Archives for September 2013

The Work Energy Principle Explained

Since energy can be neither created nor destroyed, external work performed on a system changes the system’s total energy. $latex W = {\Delta}E = E_2 – E_1$ The work energy principle introduces some simplifications into many mechanical problems, such as: You don’t need to know the acceleration of a body to calculate the work performed […]

All About Asphalt Aggregates

Aggregates comprise about 90 – 95% by weight and 75 – 85% by volume of the average asphalt mix. The properties of the final asphalt product are greatly affected by the grading of the aggregate. Coarse Aggregate is material retained on the #8 sieve (2.36 mm and larger). Fine Aggregate is material passing through the […]

What are the types of Portland Cement?

Portland cement is the primary ingredient in concrete. It is produced by burning a mixture of lime and clay in a rotary kiln and grinding the resulting mass. ASTM C-150 describes 5 classifications of portland cement Type 1: Normal portland cement Type 2: Modified portland cement Type 3: High-early strength portland cement Type 4: Low-heat […]

How to Determine USCS Soil Classification

The Unified Soil Classification System is a method of categorizing soils for use in engineering and geological applications. Soils are classified in USCS groups that are designated by a group symbol and a corresponding group name. The governing standard is ASTM D2487. Classification Groups The following are the soil classifications: Symbol Description GW Well graded, […]