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[中國新聞] 【公路凍到要冚電氈?】

【公路凍到要冚電氈?】
【工人:怕凍傷路面】
河南鄭州一條興建中的公路,鋪了幾千張電氈,場面壯觀。
忙於接駁電線的工人表示,因為這條公路剛剛灌了混凝土,怕天氣太凍會把路凍壞,於是在兩公里長的路面上,鋪了幾千張電熱氈。

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Time is money, if you can't wait, you've got to do what you needed to so

When concrete is being placed below 5 degrees but is not below freezing point, concrete will take longer to develop the required strength. Note that removing formwork when concrete is too cold or hasn’t reached desired strength, could damage concrete strength and surfaces and concrete might collapse. Using frost blankets and insulated formwork could be necessary to protect concrete. Insulated forms or temporary covers could provide sufficient insulation in beams, columns, and walls.


https://www.thebalancesmb.com/ho ... cold-weather-845021
First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force.

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