The cementitious materials under consideration by Caltrans for rigid pavement construction may be classified into four categories: Portland cements and blends, calcium aluminate cements and blends, calcium sulfoaluminate cements, and fly ash-based cements. With the exception of Portland cements, most of the cementitious materials under consideration have not been extensively used for pavement c...

Alkali-free, aluminium-based accelerators are often used for shotcrete linings in tunnels and mines, where external sulfate attack can occur. Therefore, it is essential to know, if the influence of on cement hydrate assemblage negatively impacts resistance. This study focuses effect hydration consequences attack. Aluminum sulfate-based cause rapid setting due very early formation ettringite acc...

This study deals with the analysis of detrimental effects a “sulfate attack” on cement mortar for different dry-wet cycles. The mass loss, tensile strength, and gas permeability coefficient were determined analyzed under exposure conditions. At same time, nitrogen adsorption (NAD), scanning electron microscopy (SEM), X-ray diffraction (XRD) techniques used to analyze corresponding variations in...

Internal sulfate attack can be caused by the gypsum residues present in fine recycled aggregates (FRA). As opposed to better known external or Delayed Ettringite Formation (DEF), sulfates this context are provided a contamination of aggregates. Mortars made with contaminated FRA were subjected different conditions, assess which parameters had an influence on reaction. Their mechanical propertie...

Sulfate attack is one of the non-negligible factors that induces deterioration in performance and life cycle soil stabilizers. In this paper, degradation mechanism durability slag–fly-ash-based geopolymer stabilized soft (hitherto referred to as SF-GSSS) under sodium sulfate (Na2SO4) magnesium (MgSO4) environment comparatively investigated, slag/fly ash ratios are set S10F0, S9F1, S8F2, S7F3. T...