Pavement safety has been a principal concern of transportation agencies, while tire-pavement nois... more Pavement safety has been a principal concern of transportation agencies, while tire-pavement noise has also gained increasing attentions in recent years. To suppress the impacts of tire-pavement noise on road users, an innovative hybrid texture technique for concrete surface that resembles a combination of diamond grinding and longitudinal grooving, Next Generation Concrete Surface (NGCS), is developed for quieter traveling and improved safety. Since the grooved texture may deteriorate over time, the measurement of groove dimensions becomes an indispensable tool for NGCS's long term performance evaluation. Traditional point laser based profiling system is used to measure pavement transverse grooves. However this technique is incapable of evaluating longitudinal grooves that are used in NGCS. This paper proposes an automated groove identification and measurement methodology for NGCS using 1mm resolution 3D pavement surface data collected from the recently developed PaveVision3D U...
Chloride ingress is one of the major contributing f actors to the corrosion of reinforced concret... more Chloride ingress is one of the major contributing f actors to the corrosion of reinforced concrete structures exposed to deicing salts. Electrical con ductivity and diffusion coefficients are material properties that indicate the resistance to chloride ion transport to concrete. This paper presents an approach to determine the conductivity and diffusio n coefficients using measurements from the chloride ion penetration test (CIPT) data. Equivala nt steady state conditions were verified by comparing the numerical values of conductivity duri ng 5 minute, 10 minute, 30 minute and 360 minute testing period. The Nernst-Einstein relation ship was used to determine the diffusion coefficients from the conductivity measurements for different ternary cementitious systems including the control mixtures. This method of computing the diffusion coefficients includes the necessary adjustments due to the joule effect. Computed diffu sion coefficients and conductivity measurements data showed that t...
Worldwide, anthropogenic contaminants emerge and enter into aquatic systems; their ubiquity in aq... more Worldwide, anthropogenic contaminants emerge and enter into aquatic systems; their ubiquity in aquatic systems poses serious threats to both human health and ecological systems. As the demand for water continues to grow with population, treatment of wastewater and remediation of polluted aquatic systems are of critical concern. Ozonation and advanced oxidation processes (AOPs) are promising methods for removal of numerous waterborne contaminants. In this thesis, three groups of waterborne organic contaminants have been studied for degradation by uses of ozone and ozone in combination with hydrogen peroxide. Specifically, the study compounds are methyl tertiary-butyl ether (MTBE), six endocrine disruptor compounds (EDCs) and pharmaceutical and personal care products (PPCPs) chemicals that include dibutyl phthalate (DBP), diethyl phthalate (DEP), dimethyl phthalate (DMP), di(2-ethylhexyl) phthalate (DEHP), bisphenol A (BPA), triclosan (TCS), and two naphthenic acids (NAs) including Cy...
Concrete containing limestone blended cement or blended cement with limestone and fly ash have no... more Concrete containing limestone blended cement or blended cement with limestone and fly ash have noticeably different thermal properties. Maximum temperature rise due to cement hydration plays an important role on delayed ettringite formation and thermal cracking of the concrete. However, the maximum temperature rise due to cement hydration in the mass concrete floor would be different from thin slabs. The purpose of this study is to provide such difference for concrete with limestone blended cement and fly ash type C. In this study, results of thermocouple measurement at a new construction laboratory are compared via a 1.22m thick mass concrete floor and a 0.18m thin slab at the edge and center point of the foundation. The mass floor includes the virtical steel anchors which conduct the generated hydration heat to the bottom and surface of the slab. The results show that hydration heat is accumulated at the middle of the mass floor. Also, temperature profile of the thin slab and bottom heat flux records mostly follow the ambient temperature. In addition, the bottom of the mass floor is affected by hydration heat conducted by vertical steel.
This paper presents an approach for determining the chloride migration rate of hardened concrete ... more This paper presents an approach for determining the chloride migration rate of hardened concrete by applying fundamental electrochemistry for different cementitious mixtures using the measurements from the chloride-ion penetration test (CIPT) data following ASTM C1202 specifications. ...
