| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a high-strength hume pipe in which a compressive strength becomes at least 100 N/mm<SP POS="POST">2</SP>without using a sludge reducer and without lowering a high speed centrifugation G. <P>SOLUTION: The manufacturing method of the high-strength centrifugal molding concrete pipe in which a concrete pipe is formed by performing centrifugation forming is characterized in that a total powder weight consisting of cement or the cement and a particulate admixture is at least 650 kg/m<SP POS="POST">3</SP>, the water ratio (water to powder ratio) to the total powder weight is at most 21% (% by weight same as follows), the ratio of a fine aggregate volume (fine aggregate ratio s/a) to a total aggregate is at most 45%, a paste fine aggregate ratio α showing the filling ratio of a cement paste to a fine aggregate void is 2.0<α<3.0, a mortar coarse aggregate ratio β showing the filling ratio of a mortar to a coarse aggregate void is 2.5<β<3.6, and the addition amount of a water reducing agent is adjusted, thereby a slump flow value is made 400 mm-800 mm, and a 50 cm slump flow time is made at least 15 seconds. <P>COPYRIGHT: (C)2013,JPO&INPIT |
