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Materials

Concrete / cement

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Displaying 126 - 150 of 291

Modeling and Measuring Chloride Ingress into Cracked Mortar

August 7, 2016
Author(s)
Scott Jones, Jeffery Davis, John L. Molloy, John R. Sieber, Dale P. Bentz
Chloride ingress into reinforced concrete structures is responsible for initiating corrosion of steel embedded into concrete. To aide in the prediction of concrete service life, a chloride ingress model that includes chloride binding to the cement matrix

Direct Measurements of 3D Structure, Chemistry, and Mass Density During the Induction Period of C3S Hydration

July 27, 2016
Author(s)
Qinang Hu, Mohammed Aboustait, Taehwan Kim, Tyler Ley, Jeffrey W. Bullard, Jay C. Hanan, Volker Rose, Robert Winarski
The reasons for the start and end of the induction period remain a mystery in cement hydration. One long-standing hypothesis is the importance of early hydration products on the surface of cement particles. However, because this material is not widely

Direct Three-Dimensional Observation of the Microstructure and Chemistry of C3S Hydration

July 14, 2016
Author(s)
Qinang Hu, Mohammed Aboustait, Taehwan Kim, Tyler Ley, Jay C. Hanan, Jeffrey W. Bullard, Robert Winarski, Volker Rose
While portland cement has been widely studied for over 100 years, there are still widespread disagreements on the mechanisms of hydration. One reason for this is that direct observation of the change in microstructure and chemistry are challenging for many

Advances in shape measurement in the digital world

March 22, 2016
Author(s)
Edward Garboczi, Xiaodong Jia
The importance of particle shape in affecting the behaviour of powders and other particulate systems has long been recognised, but until fairly recently particle shape information has been rather difficult to obtain and use compared to its more well-known

The Influence of Water Activity on the Hydration Rates of Triclinic Tricalcium Silicate

January 20, 2016
Author(s)
Tandre Oey, Aditya Kumar, Gabriel Falzone, Jian Huang, Sierra Kennison, Mathieu Bauchy, Narayanan Neithalath, Jeffrey W. Bullard, Gaurav Sant
Tricalcium silicate stops hydrating at relative humidities (RH) less than 80 %. But the rate at which its hydration rate decreases as a function of the RH has not yet been elucidated. By invoking correspondence between RH and water activity (aH, unitless)

Effect of a micro-copolymer addition on the thermal conductivity of fly ash mortars

November 5, 2015
Author(s)
Alejandro Duran-Herrera, Joana K. Campos-Dimas, P Valdez, Dale P. Bentz
In this study, a copolymer composed of hollow spherical particles with an average particle size of 90 µm was evaluated as a lightweight aggregate in Portland cement-fly ash mortars to improve the thermal conductivity (k) of the composite. Mortars were

Numerical Simulation of Heat and Mass Transport during Hydration of Portland Cement Mortar in Semi-adiabatic and Steam Curing Conditions

October 22, 2015
Author(s)
Emilio Hernandez-Bautista, Dale P. Bentz, Sadoth Sandoval-Torres, Prisciiano Cano Barrita
The mass and heat transport during steam curing of concrete has a bearing on both the mechanical and durability properties. Therefore, it is essential to take into account the temperature evolution and the moisture distribution to prevent premature damage

Microstructural Origins of Cement Paste Degradation by External Sulfate Attack

October 15, 2015
Author(s)
Pan Feng, Edward Garboczi, Pan Feng, Jeffrey W. Bullard
A microstructure model has been applied to simulate near-surface degradation of portland cement paste in contact with a sodium sulfate solution. This new model uses thermodynamic equilibrium calculations to guide both compositional and microstructure