What type of cracking is caused by higher cement paste content leading to increased water penetration?

Shrinkage cracking occurs when the volume of concrete decreases due to moisture loss or temperature changes. When there is a higher content of cement paste in the concrete mix, it can lead to an increase in the water-to-cement ratio, which, while it may initially enhance the workability of the concrete, also can lead to excessive porosity and vulnerability to cracking.

As the concrete cures and hardens, evaporation of water can lead to a reduction in volume. If the shrinkage of the concrete exceeds the ability of the tensile strength to accommodate the change, cracks will form. This type of cracking is particularly relevant in structures or elements that have a higher surface area exposed to the air, allowing for rapid moisture loss.

In this context, the presence of excessive cement paste not only affects the hydration process but also contributes to the potential for more significant shrinkage, thereby making shrinkage cracking a pertinent concern in construction and civil engineering.