Validation of slag-binder fiber-reinforced self-compacting concrete with slag aggregate under field conditions: Durability and real strength development

Effects of temperature and moisture fluctuations for suitable use of raw-crushed wind-turbine blade in concrete

“…A five-stage mixing process was implemented to ensure the highest possible level of concrete workability. The stages were intended to maximize aggregate water absorption during mixing (Güneyisi et al 2014 ), to compensate for the expected loss of workability when RCWTB was added, due to the presence of GFRP-composite fibers (Ortega-López et al 2022 ), and to ensure a uniform distribution of RCWTB in the concrete mass. These stages involved: (1) the addition of all the aggregates and 30% of the mix water shown in Table 2 , and mixing during 3 min; (2) the addition of the cement together with the remaining mix water, and mixing during 3 min; (3) the addition of half of the admixtures dissolved in a quarter liter of water, and mixing during 2 min; (4) the addition of RCWTB, and mixing during 2 min; (5) the addition of the other half of the admixtures dissolved in another quarter liter of water, and concrete mixing for 5 min.…”

“…The specimens were demolded 24 h after concrete manufacture and stored in a standardized humid chamber at a temperature of 20 ± 2 °C and a humidity level of 90 ± 5% until an age of 90 days. The strength was considered to have stabilized at this age (Ortega-López et al 2022 ) and, therefore, all tests were conducted when the concrete was 90-day old.…”

“…The moist phase for each cycle lasted 16 h and consisted of immersing the specimens in water at an indoor temperature (20 ± 2 °C). The dry phase involved oven drying the specimens at a temperature of 70 ± 2 °C for 8 h. In this way, extreme environmental conditions of exposure to rain and solar radiation were simulated, which can be found, for instance, on pavements (Ortega-López et al 2022 ). The alternating-sign-temperature-shock test was also performed by exposing the concrete to ambient cycles.…”

“…This damage was verified when the tests ended through scanning electron microscope (SEM) analyses performed on portions from within different concrete specimens. In addition, the length of the specimen edges (8 edge lengths per specimen) was measured before and after these tests to evaluate the dimensional variation of concrete under those environmental conditions (Ortega-López et al 2022 ). Finally, hardened density and compressive strength were also determined at the end of these tests, to study the deterioration of those properties in relation to the reference values.…”

Impact of M-Sand on Rheological, Mechanical, and Microstructural Properties of Self-Compacting Concrete

“…The SCC method of placing concrete has significantly impacted the concrete placement and construction process [5]. It is undoubtedly the most significant advancement in concrete technology in recent years [6]. Although the SCC relative contribution of aggregates is relatively lower than this substance, Normally Vibrated Concrete (NVC) remains a significant component of SCC and significantly affects both the properties of freshly formed concrete and hardened concrete [7].…”