This file summarizes presently to be had information regarding excessive energy concrete (HSC). subject matters mentioned comprise choice of fabrics, concrete combination proportions, ordering, batching, blending, transporting, putting, qc, concrete homes, structural layout, financial concerns, and functions.
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Extra info for ACI 363R-10 - Report on High-Strength Concrete
15 was reported to range from 5 to 11°F per 100 lb/yd3 (5 to 10°C per 59 kg/m3) of cementitious material for mixtures with 30 to 32% fly ash replacement. These mixtures had temperature rises from 50 to 110°F (28 to 61°C) in HSC members with the aforementioned surface area-to-volume ratios containing 985 lb/yd3 (581 kg/m3) of cementitious materials (Myers and Carrasquillo 2000). The temperature rise will be affected by the shape and geometry of the structural element, as illustrated in the bridge girder shown in Fig.
The nominal concrete contribution includes, in an undefined way, the contributions of the still-uncracked concrete at the head of a hypothetical diagonal crack, the resistance provided by aggregate interlock along the diagonal crack face, and the dowel resistance provided by the main reinforcing steel. There is general agreement among researchers that ACI 318-05 Eq. (11-3) and the more complex ACI 318-05 Eq. (11-5), shown below as Eq. (7-15) and Eq. 3 f c ′b w d ⎝ Mu ⎠ 7 (fc′ in MPa) are conservative for both normal- and high-strength concrete (Kong and Rangan 1998; Mphonde and Frantz 1984, 1985; Pendyala and Mendis 2000; Russell and Roller 1990).
Some experts (Haque et al. 1992) contend that the fly ash binds a significant amount of the free chloride ions, which can ingress into concrete from the surface. The binding of these chloride ions reduces the amount of free chloride ions that are available to reach the level of the reinforcing steel to initiate corrosion. Other studies (Tikalsky and Carrasquillo 1989) have shown that the use of fly ash increases the concrete permeability at early ages, but improves it at later ages. Fig. 19—Charged passed at 56 days versus w/cm for mixtures with and without fly ash (adapted from Myers ).