Claudia P. Ostertag

Professor Emerita
Research Interests
Digital fabrication, 3D printing of lattice reinforcements, Ductility enhancement of cement-based materials, Multifunctional facade systems for energy-efficient buildings, High-Performance Fiber reinforced concrete composites
Office

729 Davis Hall

Office Hours

During Spring 2023:

By Appointment

Ostertag headshot

Claudia Ostertag is the T.Y. and Margaret Lin Chair of Engineering and the Vice Chair for Research & Technical Support in Civil and Environmental Engineering. Ostertag’s research focuses on light-weight, multifunctional façade systems for energy-efficient buildings, the development, mechanical properties & structural applications of High-Performance Fiber reinforced concrete composites, and durability enhancement through multi-scale crack control, corrosion mitigation, alkali-silica reaction mechanisms, and mitigation strategies. She is the recipient of the prestigious IAAM Scientist Medal Award in 2023, the UC Berkeley Chancellor’s Unsung Hero Award in 2005, and the National Science Foundation CAREER Award in 1996, among other notable accolades.

Education

Ph.D., Materials Science, University of California at Berkeley, 1985

M.S., Materials Science, University of Stuttgart, Germany, 1981
 

Ostertag’s research focuses on digital fabrication and 3D printing of lattice reinforcements for ductility enhancement of cement-based materials, light-weight, multifunctional façade systems for energy-efficient buildings, development, mechanical properties & structural applications of High-Performance Fiber reinforced concrete composites, and durability enhancement through multi-scale crack control, corrosion mitigation, alkali-silica reaction mechanisms, and mitigation strategies.

Only the most recent Archival Journal Papers (2016-2023) are listed here on "various" topics: (for additional publications and publications prior to 2016, please see my CV)

1) 3D printing and Digitally-fabricated reinforcements for mechanical performance enhancement & phase change material encapsulation

  • Shao, Y., and Ostertag, C.P., “LEGO-Inspired and digitally-fabricated steel reinforcement case for ultra-high performance concrete (UHPC) beams, Engineering structures, 279 (2023) 115617. https://doi.org/10.1016/j.engstruct.2023.115617
  • Salazar, B., Aghdasi, P., Ostertag, C.P., Taylor, H., “Highly compressible concrete: the effect of reinforcement design on concrete’s compressive behavior at high strains”, Materials and Design, 230 (2023) 11942. https://doi.org/10.1016/j.matdes.2023.111942  
  • Maier, M., Salazar, B., Aghdasi, P., Unluer, C., Taylor, H., Ostertag, C.P., “Thermal and mechanical performance of a novel 3D printed lattice macro-encapsulation method for phase change materials”, Journal of Building Engineering, 43 (2021), 103124. 
  • Salazar, B., Aghdasi, P., Williams, I., Ostertag, C.P., Taylor, H., “Polymer lattice-reinforcement for enhanced ductility of concrete”, Materials and Design, 2020, Vol. 196, 109184.  https://doi.org/10.1016/j.matdes.2020.109184
  • Lowke, D., Talke, D., Dressler, I., Weger, D., Gehlen, C., Rael R., Ostertag,  C.P. “Particle-bed 3D-printing by selective cement activation – Applications, material and process technology”, Cement and Concrete Research, 2020, Vol. 134, 106077. https://doi.org/10.1016/j.cemconres.2020.106077
  • Aghdasi, P., I. Williams, B. Salazar, N. Panditi, H. Taylor, and C.P. Ostertag, “An Octet-Truss Engineered Concrete (OTEC) for Lightweight Structures,” Composite Structures, 2018, Vol. 207, pp. 373-384.

