設計基準強度200N/mm 超高強度 ... - taisei.co.jp

1 44 (2011) 21-1 200N/mm2 Keywords : design strength of 200 MPa, ultrahigh strength precast concrete, superhigh-rise condominium, steam curing 200N/mm2 1. Fc 150N/mm2 1) 2) 3) Fc200N/mm2 4) 5) Fc200N/mm2 2.

2 Fc200N/mm2 2 42 -1 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 3, 83, 2 42 1 -1 Fig. 1 External view 1 1 44 (2011) 21-2 Fc30 200N/mm2 Fc30 48N/mm2 Fc30N/mm2 Fc200N/mm2 1 2 3 5 40m3 1 2 Fc140N/mm2 420m3 2 -2 -3 Fc80N/mm2 Fc140N/mm2 Fc200N/mm2 RC 3.

3 Fc 200N/mm2 Fc200N/mm2 -1 4) 5) PC Fc200N/mm2 -1 -2 Fig. 2 Framing elevation of substructure -3 2 Fig. 3 Column plan on second underground floor -1 Photo 1 Manufacturing experiments of actual-size columns -1 Fc200N/mm2 Table 1 Materials and mixture proportions of 200 MPa W/B % kg/m3 14 729312150629 620 30 17,300 18,130 16,160 Fc140,200* Fc120* Fc100* * Fc (N/mm2)

4 Fc200 Fc140 1FL B1FL B2FL9,000 57,600 12,200 44,100 Fc 200Fc 140 44 (2011) 21-3 4) 6) 150kg/m3 14% 50% 10kg/m3 13 15% 15 200N/mm2 4 39 13 -4 6 7 13

5 13 -2 -3 02468101214050100150200 A -4 Fig. 4 Typical measurements of the mixer load current measured during mortar mixings -2 Photo 2 Fresh concrete tests -3 Photo 3 Concrete placing in horizontal position 1B2B3B4B5B6B7B8BB 44 (2011)

6 21-4 90 5 C 120 -4 1 2 3 -5 Fc200N/mm2 4. -5 50cm T50 70 80cm -2 T50 10 -4 Photo 4 Precast columns were kept covered with plastic wrap before steam curing at 90 C -5 Photo 5 Erection of precast column ---- (a) 0 10203040556065707580850102030T50 cm : : 0 10203040135140145150155160165 kg/m3 : %.

7 (a) T50 (b) (c) -5 Fig. 5 Results of fresh concrete tests - (a) Slump flow and T50; (b) Air content; and (c) Unit water content 44 (2011) 21-5 35 40 150kg/m3 145 155kg/m3 -6 T50 T50 5cm 5 T50 T50 -7 3 -2 -7 200N/mm2

8 -2 -8 14614815015215455606570758085010203040y = + = + cm kg/m3 T50190 , 195 190195200205210215220225230235010203040 N/mm2 209N/mm2 -2 Table 2 Compressive strength test results by date of mixing (a) average; (b) standard deviation; (c) variation coefficient 1 2 3 4 (a) N/mm2 209 207 209210(b) N/mm2 (c) % -6 T50 Fig.

9 6 Influences of unit water content on slump flow and T50 -7 Fig. 7 Histogram of compressive strength test results 146148150152154140160180200220240y = + N/mm2 kg/m3 = + N/mm2 % = + N/mm2 t/m3 (a) (b) (c) -8 Fig. 8 Relationships between fresh properties and compressive strength of concrete - (a) unit water content; (b) air content; and (c) density of fresh concrete 44 (2011) 21-6 200N/mm2 5.

10 200N/mm2 Fc200N/mm2 ( ) ( ) ( ) ( ) ( ) ( ) ( ) BASF ( ) ( ) ( ) 1) 150N/mm2 1 3 2008 2) Vo l . 4 9 2011 3) Vo l.