Class A finishes are general for exposed walls where finish is critical for appearance purposes, however, a more broadly specified area where you will typically see Class A finish requirements is in the wastewater treatment area. Not because of its appearance but because of its ease of use. When the concrete has hardened sufficiently, the U1 finish will be driftwood to give a uniform surface free of tamping marks. The use of concrete maturity measurement tools, such as Doka's Concremote, allows the contractor to see what level of maturity the concrete has reached within the formwork, with real-time information sent from the sensors to the user over the mobile phone network.
The Concrete Center also states that a high percentage of cement replacement affects early strength gain. Because ACI 301-10 specifies the size of acceptable surface voids or, more specifically, the size of voids to be repaired, concrete contractors must be able to avoid costly disputes and unexpected repairs. Maturity can be affected by many different factors, some of which include the method chosen, ambient temperature, weather conditions, mold release agent, and concrete mix, among other factors. It is important to define the concrete mix when considering the required finish, since visually appealing concrete requires a slightly different “recipe”.
It is essential that the formwork is robust and well constructed and that it does not deviate too much during concreting. Concrete containing honeycombs, significant ventilation holes or similar defects will be cut and replaced according to instructions. For gradual irregularities, the space between the concrete surface and a 5-foot straight edge is measured between the contact points. As mentioned on our website “8 Tips for High-Quality Architectural Concrete”, we recommend selecting the most suitable formwork system for the project, as the formwork system plays an important role in finishing concrete.
The National Structural Concrete Specification (NSCS) has the same scope as BS EN 13670 for building structures and the NSCS covers the requirements for the construction of concrete building structures, including on-site concrete, among others. Contractors must use the same release and application method, the same concrete placement and consolidation techniques, formwork removal times, and the same curing method planned for the project. The arrangement of the shape ties and the footprint made by the panels in the joints between panels will later appear on the surface, modeling the visible part of the concrete. A high quality special concrete finish was required where no ties were allowed on existing brick pillars.
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