C-S Sample Clauses

C-S. H atomistic models Hydrated cement is a heterogeneous material in which the main phase is the calcium silicate hydrate (C-S-H) constituting 50 to 70 % of the total volume (Xxxxxxxxxx et al., 2010). We model cement using the C-S-H phase since it is the principal binding phase and thus responsible for most of the mechanical and chemical properties of cement. C-S-H is known to be a poorly ordered material, characterized by layered silicate structure resembling an imperfect tobermorite and/or jennite (Xxxxxxxxxx et al., 2010). The C/S ratio, which varies from 0.7 to 2.1, is one of the most important parameters of the chemical composition of C- S-H (Xxxxxx et al., 2008; Xxxxxxxx et al., 2009), which also characterizes the degree of cement degradation. To build the atomistic C-S-H models, the starting configuration is tobermorite 14 Å crystal with a chemical composition of Ca5Si6O16(OH)2·7H2O (Xxxxxxxxxx et al., 2005); this structure has a C/S ratio of 0.83. The chemistry of tobermorite 14 Å is modified by creating surface defects via removal of charge neutral SiO2 units, as suggested recently Xxxxxxxxx et al. (2017) and by Xxxxx et al. (2017). Once a defect has been introduced, local charge neutrality is satisfied by the addition of H+ and Ca(OH)+. Additional molecular H2O and Ca(OH)2 units are introduced to obtain the desired C/S ratio. The introduction of surface defects was guided by available spectroscopic and diffraction data (Yu et al., 1999; Xxxxxx et al., 2008; Xxxxxxxx et al., 2009; Xxxxxxxxxx et al., 2010) and took into account that silica tetrahedral dimers are the most abundant of all silicate species in C-S-H and linear pentamers are the second most abundant. Water dissociation in contact with reactive C-S-H surface can lead to the formation of additional hydroxyl groups on the surface and protons at the created defect sites. Taking recent DFT calculations of Churakov et al., (2014) as a guide, different schemes of surface protonation should be considered since they can result in the accumulation of different surface charge. Aqueous hydroxyl ions were added to the system to maintain the total electrostatic neutrality of each model. The final C-S-H models investigated in this work have a C/S ratio of 0.83 (defect free), 1.25, 1.5 and 1.75 (Figure 1a). For each system, planar pores of sizes 1-5 nm were created by cleaving the crystal model and gradually increasing the interlayer space along the (002) direction. The pore sizes selected for simulation ...

C-S. A. The finance charge implicit in each leasing installment shall be calculated by dividing the nominal interest rate by the number of installments paid annually, multiplying the result, as a percentage, by the outstanding capital prior to payment of the installment in question, as detailed in Annex 1. For information purposes, the system set forth in Bank of Spain circular no. 8/1990, dated September 7 (published in Official Spanish Gazette no. 226 on 9/20/1990) has been applied to calculate the Annual Percentage Rate (APR) or Annual Equivalent Rate (AER). The Annual Percentage Rate in Annex 1 does not include the effects of any taxes that could favor the Lessee, nor notary public expenses, seals, registration or inscription expenses, nor any other that the Lessor may charge to the Lessee by virtue of the agreements contained herein, except for the study and information fee and the opening fee that figure in said Annex. The Annual Percentage Rate has been calculated on the supposition that the time between any two consecutive lease installments is equal to a payment period, likewise considering the funds necessary to acquire the goods that are the purpose of this Agreement were made available to the supplier on the date the Agreement is entered into.

C-S. The Corporate Seal of INTRAWEST ULC was hereunto affixed in the presence of:By: /s/ [illegible]Title:_____________________________ )))))))) C/S