and variability. The FWD and laboratory analysis demonstrated that Taxiway WP had a very substantial structural capacity roughly equivalent to over 20-inches of PCC with a modulus of over 4,000,000 psi resting on a uniform and strong subbase. This was verified by “Spreadibility” analysis and by comparison with deflection data from an earlier study. In conclusion, the LCF layer was determined to be providing excellent strength at the time of the study. 

George Bush International Rehabilitation of Runway 15L-33R
Houston, Texas

This project involved rehabilitation of the existing runway and taxiway to improve the structural capacity to meet the current and foreseeable aircraft mix and traffic levels in the next 20 years.   HVJ provided services to support several phases, including the runway overlay, shoulder reconstruction, and taxiway overlay and reconstruction transitions.  The required services were provided in general accordance with the Geotechnical Scope of Services provided by Klotz Associates, Inc.  The scope included performing Heavy Weight Deflectometer (HWD) tests, runway and taxiway pavement coring, field CBR tests, Dynamic Cone Penetrometer (DCP) test, soil borings, splitting tensile tests on concrete cores, and performing standard laboratory tests on soil samples.  Results of the field and laboratory tests were reduced and compiled into a data report for Klotz. 

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