Common use of Form Work Clause in Contracts

Form Work. A. Form work shall conform to ACI 301, Chapter 4, and all special requirements shown on the Drawings. The strength and adequacy of form work shall be solely the responsibility of the Contractor. 1. External corners of exposed concrete shall be chamfered by moldings placed in the forms. 2. Forms shall be removed in a manner to ensure complete safety of the structure. Shoring, posts or uprights shall not be removed until the supported member has acquired sufficient strength to support safely its own weight and all loads upon it, including loads during construction. 3.01 PLACING CONCRETE A. Placing of concrete shall conform with ACI 301, Chapter 8, and any special requirements shown on the Drawings. In all cases, the Contractor shall give the Engineer at least 24 hours notice of intended concrete placement and no placement shall begin until the Engineer has approved the condition of the foundations, forms, reinforcement, and embedded items. At least 48 hours shall elapse between placing of adjoining units. 1. When no moisture barrier is required, the subgrade shall be thoroughly wetted a sufficient time in advance of the placing of the concrete to ensure that there will be no puddles or pockets of mud when the concrete is placed. 2. Earth foundation upon which concrete is to be placed shall be clean free from frost, ice, and standing or running water. Prior to placing concrete, the earth foundation shall have been satisfactorily graded and compacted as required under Earthwork. 3. Before depositing new concrete on concrete that has set, the surfaces of the set concrete shall be thoroughly roughened and cleaned of laitance, foreign matter and loose particles. The set concrete shall be saturated with water and, after free or glistening water disappears, the surface of the set concrete shall be slushed with a coat of grout. The grout shall be well scrubbed in by means of stiff brushes wherever possible. No concrete shall be placed before the grout coat has attained initial set. Grout shall consist of one part cement and one part sand with only a sufficient amount of water to provide suitable workability. Alternately, a thin neat cement grout may be substituted as approved by the Engineer. a. When the surface of old concrete is inaccessible, the grout shall be placed in such a way that it will be spread over the entire surface as the concrete is deposited. b. Epoxy resin grout or mortar shall be used in strict accordance with the directions of the approved manufacturer. c. Concrete bonding agent shall be used in strict accordance with the directions of the approved manufacturer.