A widely used coating system for corrosion mitigation of offshore steel structures is thermally sprayed aluminium (TSA). Even though these coatings have been decades, it not always clear how they perform in service over long periods, particularly if damaged during installation or service. To understand the behaviour TSA seawater and their tolerance to levels damage, (1050 Al) were prepared on c...

Cementitious concrete structures serving in sulfate environments suffer from serious durability challenges caused by chemical attacks (CSA), which lead to the volume expansion, cracking, and spalling of early failure structures. CSA on involves behaviors ion transport, reactions, crystallization reaction products, microstructural damage cement matrix, macroscopic deterioration concrete, namely ...

Abstract The effect of carbonates on the formation magnesium silicate hydrate phases (M-S-H) was investigated in paste experiments. At molar ratio Mg/Si = 1.5, M-S-H pastes were synthesised from silica fume and MgO or MgO/hydromagnesite a sodium carbonate-rich environment (dissolved 1.7 g Na 2 CO 3 for 100 binder). Thermogravimetric analysis, X-ray diffraction, 29 Si MAS NMR data showed that fo...

Abstract This study focused on the development of 3D printed building components incorporating MgO–SiO2 binders. The effects parameters such as MgO/SiO2 and water/binder ratios superplasticizer dosage were evaluated to produce printable assessment rheological mechanical properties, which led an optimum mix that satisfied printability criteria, was supported by microstructural characterization. ...

An innovative approach involving a collection of experiments to mimic and assess the different conditions (at selected time-pH-[Mg2+]-humidity) existing during carbonation process in dolomitic mortars is proposed with combination micro-analytical imaging techniques, namely: optical electron microscopy, micro-Fourier-Transform Infrared spectroscopy, Raman spectroscopy synchrotron-based micro X-r...

Formulations based on mineral fillers and polymeric matrices of different nature were studied to obtain halogen-free flame retardant compounds (HFFR) for cable applications. The work was carried out by comparing fire-retardant natural origin with synthetic ones available the market. As a reference, formulation micronized magnesium hydroxide (n-MDH, obtained from brucite) an ethylene-vinyl aceta...

Aluminum sulfate shows a positive effect on preventing efflorescence of magnesium potassium phosphate (MKP) cements. Its influence the MKP cement properties and hydration is explored in this study. Compared to reference (Mg/PO4 molar ratio = 4, w/c 0.25), aluminum retards setting, increases compressive strength, has little short-term volume stability. slows down kinetics, decreases pH values, a...

A synthetic Topopah Spring Tuff water representative of one type of pore water at Yucca Mountain, NV was evaporated at 95 °C in a series of experiments to determine the geochemical controls for brines that may form on, and possibly impact upon the long-term integrity of waste containers and drip shields at the designated high-level, nuclear-waste repository. Solution chemistry, condensed vapor ...

Hydromagnesite occurrences in British Columbia have been recognized since the beginning of the 19th century (Reinecke, 1920; Young, 1915). However, the known occurrences of hydromagnesite are too small to compete with the large sparry magnesite deposits in British Columbia (Grant, 1987; Simandl et al., 1996 a,b and Simandl, 2000) as potential sources of raw materials for the production of indus...