2) Sustainability; Life cycle analysis; Global warming potential, low CO2 cement, etc

  • Will Nguyen, Daniela Martinez Lopez, Gabriel Jen and C. P. Ostertag; "Interaction between global warming potential, durability, and structural properties of fiber-reinforced concrete with high waste materials inclusion" Resources, Conservation & Recycling, 2021, Vol. 169, 105453. https://doi.org/10.1016/j.resconrec.2021.105453
  • Maier, M., Javadian, A., Saeidi, N., Inluer, C., Taylor, H., Ostertag, C.P., “Mechanical Properties and Flexural Behavior of Sustainable Bamboo Fiber-Reinforced Mortar”, Applied Sciences, Sept. 2020, Vol. 10, 6587.  https://doi.org/10.3390/app10186587
  • Gursel, P. and Ostertag, C.P., “Copper Slag, a Sustainable Solution for Sand Substitution in Concrete”, Advances in Civil Engineering, 2019,https://doi.org/10.1155/2019/6815348
  • Gursel, P. and Ostertag, C.P., “Comparative Life-Cycle Impact Assessment of Concrete Manufacturing in Singapore”, International Journal of Life Cycle Assessment, Feb. 2017, Vol. 22, pp. 237–255. 
  • Gursel, P. and Ostertag, C.P., “Impact of Singapore's Importers on Life-Cycle Assessment of Concrete”, Journal of Cleaner Production, April 2016, Vol. 118, pp. 140-150. 
  • Miller, S., Monteiro, P. J., Ostertag, C.P., and Horvath, A., “Comparison Indices for Design of Concrete taking Environmental Impacts into Account” Cement and Concrete Composites, April 2016, Vol. 68, pp.131-143.
  • Miller, S., Monteiro, P. J., Ostertag, C.P., and Horvath, A., “Concrete Mix Proportioning for Desired Strength and Reduced Global Warming Potential”, Construction and Building Materials, Dec. 2016, Vol. 128, pp. 410-421. 
  • Gursel, A. P., Maryman, H., and Ostertag, C.P., “A Life-Cycle Approach to Environmental, Mechanical, and Durability Properties of “Green” Concrete Mixes with Rice Husk Ash”, Journal of Cleaner Production, 2015 http://dx.doi.org/10.1016/j.jclepro.2015.06.029.
  • Miller, S., Monteiro, P. J., Horvath, A., and Ostertag, C.P. “Reduction in Green House Gas Emission of Concrete using age as a design factor”, Environmental Research Letter, 2015, Vol. 10, 114017

3) Light-weight Multi-functional Façade Systems for energy efficient buildings

  • Shao, Y., Parks, A., Ostertag, C.P., “Lightweight concrete façade with multiple air gaps for sustainable and energy-efficient buildings in Singapore”, Building and Environment, 223, 2022, 109463. https://doi.org/10.1016/j.buildenv.2022.109463
  • Maier, M., Salazar, B., Aghdasi, P., Unluer, C., Taylor, H., Ostertag, C.P., “Thermal and mechanical performance of a novel 3D printed lattice macro-encapsulation method for phase change materials”, Journal of Building Engineering43 (2021), 103124. 
  • Hay, R., and Ostertag, C.P., "Life cycle assessment of double-skin façade (DSF) system produced with fiber-reinforced concrete for sustainable and energy-efficient buildings in the tropics," Building & Environment, June 2018, Vol. 142, pp. 327-341. 
  • Hay, R., Ostertag, C.P. "Development and Application of High Performance Green Hybrid Fiber-Reinforced Concrete (HP-G-HyFRC) for Sustainable and Energy-Efficient Buildings", Key Engineering Materials, 2014, Vols. 629-630, pp. 299-305.

4) Development of our High Performance HyFRC composite/UHPFRC composites; Interactions of reinforcing bars with various HPFRCCs (including HyFRC, ECC) & UHPFRCs; Structural performance enhancement with HyFRC/ UHPFRC; 

