Download ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete by ACI Committee 207 PDF

By ACI Committee 207

Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened country that's quite often transported, positioned, and compacte utilizing earth and rockfill development gear. This record contains using RCC in constructions the place measures might be taken to deal with the iteration of warmth from hydration of the cementitious fabrics and attendant quantity switch to reduce cracking. fabric combination proportioning, houses, layout concerns, development, and qc are lined.

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Complex analyses combine very specific determination of conditions to yield more exacting results. As a minimum, designers should consider the daily and monthly ambient temperature fluctuations, the conditions in aggregate production and RCC mixing that lead to an RCC placing temperature, a realistic placing schedule, and realistic material properties. In many cases, the results of a thermal study are key to determining mixture proportions, construction schedule, cooling requirements, and jointing requirements.

Form movement is a concern when placing RCC directly against external forming systems unless it is grout enriched and internally vibrated. 3 RCC and bedding mortar against forms—The addition of bedding mortar between the RCC and against the form surface provides several improvements. It provides a barrier to water that may seep along a lift surface that is inadequately compacted or has accumulated segregated aggregate. The bedding mortar fills voids at the form surface, resulting in a more conventional concrete appearance.

This is termed grout-enriched roller- compacted concrete (GERCC). The practice varies from placing grout on the previous lift and covering with fresh RCC, placing the fresh RCC with the grout on top, or both. The goal is to place a sufficient quantity of high-quality grout to modify the no-slump RCC to a consistency suitable for internal vibrators. This system results in a very good surface appearance with less placement impacts than placing conventional concrete at the face. The freezing-and-thawing resistance of this system is not good, and should only be used in protected areas or temperate climates.

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