Effect of curing conditions on the mortars with and without GGBFS

Çakır, Özgür; Aköz, Fevziye

doi:10.1016/j.conbuildmat.2006.08.013

Cited by 117 publications

(109 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These findings may be related to the substantial microstructural refinement attendant upon slag hydration (6,7,28), in which additional C-S-H phases form (12), giving rise to a more compact pore network. Moreover, the fact that early age electrical resistivity values were similar in the two types of cement studied, but slightly higher for CEM I at w:c ratios of 0.5 and 0.55 may be attributable to the slower reaction rate in slag hydration (7,34).…”

Section: Durability-related Propertiesmentioning

confidence: 99%

Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications

Ortega¹,

Pastor²,

Albaladejo³

et al. 2014

Mater. construcc.

View full text Add to dashboard Cite

Special foundations, most prominently micropiles and soil anchors, are frequently used in construction today. In Spain, the grout for these special technical applications is generally prepared with portland cement, although the codes and standards in place stipulate only the minimum compressive strength required, with no mention of cement type. Those texts also establish a range of acceptable water:cement ratios. In the present study, durability and compressive strength in cement grout prepared with blast furnace slag cement at different w/c ratios are characterised and compared to the findings for a reference portland cement grout. The results show that slag grout exhibits greater durability than the portland cement material and complies with the compressive strength requirements laid down in the respective codes. RESUMEN: Caracterización de las propiedades de durabilidad y resistencia a compresión de lechadas de cemento con escoria de alto horno para trabajos geotécnicos especiales.Actualmente es muy frecuente el empleo de cimentaciones especiales, entre las que destacan los micropilotes y los anclajes. En España, las lechadas de cemento para estos trabajos geotécnicos especiales se preparan habitualmente con cemento Portland, aunque las diferentes normativas al respecto no restringen el tipo de cemento a emplear, siempre que se alcance una determinada resistencia a compresión. Respecto a la dosificación de las lechadas, la normativa permite emplear diferentes relaciones agua/cemento dentro de un determinado rango. En vista de ello, en este trabajo se han caracterizado las propiedades de durabilidad y resistencia a compresión de lechadas de cemento preparadas con un cemento con escoria de alto horno y con diferentes relaciones a/c, tomando como referencia de comportamiento lechadas de cemento Portland. El uso de un cemento con escoria conlleva una mejora en la durabilidad de las lechadas, cumpliendo los requisitos de resistencia a compresión establecidos por la normativa.

show abstract

Section: Durability-related Propertiesmentioning

confidence: 99%

Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications

Ortega¹,

Pastor²,

Albaladejo³

et al. 2014

Mater. construcc.

View full text Add to dashboard Cite

show abstract

“…Regarding those non-optimum laboratory hardening conditions, there are several researches where slag and fly ash cementitious materials were kept under different constant temperature and relative humidity [29][30][31][32][33][34][35][36][37] and most of them concluded that overall the performance of those materials was adequate [30,31,[33][34][35]38], mainly when the condition presented relatively high values of those environmental parameters [30,31]. Nevertheless, the above-mentioned research has only studied the influence of those parameters over a relatively short time (in general less than 1 exposure year) and their effects would probably be more noticeable after very long exposure times.…”

Section: Introductionmentioning

confidence: 99%

“…For environment A, generally this parameter decreased with time for all of them. This result could be related to the high relative humidity (100%) combined with a high enough temperature (20 • C) of this optimum environment, which allows an adequate development of clinker and slag hydration [30,44] and fly ash pozzolanic reactions [44,48], whose products would entail a rise of samples solid fraction and consequently a porosity reduction. The lowest total porosities for environment A corresponded to CEM III mortars, while this parameter was very similar for CEM I and II mortars and a little higher for CEM IV ones, which would be in keeping with other authors [7].…”

Section: Mercury Intrusion Porosimetrymentioning

confidence: 99%

“…However, the reduction rate with time of this parameter was lower for mortars exposed to environment B. The slightly higher total porosities and their slower decrease observed for environment B could be due to its lower temperature (15 • C), which would slow down the development of clinker and slag hydration [29,30], as well as the fly ash pozzolanic reactions [36,49], producing a slower formation of new solid phases. Furthermore, the lower relative humidity (85%) of this environment B in comparison with environment A would entail that less water would be available in the long-term to carry on the development of abovementioned reactions, which would hinder them [44], as suggested that total porosity kept practically constant at very high ages, especially for CEM I and III mortars.…”

Section: Mercury Intrusion Porosimetrymentioning

confidence: 99%

“…The fact that this parameter showed slight modifications could be related to the low environmental relative humidity (65%), although it is combined with an optimum temperature (20 • C). This optimum temperature would permit a suitable development of hydration and pozzolanic reactions [30,36] but the relatively low environmental relative humidity would make it difficult [44,48,50], causing a smaller new solid phases formation. Once again, the mortars prepared using sustainable cements with slag and fly ash hardened in the environment C, also showed lower or similar total porosities in the very long-term compared to CEM I mortars.…”

Section: Mercury Intrusion Porosimetrymentioning

confidence: 99%

See 2 more Smart Citations

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

View full text Add to dashboard Cite

Nowadays, getting a more environmentally sustainable cement production is one of the main goals of the cement industry. In this regard, the use of active additions, like fly ash and ground granulated blast-furnace slag, has become very popular. The behaviour, in the short-term, of cement-based materials with those additions is well-known when their hardening is produced under optimum conditions. However, real structures are exposed to different environments during long periods, which could affect the development of microstructures and the service properties of cementitious materials. The objective of this work is to analyse the effects in the long-term (up to 5 years approximately) produced by the exposure to different non-optimum laboratory conditions in the microstructure, mechanical and durability properties of mortars made with slag and fly ash commercial cements. Their performance was compared to that observed for ordinary Portland cement (OPC) mortars. The microstructure has been analysed using mercury intrusion porosimetry. The effective porosity, the capillary suction coefficient, the chloride migration coefficient and mechanical strengths were analysed too. According to the results, mortars prepared using slag and fly ash sustainable commercial cements, exposed to non-optimum conditions, show a good performance after 5-years hardening period, similar or even better than OPC mortars.

show abstract

Predicting compressive strength of green concrete using hybrid artificial neural network with genetic algorithm

Pan

Wang

et al. 2022

Structural Concrete

View full text Add to dashboard Cite

With the growing usage of supplementary cementitious materials (silica fume, fly ash, and ground blast furnace slag, etc.) in concrete, accurate prediction of green concrete compressive strength (CS) has become an issue worth investigating. In this paper, a green concrete CS prediction model was developed using hybrid artificial neural network with genetic algorithm (GA-ANN) based on 2479 green concrete CS experiment results. Also two prediction models based on support vector regression (SVR) and ANN algorithm were developed for comparison. Five new parameters were constructed based on the original nine influencing parameters of CS, taking all 14 parameters as input variables, the influence of the constructed parameters on the model performance was studied. Feature selection was then performed based on the maximum information correlation (MIC) and sensitivity analysis results, which could improve the model by deleting several parameters. The results showed that the prediction performance of the SVR, ANN, and GA-ANN models were improved after adding new parameters, the GA-ANN model has the best prediction performance. The accuracy and robustness of the GA-ANN model were effectively improved by deleting the input variables with lower MIC and sensitivity values.

show abstract

Effect of curing conditions on the mortars with and without GGBFS

Cited by 117 publications

References 11 publications

Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications

Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

Predicting compressive strength of green concrete using hybrid artificial neural network with genetic algorithm

Contact Info

Product

Resources

About