Pozzolans are used as additives in stabilizing clayey soils and trass cement production. Natural unnatural pozzolans added to the ground stabilization process increase bearing strength of soil, reduce deformations that will occur a result stresses, settlements, swelling potential, liquefaction potential permeability. It Pozzolans, which called trass, heat hydration, resistance concrete against ...

he possibility to obtain sintered material from alkaline basaltic tuffs is demonstrated. The parent rock was milled for 10–15 min, the resulting owder was pressed at 100 MPa and the obtained samples were heat-treated in the range of 1000–1140 ◦C. The sintering behaviour and the phase ormation were studied by pycnometry, dilatometry, DTA, XRD and SEM. The final material was obtained by sintering...

Abstract Many historically significant buildings and cultural heritage sites are made of volcanic tuffs. These subject to a progressive weathering partly in ruinous conditions. Preparing suitable stone replacement mortar for repair work or even whole stones these rocks is great interest. During the quarrying tuff rocks, more than 40% material rejected cannot be further used. Utilizing this mate...

mehredjan bentonite deposit is located ~33 km southeast of khoor in isfehan province. it includes 15 discrete outcrops and occurs as layered and massive forms within a volcano-clastic sequence. bentonitization process was accompanied with development of minerals such as montmorillonite, quartz, cristobalite, calcite, kaolinite, halite, albite, orthoclase, and muscovite. the collected field and ...

Twenty-eight new high-precision Chemical Abrasion Isotope Dilution Thermal Ionisation Mass Spectrometry U-Pb zircon dates for tuffs in the Sydney and Bowen Basins are reported. Based on these new dates, the Guadalupian-Lopingian/Capitanian-Wuchiapingian boundary This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online ...

The present study focuses on clinoptilolite (CLI)-rich natural zeolitic tuffs and their photocatalytic activity in the degradation of cationic organic dyes. CLI from different regions was tested methylene blue (MB) as a model dye. tests were performed at room temperature atmospheric pressure under visible light irradiation. For all samples, highest observed pH = 6. Total MB varied between 70 91...