  • Shao, Y., and Ostertag, C.P., “Carbon Footprint between Steel-reinforced Concrete and UHPC beams, J. Struct. Eng., 149 (3), (2023) 06023001. https://doi.org/10.1061/JSENDH.STENG-11449
  • Shao, Y., and Ostertag, C.P., “Bond-slip behavior of steel reinforced UHPC under flexure: Experiment and prediction” Cement and Concrete Composites, 133 (2022) 104734. https://doi.org/10.1016/j.cemconcomp.2022.104724
  • Williams, I., Arteta, C., Shao, Y., Ostertag, C.P., “Hybrid Fiber reinforced Concrete Special Shear Wall Boundary Element in Compression”, Engineering Structures,  252 (2022) 113726 https://doi.org/10.1016/j.engstruct.2021.113726
  • Shao, Yi, Nguyen, W., Bandelt, M., Ostertag, C.P., Billington, S., “Seismic Performance of High-performance Fiber-reinforced Cement-based Composite (HPFRCC) Structural Members: A Review,” Journal of Structural Engineering., 148 (2022) 03122004 https://doi.org/10.1061/(ASCE)ST.1943-541X.0003428 
  • Lin, A., and Ostertag, C.P., “Interaction between High Performance Fiber reinforced Cement-based composites and Steel Reinforcement”, Engineering Structures, 247, (2021), 113173. https://doi.org/10.1016/j.engstruct.2021.113173
  • Aghdasi, P. and Ostertag, C.P., “Tensile fracture characteristics of Green Ultra-High Performance Fiber-Reinforced Concrete (G-UHP-FRC) with longitudinal steel reinforcement” Cement and Concrete Composites, 2020, Vol. 114, 103749. https://doi.org/10.1016/j.cemconcomp.2020.103749
  • Nguyen, W., M.J. Bandelt, W. Trono, , S.L. Billington, and C.P. Ostertag, “Mechanics and failure characteristics of hybrid fiber-reinforced concrete (HyFRC) composites with longitudinal steel reinforcement”, Engineering Structures, 2019, Vol. 183, pp. 247-254.  https://doi.org/10.1016/j.engstruct.2018.12.087
  • Afroughsabet, V., A. Lin, C.P. Ostertag, L. Biolzi, G. Geng, and P.M. Monteiro, “The Influence of Expansive Cement on the Mechanical, Physical, and Microstructural Properties of Hybrid-Fiber-Reinforced Concrete,” Cement and Concrete Composites, 2019, Vol. 96, pp. 21-32. https://doi.org/10.1016/j.cemconcomp.2018.11.012
  • Aghdasi, P. and Ostertag, C.P., “Green Ultra-High Performance Fiber-Reinforced Concrete (G-UHP-FRC),” Construction and Building Materials, 2018, Vol. 190, pp. 246-254. 
  • Teng, S., Afroughsabet, V., Ostertag, C., “Flexural behavior and durability properties of high performance hybrid-fiber-reinforced concrete,” Journal of Construction and Building Materials, June 2018, Vol. 182, pp. 504-515. 
  • Chanthabouala, K., Teng, S., Chandra, J., Tan, K.-H. and Ostertag, C.P., “Punching Tests of Double-Hooked-End Fiber Reinforced Concrete Slabs”, ACI Structural Journal, Vol. 115 (6), November 2018; doi: 10.14359/51706891
  • Nguyen, W., Trono, W., and Ostertag, C.P. “Seismic response of a rocking bridge column using a precast hybrid fiber-reinforced concrete (HyFRC) tube,” Composite Structures, Vol. 174, Aug. 2017, pp. 252-262.
  • Jen, G., Trono, W., and Ostertag, C.P., “Self-consolidating HyFRC: Processing, Properties &Applications”, Construction and Building Materials, Feb. 2016, Vol. 104, pp. 63-71. 
  • D. Moreno, W. Trono, G. Jen, C. Ostertag, and S. Billington, “Tension stiffening in Reinforced high performance fiber reinforced cement based composites”, Cement and Concrete Composites, 50, pp. 36-46, 2014
  • W. Trono, G. Jen, M. Pamagiotou, M. Schoettler, and C.P. Ostertag, “Shake-Table Response of a Low-Damage Recentering Post-Tensioned HyFRC Bridge Column”, ASCE  J. of Bridge Eng., 2015. 20 (7): 04014096
  • M. Panagiotou, W. Trono, G. Jen, P. Kumar, C.P. Ostertag, Experimental Response of HyFRC Bridge Columns with Novel Longitudinal Reinforcement Detailing, ASCE J. of Bridge Eng., http://dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000684, 2014
  • J Blunt and C.P. Ostertag, “Deflection Hardening and Workability of Hybrid Fiber Composites”, ACI Mat. J., 106, pp. 265-272, 2009. 
  • J. Blunt and C.P. Ostertag, “A Performance Based Approach for the Design of a Deflection Hardened Hybrid Fiber Reinforced Concrete,” ASCE Journal of Engineering Mechanics, 135, pp. 978-986, 2009. 

