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

By ACI Committee 207

ISBN-10: 0870312774

ISBN-13: 9780870312779

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

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4 RCC with GERCC against forms—When cement grout is placed in sufficient quantity on the RCC surface along the formed face and the RCC is of sufficient workability, it is possible that the affected area can be consolidated with internal vibrators. 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.

These include substitution of pozzolan for some of the cement, limiting placement of RCC to the season when cool weather is expected, placing at night, lowering the placing temperature, and jointing. When the option is available, selecting an aggregate of low elastic modulus and low coefficient of thermal expansion is helpful. 4R. It is difficult to generalize the cracking performance of a structure. The exposure of relatively thin lifts of RCC during initial hydration may contribute to an increase or decrease in peak temperatures depending on ambient conditions and the length of exposure.

The shear-friction factor (SFF) is a measure of the stability of a dam against sliding. The SFF on a horizontal plane is expressed as SFF = (cA + (N – U)tanφ)/T where c is the unit cohesion; A is the area of cross section; N is the component of confining force normal to the sliding surface; U is the uplift force acting on cross section; φ is the angle of sliding friction; and T is the driving force parallel to the sliding surface. The cohesion component of sliding shear resistance along lift joints is very sensitive to cementitious content and quality, construction quality, rate of placement and set time of the mixture, and lift joint maturity (Schrader 1999).

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


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