PSI - Issue 70

Sidhartha Parida et al. / Procedia Structural Integrity 70 (2025) 335–342

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7.5. V-Funnel flow test The V-funnel test, assesses the flow time of self compacting concrete (SCC). The steel apparatus has a watertight gate and a flat top on vertical supports. The funnel is wetted, filled with SCC, and leveled. After a 10±2 second wait, the gate is opened, and a stopwatch records the flow time. The test ends when clear space appears, and the apparatus is cleaned afterward. Table 9: Fresh properties of developed SCC Mix Mix1 Mix2 Mix3 Recommended values Slump flow mm 605 685 720 650mm – 800mm Slump flow T 500 Sec 6 4.5 4 2sec – 5sec J-ring test 8.75 7 8.50 0sec – 20sec V-funnel test Sec 10 9 7 6sec – 12sec 7.6. Compression test on SCC The compression test on self compacting concrete (SCC) follows IS 516:2024 to determine its compressive strength. Required apparatus includes a compression testing machine (CTM), standard cube molds, and a curing tank. SCC is mixed per design and tested for workability using slump flow, V-funnel, and L-box tests. It is poured into molds without vibration and cured at 27 ± 2°C for 7 and 28 days. Before testing, specimens are dried and loaded in the CTM at 14 N/mm² per minute until failure. Strength is calculated as failure load divided by the cross-sectional area, with SCC exhibiting higher early-age strength. 7.7. Flexural strength on SCC Flexural test of self compacting concrete (SCC) measures its flexural strength, or modulus of rupture, needed for structural behavior. As per IS 516:1959, the test is performed using a two-point system of loading. SCC is cast in standard beam moulds without vibration and is water-cured for 28 days. The beam is tested on rolls of 400mm or 600mm span, loaded to failure. Flexural strength (f r ) is calculated by f r = (P × L) / (b × d²). The test ensures SCC with the specified tensile stress resistance in bending, thereby further expanding its structural applications. 7.8. Splittensile teston SCC Split Tensile Strength Test on Self compacting Concrete (SCC) is in accordance with IS 5816:1999. Compression testing machine of 1000 kN, cylindrical molds of 150 mm × 300 mm, trowel, scoop, tamping rod, and calipers are needed. SCC specimens are cast, water-cured at 27°C ± 2°C for 28 days, surface-dried, and tested horizontally with plywood stripsforuniform distribution of load. The rateof loading for the load is1.2 – 2.4 MPa/min until failure. The tensile strength is determined by the formula T = (2P) / (πDL). The test is utilized to evaluate the tensile properties of SCC, which are critical in the evaluation of structural performance. (a) (b) (c)

Fig 2: (a) Compressive Test; (b) Split Tensile Test; (c) Flexural Test