Materials you will need: burlap, cardstock, ruler, X-Acto knife, computer, inkjet printer. 1  Measure out your piece of burlap to 8.5 by 11. Use the X-Acto knife to cut it. 2  Repeat with the card stock. 3  Use the masking tape to affix the burlap to the card stock. 4  Make sure your printer settings are set to Heavy Duty.
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.
A minimum temperature is not often specified for the concrete. It is usually in the form of air temperature. As a practical matter, you would like to see the concrete temperature not go below 40F.At about 39F, the density of water decreases and continues to decrease until it freezes. Further, long term performance of concrete with regard to temperature differential is affected.f you have the proper mix design, heated water, protected or heated aggregates and reasonable protection from the elements, the heat of hydration will over-rule the air temperature if the base the concrete is on is not too cold.