其中Step 2: buying your materialsConcrete is made by mixing cement, sand, stone, aggregate and water. For small jobs, it’s best to buy pre-mixed concrete in 40kg bags. Then all you do is add water. For larger projects, it’s cheaper to buy the materials separately and mix them yourself. Cement is normally sold in 40kg bags. Sand and aggregate are both sold by the cubic metre or fractions of a metre in 1/4 cubic metre multiples.There are various concrete mixes depending on your project. Here are some of the most common mixes:
A) Suitable where a minimum thickness of 100mm is needed, such as driveways, garage and workshop floors.B) For light duty strips and bases up to 75mm thick, such as garden paths.
C) Where great strength is not needed, such as garden wall foundations, bedding in slabs.
To calculate the volume of cement and aggregates needed, multiply the area’s length by its width by the required thickness of concrete. This will give you the number of cubic metres you are concreting. For each cubic metre of driveway concrete you will need 8 x 40kg bags of cement, 1/2 cubic metre of concrete sand and 3/4 cubic metres of 20mm aggregate (screenings).作者: 大唐飞哥 时间: 2013-3-12 13:29:56
铺15cm水泥后不放铁网,。。。。但成本要考虑吧,就拿30平方面积来举例,多5CM,就多出1.5立方的水泥,我算如果能拿到那些做地基的账户的价格20MPA19MM--$186+gst per m3, 多出的1.5立方要花费$320.85(包含gst)而且这5cm深度,不管是人手挖,还是挖土机挖也是成本,挖出来1.5立方的废土需要倒掉也是要收费的(除非自己有地方回填)。