Concrete Cutting Cutter Burlington MA Mass Massachusetts

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The mixing of each concrete batch shall continue not less than one minute after all the materials are in the mixer, during which time the mixer shall rotate at a peripheral speed of about 200 ft. per mm." There is a considerable gain in strength if the mixing is carried on for a longer interval. The 1916 Joint Committee recommended it minutes.� When hand-mixing is authorized by the Engineer it shall be done on a water-tight platform. The cement and flue aggregate shall first be mixed dry until the whole is of a uniform color. The water and coarse aggregate shall then be added and the entire mass turned at least three (3) times, or until a homogeneous mixture of the required consistency is obtained. The re-tempering of concrete or mortar which has partly hardened, that is, remixing with or without additional cement, aggregate, or water, will not be permitted. Before beginning a run of concrete, hardened concrete and foreign materials shall be removed from the inner surfaces of the mixing and conveying equipment. Before depositing concrete debris shall be removed from the space to be occupied by the concrete; forms shall be thoroughly wetted (except in freezing weather), or oiled. Reinforcement shall be thoroughly secured in position and approved by the Engineer. Concrete shall be handled from the mixer to the place of final deposit as rapidly as practicable by methods which prevent the separation or loss of the ingredients. It shall be deposited in the forms as nearly as practicable in its final position to avoid re-handling. It shall be so deposited as to maintain until the completion of the unit, a plastic surface approximately horizontal. Forms for walls or other thin sections of considerable height shall be provided with openings, or other devices, that will permit the concrete to be placed in a manner that will avoid accumulations of hardened concrete on the forms or metal reinforcement. Under no circumstances shall concrete that has partly hardened be deposited in the work. When concrete is conveyed by chute, the plant shall be of such size and design as to insure a practically continuous flow in the chute. The angle of the chute with the horizontal shall be such as to allow the concrete to flow without separation of the ingredients.' The delivery end of the chute shall be as close as possible to the point of deposit. When the operation is intermittent, the spout shall discharge into a hopper. The chute shall be thoroughly flushed with water before and after each run; the water used for this purpose shall be discharged outside the forms. An angle of 27� or one vertical to two horizontal, is the minimum slope which is considered permissible. Chatting through a vertical pipe is satisfactory when the lower end of the pipe is maintained as nearly as practicable, to the surface of deposit and the pipe full. Concrete, during and immediately after depositing, shall be thoroughly compacted by means of suitable tools. For thin walls or inaccessible portions of the forms, where rodding or forking is impracticable, the concrete shall be assisted into place by tapping or hammering the forms opposite the freshly deposited concrete. The concrete shall be thoroughly worked around the reinforcement, and around embedded fixtures, and into the corners of the forms.

Experiment has shown that thorough rodding of laboratory specimens increases their strength as much as 100 percent. Water shall be removed from excavations before concrete is deposited,' unless otherwise directed by the Engineer. Any flow of water into the excavation shall be diverted through proper side-drains to a sump, or be removed by other approved methods which will avoid washing the freshly deposited concrete. Water vent pipes and drains shall be filled by grouting, or otherwise, after the' concrete has thoroughly hardened. Exposed surfaces of concrete shall be protected from premature drying for a period of at least seven (7) days after being deposited.