Bond strength and the relative weathering rates of simple orthosilicates

Bond Strength and the Relative Weathering Rates of Simple Orthosilicates

Common naturally occurring orthosilicates can be grouped into those in which the major non-tetrahedral cations are (1) FeII and/or Mg, plus or minus Al (olivine, pyralspite garnets, staurolite); (2) Al (Al2SiO5 polymorphs), or (3) Zr. Feand Mg-bearing orthosilicates have the weakest bonds between non-tetrahedral cations and structural oxygen (M-O bonds), and zircon the strongest, with Al-O bond...

Modeling relative frost weathering rates at geomorphic scales

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

Relative strength of hydrogen bond interaction in alcohol–water complexes

Hydrogen binding energies are calculated for the different isomers of 1:1 complexes of methanol, ethanol and water using ab initio methods from MP2 to CCSD(T). Zero-point energy vibration and counterpoise corrections are considered and electron correlation effects are analyzed. In methanol–water and ethanol–water the most stable heterodimer is the one where the water plays the role of proton do...

A simple, do-it-yourself method to evaluate bond strength

A direct-bonding bracket exhibiting the best features is useless if just one is missing: an acceptable bond strength. As a result, over a hundred articles related to its testing were published till 1997 only in the American J. of Orthodontics and Dentofac Orthop. Current debonding methods [1] include all the known types of force application (Figure 1). A simple, do-it-yourself method to evaluat...