Phoscrete is an easy-to-use, fast-setting, long-lasting Magnesium-Alumina-Liquid-Phosphate (MALP) concrete repair material for repairs in extreme environments (-15°F to +115°F). Instead of water, Phoscrete’s pre-extended dry component mixes include Liquid Phosphate Activator (Freezing Point = -20°F). Working time and set time are easily controlled by supercooling the activator in hot temperatures, and by adding fast-set admixtures in cold temperatures. The presentation will include laboratory testing, field installation, and a small installation.
This demonstration will introduce the WJE CASLE™ (Corrosion Assessment Service Life Evaluation) software for predicting corrosion-related damage in reinforced concrete structures. This tool helps engineers more effectively quantify remaining service life and guide repair decisions for existing structures, as well as evaluate protection/durability design strategies for new structures. Developed in-house by WJE’s materials engineers for WJE structural assessment projects, WJE CASLE™ offers full control of the evaluation process and facilitates a customizable approach to construction parameters and exposure conditions unique to each project. Advantages of the software include consideration of site-specific conditions such as construction geometry, sealers, coatings, corrosion-resistant reinforcing, presence/installation of overlays, existing chloride profiles, concrete cracking, and two-sided exposure. Model features will be outlined with a focus on evaluation of existing structures.
In this presentation, we will address the effect that corrosion has on our concrete infrastructure, including buildings, bridges, sea walls, cooling towers, docks, and many other reinforced concrete structures.
From the days of boiled Linseed oil, to the discovery of membrane forming cures, to the development of carbon dioxide injection; curing has evolved to accommodate the demands of the construction industry. This presentation will look back at the early standards developed by ASTM, contrasting them to the standards that are currently under consideration. There are many ways to cure concrete, this presentation will review the various product options framed in the context of weather. Lastly, the presentation will explore the various methods discussing the features and benefits of the common curing practices of today.
Dallas City Hall and Plaza are recognized by many due to the opening scenes of Dallas, the television show. What is less known is that the structure is a significant early example of bonded post-tensioned concrete which was utilized throughout the superstructure and two-story parking garage constructed beneath the plaza. Opened in 1977, the parking garage is a two-way bonded post-tensioned concrete slab with unreinforced drop panels supported by flared circular concrete columns. The garage covers two city blocks, extends under two adjacent multi-lane streets, and supports mature landscaping, pool, fountain, and up to 11’-0” of soil. In 2017, several square feet of a drop panel fell from the structure and subsequent observations found multiple locations of drop panel and column capital failures. A structural investigation including destructive and non-destructive testing, and analysis of the existing structure was undertaken to determine the cause of the failures.
In this presentation, industry expert David Whitmore will explain how various factors govern the service life of zinc based cathodic protection systems and how we can achieve accurate service life designs.
The demonstration will cover the basic steps, products, and processes involved with dying and polishing concrete. The equipment, tooling, chemicals, and processes used to achieve a polished floor will be demonstrated.