Page - 1178 - in Book of Full Papers - Symposium Hydro Engineering

funnel into the water in the beakers directly. The water-cement ratio and mix are almost identity, while only the flocculant added in non-dispersible mortar. The mortar in case (a) and case (c) are same, but UPA added prior to the pouring of mortar in case (c). The demo shows that the water in case (c) remain very lucid. Much less cement in the water in case (b) than case (a). It is clear that the performance of SPU mortar is better than that of non-dispersible mortar, and the performance of the later is better than that of ordinary mortar. Fig. 1 Demo of three technologies 2.3. IMPLEMENTATION PROCEDURE OF SPUC The usage of UPA will simplify the construction of underwater concrete. When SPUC employed, the UPA will be poured into the water body where the concrete is poured later. Then SPUC can be vibration-free casted. The construction procedure is shown in Fig. 2. UPA should be diluted to about 1% before casted into the water to form a 100 ppm UPA solution. After a certain amount of UPA is casted, concrete will be poured at the vicinity of casting point of UPA. At the same time, UPA casting-speed will be control with the speed of concrete pouring. The process will not stop until all workspace filled with SPUC. 3. IN-SITU TEST OF SPUC 3.1 TANJIANG BRIDGE IN-SITU TEST OF SPUC (a) ordinary mortar (b) non-dispersible mortar (c) SPU mortar 1178