Preparation and characterization of ferrous oxalate cement—A novel acid‐base cement

Abstract

Acid-base (AB) cements represent one kind of fast-setting cementitious materials that are formed through the reaction of an acidic liquid component and a basic metal oxide powder at room temperature, which yield a cementitious salt hydrogel and produce a noncoherent precipitate. Coherent bonds can develop between precipitating particles, which will grow into crystalline structures and form a ceramic-like matrix. 1 AB cements have been known for nearly two centuries, and different types of AB cements have been developed, including polyelectrolyte cements (eg, zinc polycarboxylate cement 2), oxysalt cements (eg, magnesium oxychloride cement 3), and phosphate cements (eg, calcium phosphate cement 4). Due to their special performance such as rapid setting, high early strength and low drying shrinkage, they have been widely

Development of Magnesium/Calcium Oxalate Cements

“…For both mixture types, pH quickly rises as Mg 2+ and Ca 2+ from the dissolution of the alkaline powders react with the available oxalate species (the oxalate and hydrogen oxalate anions). The pH of MgOx rises quickly to 8-9 within 24 h, after which it more or less plateaus, similar to the pH development reported for ferrous oxalate cement pastes (39). The rise in pH is much less for SlOx, only to ~5, suggesting less complete neutralization reactions, and explaining the lower 7 or 28 d strengths.…”

“…A diprotic acid, oxalic acid has pKa 1 = 1.27 and pKa 2 = 4.27. Hence, at the initial low pH of ~2 (Figure 5) more HC 2 O 4 and some H 2 C 2 O 4 are present in the solution (39). The continued dissolution of MgO1500 (forsterite and periclase) releases amorphous silica and Mg 2+ into solution (60), resulting in a rapid increase in pH (the first hour in Figure 5).…”

“…Replacement of dead-burned MgO with a less carbon-intense waste or natural material is needed to further decrease the carbon footprint of oxalate cements. Luo et al (39) recently reported a ferrous oxalate cement paste made with copper slag and oxalic acid. Medium to high compressive strengths were measured on 2 cm cube paste specimens but water resistance or reaction temperatures of the pastes were not reported.…”

Design and fabrication of high-performance injectable self-setting trimagnesium phosphate

“…S8 ). The cracks could be observed, which may presumably be created during the drying of the hydrated gel-like phase and the evaporating of the free water [ 28 , 29 ]. The number and width of cracks decreased significantly with increasing aging time, suggesting that the reaction further consumes the free water.…”

Regulation of Ethanol on Ferrous Oxalate Particle Size and Properties: Theoretical and Experimental Study

“…Ferrous oxalate dihydrate is a raw material in the mineral, metallurgy, energy and other industries, [1][2][3][4] playing an important role in the preparation of various iron oxide materials and lithium ion battery anode materials. [5][6][7][8] According to the literatures, [7][8][9] the morphology of ferrous oxalate dihydrate impacts the electrochemical performance of the synthesized materials.…”