Craig W. Hargis
University of California, Berkeley
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Publication
Featured researches published by Craig W. Hargis.
Materials | 2017
Yeonung Jeong; Craig W. Hargis; Sung-Chul Chun; Juhyuk Moon
This study investigated the hydration characteristics and strength development of calcium sulfoaluminate-belite (CSAB) cements incorporating calcium carbonate (CC) powders with various particle size distributions and different gypsum amounts. In general, the CSAB hydration was accelerated by the CC powder, but the acceleration and resulting strength improvement were more effective with finer CC powder. Regardless of the fineness of the CC powder, it took part in the hydration of CSAB cement, forming hemicarboaluminate and monocarboaluminate phases. These hydration and nucleation effects compensated for the strength reduction from decreased cementing components (i.e., dilution effect) when finer CC powders were used, while they did not overcome the strength reduction when coarser CC powder was used. On the other hand, increasing the amount of gypsum for a given CC content improved the strength. The strength of CSAB cement had a clear inverse relationship with its total pore volume measured by mercury intrusion porosimetry (MIP). Thermodynamic modeling for CSAB cement hydration showed that the use of CC powder increased total volume of solid phases up to 6 wt % at a given amount of gypsum.
Aci Materials Journal | 2013
Craig W. Hargis; Maria C. G. Juenger; Paulo J.M. Monteiro
Alkali-silica reaction (ASR) continues to be a concrete durability problem despite the many physical and chemical mitigation techniques known to successfully prevent it. The research presented herein tested a new method to limit ASR: aggregate passivation. A lithium silicate layer was created on reactive natural siliceous aggregate surfaces by treating the aggregates in a lithium hydroxide solution prior to use. A 4 M LiOH treatment was found to be superior to a 2 M LiOH treatment in producing a lithium silicate passivation layer and in reducing expansion due to ASR. The use of passivated aggregates greatly reduced expansion in accelerated mortar bar tests compared to nonpassivated aggregates and lithium-based admixtures.
Cement and Concrete Research | 2012
Irvin Chen; Craig W. Hargis; Maria C.G. Juenger
Cement and Concrete Research | 2013
Craig W. Hargis; Ana Paula Kirchheim; Paulo J.M. Monteiro; Ellis Gartner
Cement and Concrete Research | 2014
Craig W. Hargis; Antonio Telesca; Paulo J.M. Monteiro
Journal of the American Ceramic Society | 2014
Craig W. Hargis; Juhyuk Moon; Barbara Lothenbach; Frank Winnefeld; Hans-Rudolf Wenk; Paulo J.M. Monteiro
Cement & Concrete Composites | 2017
Craig W. Hargis; Barbara Lothenbach; Christian J. Müller; Frank Winnefeld
Cement & Concrete Composites | 2014
Daniel Hernández-Cruz; Craig W. Hargis; Sungchul Bae; Pierre A. Itty; Cagla Meral; Jolee M. Dominowski; Michael J. Radler; David Kilcoyne; Paulo J.M. Monteiro
Advances in Cement Research | 2017
Natechanok Chitvoranund; Frank Winnefeld; Craig W. Hargis; Sakprayut Sinthupinyo; Barbara Lothenbach
Construction and Building Materials | 2018
Yeonung Jeong; Craig W. Hargis; Sung-Chul Chun; Juhyuk Moon
Collaboration
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Swiss Federal Laboratories for Materials Science and Technology
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