@article{malladi_castorena_2019, title={Field measurements of emulsion application rates and pavement emulsion absorption in tack coats and chip seals}, volume={218}, ISSN={["1879-0526"]}, url={https://doi.org/10.1016/j.conbuildmat.2019.05.105}, DOI={10.1016/j.conbuildmat.2019.05.105}, abstractNote={Abstract Simple and practical test frameworks for field measurements of Emulsion Application Rates (EARs) in chip seal and tack coat applications are identified. The methods identified allow for local in situ measurements of the EAR that can be obtained during construction. For both tack coats and chip seals, the test methods identified allow for determining the EAR from residual binder application rate measurements combined with the emulsion water content. Implementation of the test frameworks established in this study could be used as part of a quality assurance/quality control program.}, journal={CONSTRUCTION AND BUILDING MATERIALS}, publisher={Elsevier BV}, author={Malladi, Haritha and Castorena, Cassie}, year={2019}, month={Sep}, pages={701–711} }
 @article{fried_malladi_castorena_2019, title={Impact of Crack Sealant on Pavement Skid Resistance}, volume={2673}, ISSN={["2169-4052"]}, DOI={10.1177/0361198119849590}, abstractNote={Crack sealing is often a cost-effective preventive maintenance strategy for prolonging pavement service life when applied to pavements in relatively good condition. Crack sealing is generally ineffective for extending the life of heavily cracked pavements. However, crack sealing is often applied to pavements with extensive cracking. The application of crack sealing to pavements with extensive cracking can pose a skid resistance hazard. This study investigates the relationship between the amount and distribution of crack sealant application and pavement skid resistance. Locked-Wheel Skid Tester (LWST) testing was conducted on several pavement projects in North Carolina, United States, with varying amounts and patterns of crack sealant. Images of the locations of LWST testing were obtained and processed to determine the percentage of the pavement surface area covered by crack sealant. A relationship between the percentage of the wheel path covered by crack sealant and LWST results was established that demonstrates the application of high amounts of crack sealant to the wheel path can pose safety hazards. The effect of crack sealant on pavement skid resistance is a function of the existing pavement’s frictional characteristics. The results of this study highlight the need for the development of crack sealant specification provisions to avoid the loss of skid resistance.}, number={7}, journal={TRANSPORTATION RESEARCH RECORD}, author={Fried, Andrew and Malladi, Haritha and Castorena, Cassie}, year={2019}, month={Jul}, pages={362–370} }
 @article{malladi_asnake_lacroix_castorena_2018, title={Low-Temperature Vacuum Drying Procedure for Rapid Asphalt Emulsion Residue Recovery}, volume={2672}, ISSN={["2169-4052"]}, DOI={10.1177/0361198118791913}, abstractNote={Asphalt emulsions are used extensively in tack coats and preservation surface treatments. The current specifications for asphalt emulsion residue recovery in AASHTO PP 72 are based on low-temperature evaporative drying. The shortest residue recovery procedure included in AASHTO PP 72 requires 6 h of conditioning in an oven to dry an emulsion. The ability to recover emulsion residues efficiently is of great interest given the ongoing efforts to develop emulsion performance-graded specifications based on residual binder properties. In this study, a rapid, vacuum drying technology was evaluated for asphalt emulsion residue recovery. The procedure enables the recovery of sufficient residual binder for dynamic shear rheometer (DSR) testing within 20–40 min. Five emulsions of different classifications were evaluated using both the vacuum drying procedure and the AASHTO PP 72 procedures. The vacuum drying procedure leads to similar water loss to the AASHTO PP 72 procedures. Based on the temperature-frequency sweep and multiple stress creep and recovery (MSCR) test results, the vacuum-dried residues are softer and more viscous than residues recovered using the AASHTO PP 72 procedures. Fourier transform infrared spectroscopy (FTIR) was performed to identify if oxidation levels could explain the observed in rheological trends. However, the results suggest no clear trend in the oxidation levels of residues recovered using AASHTO PP 72 compared with the rapid vacuum procedure. Future work is necessary to infer which method best reflects residual binders placed in the field.}, number={28}, journal={TRANSPORTATION RESEARCH RECORD}, author={Malladi, Haritha and Asnake, Meron and LaCroix, Andrew and Castorena, Cassie}, year={2018}, month={Dec}, pages={256–265} }