5) Effect of multi-scale crack control in HyFRC on Corrosion; Mechanical Approach to Corrosion Mitigation (for additional publications prior to 2016 see CV)

  • Nguyen, W., Duncan, J.F., Devine, T.M., and Ostertag, C.P., “Electrochemical polarization and impedance of reinforced concrete and hybrid fiber-reinforced concrete under cracked matrix conditions” Electrochimica Acta, March 2018, Vol. 271, pp. 319-336. 
  • Will Nguyen, Daniela Martinez Lopez, Gabriel Jen and C. P. Ostertag; "Interaction between global warming potential, durability, and structural properties of fiber-reinforced concrete with high waste materials inclusion" Resources, Conservation & Recycling, 2021, Vol. 169, 105453. https://doi.org/10.1016/j.resconrec.2021.105453
  • Hay, R. and Ostertag, C.P., “Acidification at steel-concrete interface under accelerated corrosion test in chloride environment” Cement and Concrete Composites, 2020, Vol. 110 103573. https://doi.org/10.1016/j.cemconcomp.2020.103573
  • Hay, R. and Ostertag, C.P. “Influence of transverse cracks and interfacial damage on corrosion of steel in concrete with and without fibre hybridization”, Corrosion Science, 2019, Vol. 153, pp. 213-224.   https://doi.org/10.1016/j.corsci.2019.03.020
  • Nguyen, W., Duncan, J.F., Jen, G., and Ostertag, C.P., “Influence of matrix cracking and hybrid fiber reinforcement on the corrosion initiation and propagation behaviors of reinforced concrete”, Corrosion Science, June 2018, Vol. 140, pp. 168-181
  • Nguyen, W., Duncan, J., Monteiro, P.M. and Ostertag, C.P., “Multi-scale Characterization of Corrosion Initiation of Preloaded Hybrid Fiber-Reinforced Concrete Composites”, Key Engineering Materials, 2016, Vol. 711, pp. 195-202. 
  • Jen, G. and Ostertag, C.P., “Experimental Observations of Self-consolidated Hybrid Fiber Reinforced Concrete (SC-HyFRC) on Corrosion Damage Reduction”, Construction and Building Materials, Feb. 2016, Vol. 105, pp. 262-268. 
  • Blunt, J., Jen, G., and Ostertag, C.P., “Enhancing Corrosion Resistance of Reinforced Concrete Structures with Hybrid Fiber Reinforced Concrete,” Corrosion Science2015, Vol. 92, pp. 182-191. 

6) Effect of HyFRC on Alkali-Silica Reaction (ASR); ASR Mitigation (for additional publications prior to 2019, see my CV)

  • Hay, R. and Ostertag, C.P., “New insights into the role of fly ash in mitigating alkali-silica reaction (ASR) in concrete”, Cement and Concrete Research, 2021, Vol. 144, 106440.     https://doi.org/10.1016/j.cemconres.2021.106440
  • Hay, R. and Ostertag, C.P., “On the utilization and mechanisms of waste aluminium in mitigating alkali-silica reaction in concrete”, Journal of Cleaner Production, 2019, Vol 212, pp. 864-879. https://doi.org/10.1016/j.jclepro.2018.11.288
  • Jen, G., Hay, R., and Ostertag, C.P., “Multi-scale Evaluation of HyFRC Restraint on Alkali Silica Expansion”, Journal of Construction and Building Materials, 2019, Vol. 211, pp. 1117-1126. https://doi.org/10.1016/j.conbuildmat.2019.03.102

 

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Claudia Ostertag Awarded IAAM Scientist Medal Award

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