Cost effective solutions to strengthen concrete and masonry
Collapse of existing unreinforced concrete and masonry walls is a well know problem in areas of moderate and high seismic activity. Masonry and concrete walls are heavy, brittle, and weak without reinforcement. How is this risk mitigated?
In modern construction, masonry and concrete walls are reinforced with steel bars cast in concrete, or placed in grouted hollow cavities in masonry. Although, seismic loading on unreinforced masonry and concrete walls are a well known problem, soil loading, wind loading, and other loads on these walls can be just as damaging. Existing concrete and masonry walls constructed before the wide-spread use of steel reinforcement are subjected to a wide variety of hazards.
Often there are limited options to strengthen existing unreinforced masonry and concrete walls. SR Contractors, LLC solved this problem. SR Contractors, LLC has developed a method of strengthening using a structural foam adhesive material called SR Foam. SR Foam is specially formulated to provide compression and tensile capacity, and aggressive adhesive properties that allow it to be used to fill masonry cavities to provide tension reinforcement, or adhere an existing masonry or concrete wall to a new reinforced wall. The applications of the SR Foam are specifically developed, tested, evaluated, and designed to solve this problem. SR Foam works exceptionally well for this application.
SR Foam is used to fill the void in hollow clay tile and cavity walls to bond two sides of a matrix to reduce tension forces and act as tension reinforcement. SR Foam has adhesive properties to help make brittle masonry materials such as clay tile act with additional ductility and energy absorption. SR Foam is also used as a bonding material between sheathed reinforcing walls (strong-back walls) and unreinforced masonry and concrete walls. The strong-back wall can be used to support structural forces, while the unreinforced masonry or concrete can be considered as a non-load bearing material.
The use of strong-back walls, typically wood or steel-stud, are often used with discrete mortar joint anchors placed in locations on the wall. The SR Foam does have the advantage that the entire surface of the unreinforced masonry or concrete walls is adhered to the strong-back wall sheathing. This further helps to prevent cracking and damage to the existing wall material.
SR Foam has the added benefit of providing an insulation value, and provides moisture intrusion prevention, and has been used as a Leadership in Energy and Environmental Design (LEED) projects due to its effectiveness as an insulation. SR Foam is a patented system that is only available through SR Contractors, LLC.