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What is the Best Construction Adhesive?

Posted by Pedram Mojarrad on

Construction adhesive is a usually general-purpose adhesive used for attaching drywall, tile, molding, and fixtures to walls, ceilings, and floors. It is most commonly available in tubes intended for use with a caulking gun. There are multiple chemistry for construction adhesives. Different manufacturers use different recipes, but common ingredients include clay, cement, acrylic resin, polyurethane monomers, styrene-butadiene rubber, hexane and other non-polar solvents, and various initiators and functional additives. Polyurethane adhesives bond a major variety of surfaces. They bond to textile fibers, metals, plastics, glass, sand, ceramics, rubber, and more importantly wood. Polyurethane is a multipurpose glue that comes in one part and two part options. Polyurethanes can work very well on a wide variety of wood...

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EPOXY COATINGS ON CONCRETE- DECORATIVE & PROTECTIVE

Posted by Pedram Mojarrad on

Epoxy flooring is most commonly used to coat concrete floors in commercial buildings, industrial and residential garages.  It is a coating system that is comprised of two materials (parts). When the parts are mixed together, they turn into a substance that hardens quickly. This is a semi-gloss or high-gloss durable flooring surface. Epoxy floors can, however, fade or turn yellow in direct sunlight. Epoxy coating material can be used on cement mortars, concrete, wood, or metal surfaces. It can also be used as an undercoat. Before the mixture dries completely, paint flakes can be used to create designs or give...

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Protecting Reinforcement Bars in Concrete

Posted by Pedram Mojarrad on

Reinforcement bars are actually very safe, when completely covered by concrete. The pH of concrete is perfect for the reinforcement steel, so, as long as this pH has not dropped to lower numbers, or the concrete has not cracked or ... the steel bars will stay safe and sound in the concrete. But as you can tell, this may not last very long, specially in very corrosive areas, or when a concrete has cracked (due to plastic or drying shrinkage or structural reasons). Chloride induced corrosion is a big deal in coastal areas (like all capital cities in Australia).    To cut the long...

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Cracks on concrete balconies- Where did they come from?

Posted by Pedram Mojarrad on

Late last year, GESS were engaged in forensic studies and then repair of balconies (8 of them) in a residential buildings in Sydney- Northern Beaches.There types of cracks were quite obvious: 1- Side cracks; which we figured out to be due to chloride attack, and2- Flexural cracks (soffit of slab); which are structural cracks.     Reinforcement corrosion has become a serious, widespread problem worldwide, with costly repair methods. The steel corrosion in reinforced concrete reduces its durability and can even result in failure of the structure. Corrosion is a phenomenon which results in the deterioration or destruction of a material when...

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Acid Resistant Solution

Posted by Pedram Mojarrad on

How can we protect concrete against acids, specifically those strong ones?

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