Utilisation of By-Product Phosphogypsum Through Extrusion-Based 3D Printing.

Phosphogypsum (PG) is a phosphate fertiliser by-product. This by-product has a low level of utilisation. Calcium sulphate is dominated in PG similar to gypsum and, therefore, has good binding properties (similar to natural gypsum).

Production of an eco-friendly concrete by including high-volume zeolitic supplementary cementitious materials and quicklime.

The production of ordinary Portland cement (OPC) is one of the main global causes of CO release to the atmosphere. However, its availability and unique characteristics as a binding material make it difficult to be substituted by eco-friendlier materials. However, OPC partial replacement with pozzolanic materials is one of the best solutions to this problem.

Concrete Shrinkage Analysis with Quicklime, Microfibers, and SRA Admixtures.

This research explores the effect of various humidity conditions and the efficiency of shrinkage-reducing admixtures on the free shrinkage strain of ordinary Portland cement (OPC) concrete and its mechanical properties. An OPC concrete C30/37 mixture was replenished with 5% of quicklime and 2% of organic-compound-based liquid shrinkage-reducing agent (SRA). The investigation revealed that a combination of quicklime and SRA led to the highest reduction in concrete shrinkage strain.