Concrete is made up of cement, aggregate (particles of stone) and sharp sand. When you mix these ingredients with water, they bind into a solid, hard material. In different proportions, they produce concrete of different strengths for different uses. It’s important to get the proportions right. If there’s too much aggregate, you’ll struggle to get …
Circular reinforced columns have higher strength than square or rectangular columns. Circular cross-section columns are more resistant to buckling as compared to a rectangular cross-section. Furthermore, circular sections will have uniform torsion characteristics. circular column design spreadsheet example The difference between the strength of two different types of columns: Columns having shear reinforcement in form of spirals gives better …
To make concrete there are four basic materials you need: portland cement, sand, aggregate (stone), and water. The ratio of aggregate to sand to cement is an important factor in determining the compressive strength of the concrete mixture. The mixing process is the fact that the better you mix the concrete, the stronger it will …
Concrete Mix – Download Spreadsheet to Estimate Quantities of cement, sand, stone Read More »
Concrete joints are used to compensate when concrete expands or shrinks with changes in temperature. Concrete joints are normally used to prevent cracks when the concrete shrinks, by creating forming, tooling, sawing and placing joint formers. The pre-planned cracks will provide a better finish concrete product and will be formed in specific locations where those …
3 Types of Concrete Joints in Building Structures Read More »
Concrete drop during vertical placement shall not exceed 2.5m. For heights greater than 2.5m, the Contractor shall pour concrete through enclose chutes or access hatches, details of which shall be approved by the Engineer. This must comply with four main requirements, namely: It must be rapid so that the concrete does not dry out, lose …
Specification for Transporting and Placing Concrete Read More »
While estimating quantity of concrete for particular structural work, we normally consider 3-5% as wastage. But concrete waste more than that can increase the cost of project and may impact project progress. So, it is necessary to control the concrete wastage at site. Concrete wastage can be prevented by proper planning of pour. Concrete pour cards shall …