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.
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 covers MiraGard Granite, a water-based dual component, self-crosslinking acrylic resin binder specifically designed for use as a decorative vinyl flake broadcast system to simulate the depth and texture of natural granite stone. The product is moisture vapor permeable and can be used as a beautiful decorative topcoat over new concrete or existing concrete needing repairs whether exterior, interior, slabs-on-grade or elevated slabs. It is also rapid curing and can be completed in one day with fast return to service typically in as little as only 24 hours, and offers outstanding durability and wear resistance, UV stable for superior color retention and weathering resistance, good resistance to moisture absorption, environmentally friendly and VOC compliant and water-based for easy clean-up.
Repairing and extending the service life of concrete in severe environments first requires that one understands what may be considered severe why it may be considered so. This presentation will discuss the ways in which different organizations and technical committees around the world define ‘severe environments’ for concrete structures; types of deterioration mechanisms and materials-related distress that may severely and quickly deteriorate concrete, type of structures with potentially severe environments, and U.S. geographical considerations.
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.
The case-histories based presentation will focus on the use of nondestructive evaluation (NDE) methods to detect flaws and damage in concrete construction. Case histories will be presented for detection and mapping of flaws and damage in concrete such as cracking, delamination, honeycomb, void, corrosion, fire damage, alkali-silica reaction and low strength concrete. The case histories for the concrete structures are anticipated to include parking structures, bridges, buildings and dams. NDE methods will include sonic/ultrasonic, infrared thermography, radar and corrosion technologies where the results in many cases were confirmed by coring. The use of some of the NDE methods for QA of concrete repairs such as epoxy injection and patching will also be discussed.
Proper installation of the RFP and Mesh system on stucco substrates that have cracking issues will be demonstrated. This involves application of the product with embedded mesh. Also shown will be the application of a "Kiss Coat" of material applied over the previous first coat installation. Finally, how to perform a field adhesion test to ensure adequate bond will be demonstrated. The product, history, benefits and procedures for a successful application and installation will be discussed as well as proper surface preparation and how weather conditions can affect the installation. Demonstration will be hands-on installation on an actual building.
EDCC is an extremely novel and first of its kind application for use primarily in the seismic retrofit of unreinforced masonry walls. This spray-on technology incorporates a highly sustainable and cost-effective mixture of recycled admixtures that have proven to be extremely effective at greatly enhancing the ductility and strength of unreinforced structures. Its ease of placement and unique flexural advantages make it very unique in the field of seismic upgrade with the potential for additional applications with other infrastructure improvements.
How to properly mix, place and finish MG-Krete, a 2-component product and permanent repair material, will be demonstrated. The demonstration will show methodologies employed in horizontal, vertical, overhead and structural repairs using MG-Krete. Participants will learn the chemistry behind the product and the reason why it is a successful permanent repair material. There will be a full technical review of the product benefits.
Shotcrete has been used widely for rehabilitation and retrofit of concrete structures. More and more large infrastructures, in particular, in the hydro power industry, is using shotcrete for major rehabilitation and retrofit. Recently, the US Army Corps of Engineers has been engaged in structural modifications to reinforced concrete draft tube exits from the turbines in the Ice Harbor Lock and Dam located on the Snake River, Washington. This presentation details the structural modification to the draft tube which was successfully completed using wet-mix shotcrete.