Cracked Concrete Driveway

A one-year old concrete driveway at a home in Woodlands, Texas has sustained severe and extensive cracking. The goal was to identify the potential cause(s) of the cracking.

Aggregate Updates

Aggregate – a rock - is used in many applications including, as filler for filling up voids during construction and in concrete.

Portland Cement

Commonly referred to as cement, it is widely used all over the world as one of the basic ingredients of concrete, mortar, and stucco.

Alkali-Silica Reactivity in Concrete

One of the damaging defects caused in concrete is due to alkali-silica reaction (ASR) in the concrete. Typically, the reaction of finely-divided forms of silica in aggregates

Sulfate-attack in Concrete

Dissolved soluble sulfates in waters – e.g. in rivers, sewer units and lines – react with certain components of Portland cement to form an over-sized reaction product.


Concrete consist of about 60 to 75% of rocks hence a strong contributor to its properties. Physically, the rocks must be strong and durable. In the environment that the rocks reside in the hardened concrete it could be susceptible to chemical…