The right protocol to measure yield stress of cement paste

The rheology of cementitious material paste is complex and difficult to be investigated. One value of rheology is yield stress. The best method to measure the yield stress in laboratory is using the vane method. However, there is no much literature reporting an practical and detailed testing protocol to measure the yield stress of cement […]

How to define particle size?

Particle size is a very important property in the research field of cementitious materials, e.g. modeling, reaction kinetics. Particles are 3-dimensional objects, and unless they are perfect spheres, e.g. emulsions or bubbles, they cannot be fully described by a single dimension such as a radius or diameter. In order to simplify the measurement process, it […]

What is Geopolymer cement?

I have been confused by the term “Geopolymer cement (concrete)” for long time. Some researchers told me Geopolymer cement is essentially alkali activated cement/material (AAMs), such as alkali activated slag and fly ash. Since alkali activated slag is indeed a kind of geopolymer cement, it looks logical to consider Geopolymer cement as alkali activated cement. […]