Pavement safety has been a principal concern of transportation agencies, while tire-pavement nois... more Pavement safety has been a principal concern of transportation agencies, while tire-pavement noise has also gained increasing attentions in recent years. To suppress the impacts of tire-pavement noise on road users, an innovative hybrid texture technique for concrete surface that resembles a combination of diamond grinding and longitudinal grooving, Next Generation Concrete Surface (NGCS), is developed for quieter traveling and improved safety. Since the grooved texture may deteriorate over time, the measurement of groove dimensions becomes an indispensable tool for NGCS's long term performance evaluation. Traditional point laser based profiling system is used to measure pavement transverse grooves. However this technique is incapable of evaluating longitudinal grooves that are used in NGCS. This paper proposes an automated groove identification and measurement methodology for NGCS using 1mm resolution 3D pavement surface data collected from the recently developed PaveVision3D U...
Chloride ingress is one of the major contributing f actors to the corrosion of reinforced concret... more Chloride ingress is one of the major contributing f actors to the corrosion of reinforced concrete structures exposed to deicing salts. Electrical con ductivity and diffusion coefficients are material properties that indicate the resistance to chloride ion transport to concrete. This paper presents an approach to determine the conductivity and diffusio n coefficients using measurements from the chloride ion penetration test (CIPT) data. Equivala nt steady state conditions were verified by comparing the numerical values of conductivity duri ng 5 minute, 10 minute, 30 minute and 360 minute testing period. The Nernst-Einstein relation ship was used to determine the diffusion coefficients from the conductivity measurements for different ternary cementitious systems including the control mixtures. This method of computing the diffusion coefficients includes the necessary adjustments due to the joule effect. Computed diffu sion coefficients and conductivity measurements data showed that t...
Worldwide, anthropogenic contaminants emerge and enter into aquatic systems; their ubiquity in aq... more Worldwide, anthropogenic contaminants emerge and enter into aquatic systems; their ubiquity in aquatic systems poses serious threats to both human health and ecological systems. As the demand for water continues to grow with population, treatment of wastewater and remediation of polluted aquatic systems are of critical concern. Ozonation and advanced oxidation processes (AOPs) are promising methods for removal of numerous waterborne contaminants. In this thesis, three groups of waterborne organic contaminants have been studied for degradation by uses of ozone and ozone in combination with hydrogen peroxide. Specifically, the study compounds are methyl tertiary-butyl ether (MTBE), six endocrine disruptor compounds (EDCs) and pharmaceutical and personal care products (PPCPs) chemicals that include dibutyl phthalate (DBP), diethyl phthalate (DEP), dimethyl phthalate (DMP), di(2-ethylhexyl) phthalate (DEHP), bisphenol A (BPA), triclosan (TCS), and two naphthenic acids (NAs) including Cy...
Concrete containing limestone blended cement or blended cement with limestone and fly ash have no... more Concrete containing limestone blended cement or blended cement with limestone and fly ash have noticeably different thermal properties. Maximum temperature rise due to cement hydration plays an important role on delayed ettringite formation and thermal cracking of the concrete. However, the maximum temperature rise due to cement hydration in the mass concrete floor would be different from thin slabs. The purpose of this study is to provide such difference for concrete with limestone blended cement and fly ash type C. In this study, results of thermocouple measurement at a new construction laboratory are compared via a 1.22m thick mass concrete floor and a 0.18m thin slab at the edge and center point of the foundation. The mass floor includes the virtical steel anchors which conduct the generated hydration heat to the bottom and surface of the slab. The results show that hydration heat is accumulated at the middle of the mass floor. Also, temperature profile of the thin slab and bottom heat flux records mostly follow the ambient temperature. In addition, the bottom of the mass floor is affected by hydration heat conducted by vertical steel.
This paper presents an approach for determining the chloride migration rate of hardened concrete ... more This paper presents an approach for determining the chloride migration rate of hardened concrete by applying fundamental electrochemistry for different cementitious mixtures using the measurements from the chloride-ion penetration test (CIPT) data following ASTM C1202 specifications. ...
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Papers by paul tikalsky