Effects of Lightweight Aggregates on Autogenous Deformation in Concrete

Pore Structure and Permeation Characteristics of Foamed Concrete

“…(4) The predictive permeability equation derived by Katz and Thompson best fits the air permeability results determined in this investigation. (5) Both the critical pore diameter and the pore range with diameter >200 nm decrease with increase in the density and there is a strong positive relationship between them and the permeability of foamed concrete, confirming the suggestion of (Akçay, 2007) that these are the pore sizes which control permeability. (6) The observation that water absorption decreases with added (foam) voids, suggests that these voids may not lead to an increase in water transport through foamed concrete.…”

Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

“…Akçay [2] has investigated the AS using water saturated lightweight aggregate instead of the normal aggregate in mortar, cement and concrete samples and finally, stated that the use of lightweight aggregate effectively reduces the AS. Keskin et al [53], Lura [54] and Bentz and Snyder [55] and many researchers investigated the effect of the different amounts of different lightweight aggregates on AS and all agreed that lightweight aggregate reduces the AS.…”

“…The goal of their study was to find an optimum where the AS reduction is as high as possible and the strength reduction as low as possible. In general, studies have been made towards the reduction of AS [1,2,[4][5][6]8,[10][11][12][13]. For mixtures of the same water-binder ratio and grading, no study on the effects of the EPA, nano-clay, MgO, CaO and nano-MgO and nano-CaO and their combinations on the mortars in terms of AS could be found in the literature up the date the study has been done.…”

“…In recent years there have been an increase in the use of super plasticizer chemical additives in the application of high performance concrete (HPC) due to its superior properties [1], such as high strength and low permeability, which are achieved through its characteristically dense microstructure [2]. HPC significantly reduce maintenance costs and enhance service life [1,3].…”

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

“…LWA particles can reduce the autogenous shrinkage as these particles can act as internal water reservoirs and aid in providing internal curing [186,187]. A major disadvantage, especially associated with coarse LWA particles, is a decrease in the consistency and strength of the concrete matrix.…”