Abstract One of the critical factors affecting performance alkali-activated slag (AAS) is nature and dose alkali activator. The activator type can play a significant role during transition from pastes to mortars or concretes. Therefore, three basic sodium activators (water glass, carbonate, hydroxide) same molarity 4M Na + were used prepare AAS-based with different volume fractions siliceous sa...

The aim of this work is to model the occurrence and intensity of calcium carbonate loss in calcareous forest soils under Mediterranean conditions. We have used 193 Spanish forest soils found on limestone parent material considered highly calcareous materials. This data set came from FOREDAF, a database containing 2200 complete soil profiles and all of them covered by forest stands (mainly domin...

Here we study the carbonate dissolution history of the deep SE Atlantic as evidenced in proxy records in Core T89-40 from the Walvis Ridge, spanning the last 1.1 million years. All dissolution proxy records (fragmentation index, ratio of planktonic and benthic foraminifera, sand fraction and number of planktonic foraminifera per gram sediment) show similar patterns, unique events, and these pro...

The maximum shear modulus (Gmax) is an important factor determining soil deformation, and it closely related to engineering safety seafloor stability. In this study, a series of bender element tests was carried out investigate the Gmax hydrate-bearing carbonate sand (CS)–silt mixture. mixture adopted CS:silt ratio 1:4 by weight mimic fine-grained deposit South China Sea (SCS). Tetrahydrofuran (...

Permian red beds of the De La Cuesta Formation in the Sierra de Narváez (Paganzo Basin, northwestern Argentina) are essentially composed of sandstones associated with mudstones and subordinate conglomerates. Facies distributions and stacking patterns indicate that these sediments resulted from the interaction between aeolian and ephemeral fluvial systems, and are represented by aeolian dune, dr...