Construction of geothermal wells that are effectively cemented and durable poses a significant operational challenge. Typically, lost circulation while drilling and cementing can make it seemingly impossible to place a complete column of cement behind casing strings. Incomplete cementation can lead to well failure caused by cyclic temperature loading on the casing that occurs throughout the lif...

Class C fly ash is a coal combustion product normally produced from lignite or subbituminous coal obtained as a result of the power generation process. In recent years, efforts were taken to incorporate self-cementing fly ash into full-depth reclaimed (FDR) asphalt pavements to improve the structural capacity of asphalt pavement base layers. In this study, an existing asphalt pavement in County...

PURPOSE To assess the stiffness of the cement bone composite and the depth and uniformity of cement penetration into the surface of the tibial component during total knee reconstruction in a porcine model. METHODS The effectiveness of 3 protocols were compared: 2 commonly used cementing techniques-finger-packing of cement on the cut surface followed by impaction, and coating of the undersurfa...

Ca3SiO5 and its polymorphic representations are the dominant phase(s) present in ordinary portland cement (OPC). As environmental pressures bracket the production of OPC, there is increasing emphasis on designing newer, more efficient OPC chemistries. While minor impurities in the form of (Al, Fe, Mg) are long understood to have substantial influences on the structure and reactivity of the sili...

O ne of the most critical elements in endodontic treatment is proper tooth isolation. With the exception of teeth that have undergone a traumatic event and remain intact, teeth requiring endodontic treatment fall into one of the following categories: previously restored, carious, fractured or a combination of the three (Figure, A). Before starting endodontic treatment, it is important to remove...

M. A. MOYERS-GONZÁLEZ, I. A. FRIGAARD, O. SCHERZER and T.-P. TSAI 1Département de mathématiques et de statistique, Université de Montréal, CP 6128 succ. Centre-Ville, Montréal, Quebec, Canada H3C 3J7 email: [email protected] 2Department of Mathematics and Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, British Columbia, Cana...

Seven zinc oxide-eugenol cements with compressive strengths from 200 psi to 8,000 psi were used for temporarily cementing completed inlays, crowns, and bridges. The effectiveness of each cement in a variety of clinical situations is presented. Cement of 1,000 psi met the requirements of typical clinical cases most frequently. The cements of compressive strength 200, 400, 600, 2,200, and 3,500 p...

The worldwide production of PCC fly ash is estimated at achieving 800 million tonnes per year in 2010 [1]. European Union regulations aim at developing new technologies focused on the recycling of these large amounts of PCC fly ash into added-value products. The synthesis of geopolymer binders may be a successful alternative, giving rise to low-cost and environmentally friendly materials with c...