1 liter (1/4 gallon) of gas in other cities. 1  In Accra the price is 39% lower than in Paris. 2  In Bristol the price is 9% higher than in Paris. 3  In Indore the price is 21% lower than in Paris.  In Ramallah the price is 27% higher than in 1  Paris. In Bhubaneswar the price is 24% lower than in Paris.  In Guatemala City the price is 42% lower than in Paris.
The hardening of concrete is a chemical reaction that requires certain conditions and temperatures. Ideally, concrete should be poured when the air temperature is between 50 and 90 degrees Fahrenheit. Cold temperatures slow the concrete-setting process, and when temperatures dip below freezing, the delay allows the water in the mix to freeze before the concrete hardens. This creates cracks in the concrete because water expands as it freezes.
Here's how to get a solid, frost-proof footing: 1  When you pour concrete footings, hold the cardboard concrete form tube about 12 in. 2  Flare the sides on concrete footings so the footings will resist heave in harsh winters when frost penetrates especially deep.