| 摘要 |
<p>When casting in particular elongated, hollow, thin-walled concrete objects, such as concrete posts, concrete is pumped into a form (5) and held under pressure therein by closing a valve means (8) while the concrete hardens in the form. The formation of microcracks in the hardened concrete can be avoided and the hardening or curing process of the concrete can be accelerated by supplying hot air through respective perforated pipes (21, 13) immediately subsequent to filling the form with concrete.</p> |
