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.
Concrete should not be exposed to temperatures 20ÂºF above the minimum placement temperatures. ACI 306R-88 Chpt 7.4 11. The temperature of the concrete and the ambient air and recorded at least twice in 24 hr period. Temperatures should be taken at more than one location, on edges and corners. 12. mix. APWA 03 30 04 2.5 E1 4. Non chloride admixtures may be used but placement, curing and protection requirements must be observed. APWA 03 30 10 3.4 A2 5. Temperature of concrete as placed should be as close to the minimum recommended value as possible (55Âº F) ACI 306R-88 Chpt 3.1 6.