Interaction between low-grade magnesium oxide and boric acid in chemically bonded phosphate ceramics formulation

Magnesium Phosphate Cements formulated with a low-grade MgO by-product: Physico-mechanical and durability aspects

“…Moreover, a boric acid, Optibor Ò technical grade (HB), H 3 BO 3 , supplied by Borax España, S.A. (Castellón, Spain), was also used as a setting time retardant. An exhaustive description of the raw materials was carried out in an earlier study [44] and therefore the present paper only shows significant and relevant information.…”

“…As aforementioned, the experimental procedure described below followed the preliminary studies carried out by the authors [44]. Taking into account the setting time, workability and compressive strength values at different curing times, some formulations from the preliminary study were selected to evaluate repairing properties.…”

“…In order to overtake the economical limitation, the authors have studied the possibility of obtaining a MPC formulated with a low-grade magnesium oxide (LG-MgO) [43,44], which is obtained as a by-product from the calcination process of natural magnesite [45]. By this manner, the cost of the products could be substantially diminished, and the mortar obtained would be a competitive alternative, while enhancing sustainability criteria and recyclability.…”

“…By this manner, the cost of the products could be substantially diminished, and the mortar obtained would be a competitive alternative, while enhancing sustainability criteria and recyclability. According to the above mentioned, from previous works carried out by the research group [44], the relationship between LG-MgO, monopotassium phosphate (MKP), water kneaded, and boric acid (HB) as additive was determined, with the aim of finding a cement with a formulation that allows an optimum performance with good mechanical properties and hardening time [44]. Subsequently, a range of optimal dosages employing LG-MgO as raw material was determined.…”

Effect of Calcined MgO-rich Byproduct from the Extraction of Li₂CO₃ on the Performance of Magnesium Phosphate Cement

“…Asbestos-containing wastes have also been employed for preparing MPC (Viani et al 2013). In addition, the use of a hard-burning low-grade MgO can reduce the cost of quick repairs of concrete structures ( Formosa et al 2012).…”