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Sustainability Table 2: Test results Criteria Method Control Sustainable ACI 506.5R ACI 506.5R mixture mixture minimum16 maximum16 Water content to cementitious ratio U. Laval 0.33 0.52 0.35 0.45 In-place cementitious (%, mass) U. Laval 37.1 31.8 — — Average air flow, ft3/min (m3/min) U. Laval 195.9 (5.55) 135.8 (3.85) — — PERFORMANCE CRITERIA Compressive strength at : 3 days, psi (MPa) ASTM 2495 (17.2) 1697 (11.7) 2176 (15) — C160414 7 days, psi (MPa) ASTM 4235 (29.2) 2698 (18.6) 4351 (30) — C160414 28 days, psi (MPa) ASTM 5656 (39.0) 4569 (31.5) 5802 (40) — C160414 Hardened density, lb/yd3 (kg/m3) U. Laval 3600 (2136) 3327 (1974) — — Rebound (%, mass) U. Laval 34.7 14.8 10* 30* DURABILITY CRITERIA Boiled absorption (%) ASTM 10.26 15.45 — 8† C64215 Volume permeable voids (%) ASTM 20.20 26.69 — 17† C64215 Chloride permeability (coulombs) ASTM 1032 1843 — — C120217 *Rebound limits defined in ACI 506R, Table 8.1.13 †These limits are for normalweight aggregates and may not apply to lightweight aggregates, such as slag aggregates. Note: Bold results do not conform to ACI 506.5R, “Guide for Specifying Underground Shotcrete,” criteria.16 Shotcrete • Fall 2013 35


2013FallShotcreteEMag
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