Figure 5.
The image presents a microscopic view of mineral aggregates, showcasing a variety of shapes and textures. Notable features include thin, dark lines that appear to traverse the image, along with an array of shimmering particles and irregular shapes densely packed throughout. A scale bar at the bottom right corner indicates a measurement of fifty micrometres, providing a point of reference for the sizes of the minerals depicted. The overall composition suggests a complex geological structure, with areas of light reflection indicating different mineral properties.A crack propagating from a reactive andesite particle (lower right) to a non-reactive limestone particle (upper left) through cement paste (Kawabata et al., 2019). The black parts in the right lower and left upper positions of the crack are voids