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Concrete In Australia : December 2013
34 Concrete in Australia Vol 39 No 4 FEATURE: RHEOLOGY China The concept of LF-SCC was first started in China in 2009 for Asia Pacific. Application example 4 Work summary: • Construction name: major high rise in Shanghai • Construction location: raft foundation of high rise • Design strength of concrete: 50 MPa This was the biggest pour in China using the LF-SCC technology incorporating the unique and versatile viscosity modifying agent in PCE technology executed in a single pour of 60,000 m3 for the raft foundation of the proposed 632 m Figure 10: Placing TVC (left panel) and LF SCC (right panel). Figure11: TVC placed by three persons vs LF SCC by one. Quantitative Impact Qualitative Impact Labour Cost Savings Plant Cost Savings Time Savings Increased Productivity Evironmentally Friendly Improved Safety • No vibrators and accompanying workers. • Less workers required for levelling. • Less plant usage time for tower cranes, concrete pumps and redundancy of vibrators. • Shorter concreting schedules. • Cost savings in labour, plant and shorter time required. • Elimination of noise from vibrators. • Due to lower manpower requirement and less usage of plant and equipment. Table 9: Fresh and hardened concrete results. Table 10: Mix details (all quantities in kg/m3). Water Cement Slag Fly Ash Fine Aggregates Course Aggregates Admixture Dosage (% by weight of cementitious) 160 240 120 80 760 1000 0.9% 7 Day 28 Day 60 Day 90 Day Average strengths (MPa) 39.8 56.9 63.0 66.5 Table 11: Compressive strengths (MPa). Figure 12: Placing LF-SCC for lift walls at Cairnhill Rise (Singapore). 29-35 Kar.indd 34 29-35 Kar.indd 34 25/11/13 2:56 PM 25/11/13 2:56 PM