A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
METHOD FOR PRODUCING HIGH-STRENGTH PRECAST CONCRETE
To provide a method for producing a high-strength precast concrete, in which: the stripping time of a frame mold is short; and temperature cracks do not occur easily.SOLUTION: This invention relates to a method for producing a precast concrete using a cement composition obtained by blending a silica fume-mixed cement containing a low-heat Portland cement as a base cement with an accelerating high-range water reducing agent, the method including: placing the concrete in a frame mold; conducting pre-curing treatment at 30-50°C for 6-9 hours to expedite initial setting time for solidification; thereafter raising a curing temperature in a warming gradient of 10-20°C/h; maintaining the temperature at the maximum temperature of 60-90°C for 2-4 hours; and thereafter passing through a temperature history for natural cooling and demolding.SELECTED DRAWING: Figure 1
【課題】高強度プレキャストコンクリートの製造において、型枠の存置期間が短く、また温度ひび割れが生じ難い製造方法を提供する。【解決手段】低熱ポルトランドセメントがベースセメントであるシリカフューム混合セメントに、促進型高性能減水剤を配合したセメント組成物を用いたプレキャストコンクリートの製造方法であって、コンクリートを型枠に打設し、３０〜５０℃で６〜９時間の前養生を行って凝結始発時間を早めた後に、引続き、昇温勾配１０〜２０℃/ｈの割合で養生温度を高め、最高温度６０〜９０℃で２時間〜４時間保持させた後に自然冷却して脱型する温度履歴を経ることを特徴とする高強度プレキャストコンクリートの製造方法。【選択図】図１
METHOD FOR PRODUCING HIGH-STRENGTH PRECAST CONCRETE
To provide a method for producing a high-strength precast concrete, in which: the stripping time of a frame mold is short; and temperature cracks do not occur easily.SOLUTION: This invention relates to a method for producing a precast concrete using a cement composition obtained by blending a silica fume-mixed cement containing a low-heat Portland cement as a base cement with an accelerating high-range water reducing agent, the method including: placing the concrete in a frame mold; conducting pre-curing treatment at 30-50°C for 6-9 hours to expedite initial setting time for solidification; thereafter raising a curing temperature in a warming gradient of 10-20°C/h; maintaining the temperature at the maximum temperature of 60-90°C for 2-4 hours; and thereafter passing through a temperature history for natural cooling and demolding.SELECTED DRAWING: Figure 1
【課題】高強度プレキャストコンクリートの製造において、型枠の存置期間が短く、また温度ひび割れが生じ難い製造方法を提供する。【解決手段】低熱ポルトランドセメントがベースセメントであるシリカフューム混合セメントに、促進型高性能減水剤を配合したセメント組成物を用いたプレキャストコンクリートの製造方法であって、コンクリートを型枠に打設し、３０〜５０℃で６〜９時間の前養生を行って凝結始発時間を早めた後に、引続き、昇温勾配１０〜２０℃/ｈの割合で養生温度を高め、最高温度６０〜９０℃で２時間〜４時間保持させた後に自然冷却して脱型する温度履歴を経ることを特徴とする高強度プレキャストコンクリートの製造方法。【選択図】図１
METHOD FOR PRODUCING HIGH-STRENGTH PRECAST CONCRETE
高強度プレキャストコンクリートの製造方法
SHIRAHAMA NORIE (author) / KUROIWA YOSHIHITO (author) / KIMURA SHOHEI (author)
2018-11-01
Patent
Electronic Resource
Japanese
METHOD FOR PRODUCING PRECAST CONCRETE MEMBER, AND PRECAST CONCRETE MEMBER
| European Patent Office | 2021
High strength Concrete for Precast Concrete Members
| British Library Online Contents | 1995
High strength Concrete for Precast Concrete Members
| Online Contents | 1995
| European Patent Office | 2023
METHOD FOR PRODUCING PRECAST CONCRETE FLOOR SLAB AND PRECAST CONCRETE FLOOR SLAB
| European Patent Office | 2017