Jeffrey J. Thomas

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Cement-based materials have complex multi-component, multiscale structures that first form through chemical reaction and then continue to change with time. As with most classes of materials, the porosity of cement paste strongly influences its properties, including strength, shrinkage, creep, permeability and diffusion. Pores in cement paste range in size(More)
A diverse class of viscous materials, which includes familiar materials such concrete, wood, and Kevlar, exhibit surprising, counterintutive properties under internal moisture content fluctuations. In test after test over the past 50 years, the viscosity of these materials is observed to decrease, often dramatically, during wetting and drying. The key(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Cement paste has a complex distribution of pores and molecular-scale spaces.(More)
The Infrastructure Technology Institute develops advanced methods for monitoring infrastructure condition and performance to assist owners and operators with critical decisions concerning structural integrity, renewal, and rehabilitation. Chapter 3 Nanofilm-coated photonic crystal fiber long-period gratings with modal transition for high chemical(More)
A recently published constitutive model for drying of a partially saturated porous material is extended to take into account finite air (gas) pressure as well as finite external load , variables that are absent during simple drying under atmospheric conditions. We further use the result to derive a general form of effective stress in a partially saturated(More)
Anxiety can produce undesired effects in patients recovering from cardiac conditions including coronary artery bypass grafting surgery. Pharmacological, psychological and educational interventions are used to reduce patient anxiety. This study compared the effects on state anxiety of participation in one of two Phase I (in-patient) educational interventions(More)
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