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Recycling of ground jet grouting waste as a supplementary cementitious material KU Leuven
Jet grouting waste (JGW), a cement-soil mixture, represents a significant solid waste stream from soil consolidation activities. The current disposal of JGW at landfills posed a significant environmental issue in countries with limited land space. In this research, JGW was ground into powders without further special treatment and then used as a cementitious material. The properties of cement-based materials incorporating JGW powders were ...
Zinc oxide in alkali-activated slag (AAS): retardation mechanism, reaction kinetics and immobilization KU Leuven
The relatively fast setting of alkali-activated slag (AAS) greatly restricts its wide application. ZnO can serve as the retardant for AAS. However, the role of ZnO in AAS is not well understood. This paper investigates the retardation mechanism of ZnO in the AAS system and the effects of ZnO on the reaction and performance of AAS. Results showed that a ZnO dosage of 2 wt% prolonged the setting of AAS paste by 72 min and inhibited the growth of ...
Buildability assessment of mortar with fine recycled aggregates for 3D printing KU Leuven
In this paper, the buildability of a mortar incorporated with fine recycled concrete aggregates (recycled sand) for the purpose of 3D printing has been assessed according to the bi-linear thixotropy model. The natural sand from a reference, rheology based mortar for 3D printing, is gradually replaced with recycled sand using replacement rates of 25, 50 and 100 vol%. For each mixture, stress growth tests are performed at resting intervals of 0, ...
Precast Concrete Wall Panels Incorporating Mixed Recycled Aggregates KU Leuven
Mixed recycled aggregate (MRA) is considered a sustainable construction material, and its use in precast concrete is currently banned due to its poor engineering performance. This paper aims to evaluate the feasibility of partial replacement of natural coarse aggregate with MRA in self-consolidating concrete (SCC) for manufacturing architectural precast concrete sandwich wall panels. To this end, five MRAs from recycling plants were ...