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When the carbonation front reaches the steel reinforcements (rebar), the pH of the concrete pore water at the steel surface decreases. At a pH value lower than 10.5, the carbon steel is no longuer passivated by an alkaline pH and starts to corrode (general corrosion). A faster diffusion of oxygen (O
Aqion is a hydrochemistry software tool. It bridges the gap between scientific software (such like PhreeqC [1]) and the calculation/handling of "simple" water-related tasks in daily routine practice.
The 16 Divisions of construction, as defined by the Construction Specifications Institute (CSI)'s MasterFormat, is the most widely used standard for organizing specifications and other written information for commercial and institutional building projects in the U.S. and Canada.
Vetrazzo recycled glass countertops were invented in Berkeley in 1996. A materials scientist, Don McPherson, pursuing his PhD combined recycled glass and a cement binder to create a sustainable, polished countertop. The company at that time was known as Counter Productions.
The sorptivity is widely used in characterizing soils and porous construction materials such as brick, stone and concrete. Calculation of the true sorptivity required numerical iterative procedures dependent on soil water content and diffusivity.
This process is often irreversible. Sufficient amount of free calcium ion and a high pH of 12 and above is needed to initiate and maintain the pozzolanic reaction. [2] This is because at a pH of around 12, the solubility of silicon and aluminium ions is high enough to support the pozzolanic reaction.