 @article{kusam_malladi_tayebali_khosla_2017, title={Laboratory Evaluation of Workability and Moisture Susceptibility of Warm-Mix Asphalt Mixtures Containing Recycled Asphalt Pavements}, volume={29}, ISSN={["1943-5533"]}, DOI={10.1061/(asce)mt.1943-5533.0001825}, abstractNote={AbstractWarm mix asphalt (WMA) and recycled asphalt pavements (RAP) are two popularly used sustainable technologies in pavement industry. Because RAP materials contain aged binder, its use is limit...}, number={5}, journal={JOURNAL OF MATERIALS IN CIVIL ENGINEERING}, author={Kusam, Abhilash and Malladi, Haritha and Tayebali, Akhtarhusein A. and Khosla, N. Paul}, year={2017}, month={May} }
 @article{malladi_ayyala_tayebali_khosla_2015, title={Laboratory Evaluation of Warm-Mix Asphalt Mixtures for Moisture and Rutting Susceptibility}, volume={27}, ISSN={["1943-5533"]}, DOI={10.1061/(asce)mt.1943-5533.0001121}, abstractNote={AbstractSince its introduction, warm mix asphalt (WMA) has garnered a lot of attention and interest from the pavement industry as a promising technology to replace the conventional hot mix asphalt (HMA). Despite its many benefits, including reducing emissions and fuel usage, definitive answers on the feasibility of replacing HMA pavements with WMA are yet to be answered. A major concern for WMA is susceptibility to moisture-induced damage. In this research study, mixtures prepared using three WMA technologies- viz. Sasobit, Advera WMA and the Foamer were evaluated for their moisture susceptibility and permanent deformation in comparison with an HMA mixture. Tensile strength ratio (TSR) and asphalt pavement analyzer (APA) tests were conducted on these mixtures. Results show that moisture-based WMA technologies (Advera and Foamer) are more susceptible to moisture damage. However, rut depths evaluated using APA, even for moisture-conditioned specimens, indicated WMA performance on par with that of HMA. Even ...}, number={5}, journal={JOURNAL OF MATERIALS IN CIVIL ENGINEERING}, author={Malladi, Haritha and Ayyala, Dinesh and Tayebali, Akhtarhusein A. and Khosla, N. Paul}, year={2015}, month={May} }
 @inproceedings{ayyala_malladi_khosla_tayebali_2014, title={Evaluation of warm mix asphalt technology for surface mixtures}, DOI={10.1201/b17219-88}, abstractNote={Economic, environmental, and engineering benefits led to the rapid implementation of Warm-Mix Asphalt (WMA) during the past decade. While WMA technologies are generally performing well to date, development of standard mix design protocols continues and performance questions remain. This study evaluated laboratory conditioning protocols for WMA to simulate early life when they are more moisture susceptible and proposed 2 hours at 116°C for mix design and reheating to this temperature for quality assurance for all WMA technologies except foaming which requires reheating to 135°C. Next, WMA was shown to be more moisture susceptible as compared to Hot-Mix Asphalt in the early life based on a comprehensive analysis of three standard laboratory tests (wet and dry indirect tensile strengths and resilient modulus and their ratios and Hamburg Wheel Tracking Test stripping parameters) from four field projects that included nine WMA mixtures. Finally, an evaluation of performance evolution showed that WMA can overcome this vulnerability to moisture after a summer of aging and proposed 5 days oven aging at 85°C to capture this effect in the laboratory. Proposed conditioning protocols, aging protocols, and criteria for the tests utilized are provided for WMA mix design and analysis to preclude moisture susceptibility.}, booktitle={Asphalt Pavements, vol 1}, author={Ayyala, D. and Malladi, H. and Khosla, N. P. and Tayebali, A. A.}, year={2014}, pages={701–708} }