Original Assignee Builders Concrete Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Sluys Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/063,762 Inventor Wesley W. Google Patents Lightweight concrete marine float and method of constructing sameĭownload PDF Info Publication number US4318361A US4318361A US06/063,762 US6376279A US4318361A US 4318361 A US4318361 A US 4318361A US 6376279 A US6376279 A US 6376279A US 4318361 A US4318361 A US 4318361A Authority US United States Prior art keywords float aggregate concrete concrete deck core Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4318361A - Lightweight concrete marine float and method of constructing same A slip-resistant surface can be produced by brooming before the concrete has thoroughly hardened, but it should be sufficiently hard to retain the scoring impression.US4318361A - Lightweight concrete marine float and method of constructing same Troweling should not be done on a surface that has not been floated troweling after only bullfloating is not an adequate finish procedure. ![]() Where a smooth, hard, dense surface is desired, floating should be followed by steel troweling. This embeds aggregate particles just beneath the surface removes slight imperfections, humps, and voids and compacts the mortar at the surface in preparation for additional finishing operations. Sawcut joints can be made after the concrete is sufficiently hard or strong enough to prevent raveling.Īfter the jointing the concrete, it should be floated with a wood or metal hand float or with a finishing machine using float blades. Contraction joints are made with a hand groover or by inserting strips of plastic, wood, metal, or preformed joint material into the unhardened concrete. Jointing is required to eliminate unsightly random cracks. This looks like a long-handled straight edge pulled across the concrete. A straight edge is moved across the concrete with a sawing motion and advanced forward a short distance with each movement.īullfloating eliminates high and low spots and embeds large aggregate particles immediately after strikeoff. Screeding or strikeoff is the process of cutting off excess concrete to bring the top surface of the slab to proper grade. Some surfaces may require only strikeoff and screeding to proper contour and elevation, while for other surfaces a broomed, floated, or troweled finish may be specified. Options include various colors and textures, such as exposed aggregate or a patterned-stamped surface. Slabs can be finished in many ways, depending on the intended service use. FinishingĬoncrete that will be visible, such as driveways, highways, or patios, often needs finishing. When concrete is vibrated, the internal friction between the aggregate particles is temporarily destroyed and the concrete behaves like a liquid it settles in the forms under the action of gravity and the large entrapped air voids rise more easily to the surface. Vibration, either internal or external, is the most widely used method for consolidating concrete. Consolidation compacts fresh concrete to mold it within the forms and around embedded items and reinforcement and to eliminate stone pockets, honeycomb, and entrapped air. ![]() In some types of construction, the concrete is placed in forms, and then consolidated. Do not dump the concrete in separate piles and then level and work them together nor should it be deposited in large piles and moved horizontally into final position. In slab construction, placing should be started along the perimeter at one end of the work with each batch placed against previously dispatched concrete. Concrete should not be deposited more rapidly than it can be spread, struck off, consolidated, and bullfloated and deposited continuously as near as possible to its final position. Mixing, transporting, and handling of concrete should be carefully coordinated with placing and finishing operations.
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