The formula for concrete mix is one part cement, two parts sand and three parts gravel or crushed stone. If hand mixing, it's inadvisable to exceed a water to cement ratio of 0.55, which translates to 55 pounds of water for every 100 pounds of cement.Know More
When mixing concrete, it's necessary to ensure that there is an adequate amount of aggregate. Leaving out the stone or sand aggregate weakens the concrete mix. Nearly all the properties of any concrete mix are primarily controlled by the water and cement ratio, especially strength and durability. It's possible to strengthen the concrete mix by adding additional cement without changing the proportion of sand and stone. The addition of excess water also weakens the concrete mixture. If a workable concrete mix can be made with less water, it is better for the concrete.
Mixing by hand does not necessarily save money compared to ordering from a ready-mix company unless the location where the concrete is needed is very remote. Hand-mixing is very hard work. The other consideration is the quality of the concrete, and the ready-mix option is usually the ideal option because of the better proportioning of the ingredients and more thorough mixing.
After pouring the concrete, mixers need to ensure that it cures properly with a curing compound. Typically, curing compounds are sprayed on the concrete after the final operation. A white-pigmented curing compound works best in dry, hot climates.Learn more about Building Materials
Concrete is composed of aggregates, which can be any or a combination of sand, gravel or rocks that is held together by cement. The cement itself, when mixed with water, serves as a paste that holds all the components of the concrete together once the cement sets and hardens.Full Answer >
Hawaii's mining products include: sand, gravel, stone, portland cement and masonry cement, plus gemstones, according to City-Data. At the beginning of the 21st Century, the value of these non-fuel minerals was approximately $70 million. In 2001, crushed stone was worth the most at $51.9 million, followed by portland cement at $10.2 million. Most of Hawaii's minerals are used in construction projects on the islands.Full Answer >
On the first day, mix one part dog food to three parts rice; move to two parts dog food to two parts rice on the second day; three parts dog food to one part rice on the third day; and back to a full dog-food diet on the fourth day. When returning a dog who has been on a bland diet back to his normal diet, it is important to reintroduce his normal diet over the course of four days to prevent stomach upset.Full Answer >
The standard ratio for general purpose mortar, type N mortar, is one part Portland cement, one part lime and six parts sand. Type N mortar is typically used for exterior walls above ground level that are exposed to the elements. It is also appropriate for interior load-bearing walls.Full Answer >