Use this 3-part SimpleSpecs™ template to specify cast-in-place concrete paving for use in vehicular and pedestrian areas, with various finishes.
Paving thicknesses and locations and details of expansion and control joints may be indicated on the drawings; coordinate as required.
Reinforcing steel comes in two types:
- – Deformed bars provide an irregular surface that bonds with the concrete, preventing slippage. Bars can be bent to required shape and connected by wire tying or welding.
- – Welded wire mesh uses wires placed in a rectangular pattern and welded at the intersections. This type of reinforcing is commonly used for concrete flatwork.
In climatic conditions where rusting of the reinforcing is anticipated, galvanized or epoxy-coated reinforcing can be used.
The simplest concrete mix includes Portland cement, aggregate, and water. Varying the amount of each ingredient results in changes to compressive strength, slump, and finishing characteristics. Additives also change the concrete’s characteristics.
Concrete must be protected from moisture loss until it obtains its final characteristics, a process called “curing”.
- – Curing compound: A chemical compound is applied to the concrete immediately after placement. This is typically used on slabs and flatwork.
- – Curing paper: A special paper is placed over the concrete immediately after finishing.
- – Wet curing: Concrete is kept moist by wetting with clean water.
Many other concrete finishes are available beyond what is included in this section, including:
- – Exposed aggregate: Specially selected small aggregate is placed in the concrete mix. After placement, the surface is washed with clean water to remove the overlying cement matrix. Alternatively, the aggregate may be “seeded” onto the wet concrete surface and embedded by rolling prior to the concrete set.
- – Surface retarded: A chemical compound that delays the concrete set is applied to the concrete immediately after floating and troweling. After the lower concrete sets and the surface has achieved the desired look, the chemical compound is washed off.
- – Salted: After the concrete is floated and troweled rock salt is broadcast over the surface and allowed to pit the surface to the desired look, then washed off.
- – Sandblasted: Concrete is floated and troweled, then allowed to set. The surface is then sandblasted to a predetermined depth and exposure of aggregate.
- – Patterned or stamped: After the concrete is floated and troweled a pattern is pressed into the surface using mats or tools.
Related SimpleSpecs™ master specifications: