| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of concrete products easily obtaining stripping strength in a short time and improving productivity. SOLUTION: Ready-mixture concrete is prepared by mixing aggregate, cement and water with suitable additives. The ready-mixed concrete is placed into forms to fill them completely. After placing the concrete,and within 45 minutes before increasing viscosity, steam aging is carried out in a thermostatic chamber at 40-55 deg.C by steam for >=3.5 hr. The concrete products are obtained by stripping. The steam aging is practiced immediately after placing, therefore, when air bubbles are expanded by heating of the steam aging, the particles of cement are fluidized, and sufficient stripping strength is obtained in a short time without forming cracks.
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