ACI 301M-10 Specifications for Structural Concrete.
Contractor- the person, firm, or entity under contract for construction of the Work. design reference sample- sample of precast concrete color, finish, and texture that is submitted for initial verification of design intent. duct- the material creating a conduit in a concrete member to accommodate the prestressing steel of a post- tensioning tendon. equivalent diameter of bundle- the diameter of a circle having an area equal to the sum of the bar areas in a bundle of reinforcing bars. expansive cement- a cement that, when mixed with water, produces a paste that, after setting, tends to increase in volume and is used to compensate for volume decrease due to shrinkage or to induce tensile stress in reinforcement. exposed to view- portion of structure that can be observed by the public during normal use. high-early-strength concrete- concrete that, through the use of additional cement, high-early-strength cement, or admixtures, has accelerated early-age strength development. jack clearance- minimum space required to safely install, operate, and remove a hydraulic jack through its full range of movement in stressing of a tendon. licensed design engineer- an individual representing the Contractor who is licensed to practice engineering as defined by the statutory requirements of the professional licensing laws of the state or jurisdiction in which the project is to be constructed. .
lightweight concrete- structural concrete containing lightweight aggregate conforming to ASTM C330 and having an equilibrium density, as determined by ASTM C567, between 1440 and 1840 kg/m’. mass concrete- -any volume of structural concrete in which a combination of dimensions of the member being cast, the boundary conditions, the characteristics of the concrete mixture, and the ambient conditions can lead to undesirable thermal stresses, cracking, deleterious chemical reactions, or reduction in the long-term strength as a result of elevated concrete temperature due to heat from hydration. normalweight concrete- -structural concrete containing aggregate that conforms to ASTM C33 and that typically has a density between 2160 and 2560 kg/m’. Owner- the corporation， association， partnership, individual, public body, or authority for whom the Work is constructed. permitted- accepted by or acceptable to Architect/ Engineer; usually pertains to a request by Contractor, or when specified in Contract Documents. post-tensioning- a method of prestressing reinforced concrete in which tendons are tensioned after the concrete has attained a specified minimum in-place strength or a specified minimum age. precast concrete- concrete cast elsewhere than its final position. prestressed concrete- -structural concrete in which internal stresses have been introduced to reduce potential tensile stresses in concrete resulting from loads (see post- tensioning and pretensioning).ACI 301M pdf download.