The study aims to investigate the mechanism of early-age cracks in different massive concrete structures (i.e. tunnels, bridge foundations and underground parking garages), with objective answering following three specific questions: To basic a research program is performed which mixes are tested Temperature Stress Testing Machine (TSTM). Furthermore autogenous shrinkage measured ways. Modeling...

The early age volume changes occurring during the geopolymerisation reaction are not sufficiently understood yet, due to shortage of experimental data and theoretical models. This work presents new results on chemical autogenous deformation sodium-activated geopolymers from metakaolin, focussing first 72 h reaction. show that undergo early-age expansion, shrinkage. A model is proposed explain r...

The high cement content of high-performance concrete (HPC) results in improved strength, but also large shrinkage. substitution natural aggregates (NA) with recycled (RA) notably affects these properties conventional concrete. This study intends to analyse the effect RA and their maturity (time elapsed between casting crushing parent from which are obtained) on HPC. To this end, five mixes were...

BACKGROUND Shrinkage of cutaneous tissue during processing is a source of controversy. This study was designed to prospectively determine tissue shrinkage at two intervals: 1 min after excision and after 24 to 48 h of formalin fixation. Secondarily, gender, age, site, prior biopsy scar and solar elastosis were evaluated with respect to shrinkage. METHODS Ninety-seven cutaneous specimens were ...