Optimization of grouting reinforcement performance of superfine sulfoaluminate cement composite system by Pengfei WANG, Pengyun YAN, Mingxuan ZHANG

“…By combining macro performance test and micro structure characterization, the development of slurry fluidity, coagulation and hardening characteristics and mechanical strength were comprehensively evaluated, and the evolution of hydration products and performance regulation mechanisms were revealed through XRD, SEM and other analytical means, and the optimization effect of the materials was finally verified through the downhole grouting project.The experimental results show that: ① The type of water-reducing agent has a significant role in regulating the performance of the material: when the dosage of PCE is 0.6%, the 28 d compressive strength of the grouting material is the highest and shows a continuous growth trend, with the highest increase of 20.27%; while the strength inflection point of FDN occurs when the dosage of FDN is 0.3%, and the excessive dosage (>0.6%) leads to the decrease of strength. …”
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MODELLING OF CRACK PROPAGATION: COMPARISON OF DISCRETE LATTICE SYSTEM AND COHESIVE ZONE MODEL by Karel Mikeš, Franz Bormann, Ondřej Rokoš, Ron H.J. Peerlings

“…For crack propagation modelling, the underlying discrete microstructure is typically replaced with an effective continuum, whereas the crack is inserted as an infinitely thin cohesive zone with a specific traction-separation law. …”
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