@article{Chaplianko_Nikichanov_2020, title={Deflocculants for refractory castables (review)}, volume={120}, url={https://refractories-journal-ua.com/index.php/journal/article/view/60}, DOI={10.35857/2663-3566.120.09}, abstractNote={<p>Review and analysis of foreign studies aimed at researching the influence of various deflocculants on properties of refractоry castables have been executed. Technological efficiency of deflocculants application had been shown:– ADS/W brands comparison to polyacrylate and sodium threepolyphosphate in alumina-cement-based mixture in terms mass`s humidity reduction of 17 % and 22 % to obtain the required vibration flow (200 mm) and samples` compressive strength increase of 29 % and 56 %;</p> <p>– M-ADS/W brands comparison to ammonium polymethacrylate and sodium hexametaphosphate in low-cement high-alumina castable in terms mass`s vibration flow increase of 5 and 14&nbsp;%, samples’ compressive strength increase of 23 and 14 % for heat-treated at 110&nbsp;°C and of 44 and 53 % for fired at 1500&nbsp;°C;</p> <p>– brand REFPAC MIPORE&nbsp;20 comparison to Peramin&nbsp;AL200 in low-cement corundum-spinel castable in terms of mass`s vibration flow increase of 5 %, gas permeability increase in 15&nbsp;times with samples` compressive strength decrease of 30 % and differences in water evaporation temperature, with samples’ size increasing, reduce to 3&nbsp;°С (against 78&nbsp;°С); in comparison with sodium threepolyphosphate in medium-cement corundum castable with cement content decrease of 2,5&nbsp;% — gas permeability increase in 12 times and differences in water evaporation temperature reduce to 4&nbsp;°С (against 50&nbsp;°С); in multi-cement corundum castable with cement content decrease of 2,5&nbsp;% — differences in water evaporation temperature reduce to 10&nbsp;°C;</p> <p>– brand REFPAC&nbsp;100 comparison to polycarboxylate esters and sodium threepolyphosphate in terms of differences in flow of “freshly prepared” and “aged” low-cement castables, made using high-purity bauxite and silica fume, reduce to 17 % (against 19 and 41 %); vibration flow of “freshly prepared” and “aged” castables, made using lower quality materials, increase of 98 and 8&nbsp;%;</p> <p>– brands REFPAC&nbsp;288:REFPAC&nbsp;388 at ratio of 50:50 comparison to REFPAC&nbsp;388 in low-cement corundum-spinel castables at ambient temperature of 5&nbsp;°C in terms of vibration flow of “freshly prepared” and “aged” masses increase of 4 and 80 % with samples` compressive strength decrease of 7 % after curing and 4 % after drying; at ratio of 75:25 comparison to 62,5:37,5 at 20&nbsp;°C — terms of vibration flow of “freshly prepared” and “aged” masses increase of 10 and 14 % with samples` compressive strength increase of 16 % after curing and 4 % after drying;</p> <p>– brand REFPAC&nbsp;500 comparison to Peramin&nbsp;AL&nbsp;200 and/or Peramin&nbsp;AL&nbsp;300 in low-cement castables with high-purity materials in terms of time for massive precipitation of calcium aluminate reduce in 10 and 3 times at temperatures of 5 and 20&nbsp;°С, and also increase in 2 times at 35&nbsp;°С;</p> <p>– polycarboxylate esters with length side chain and very short side chain in low-cement corundum castable with lower and high-purity silica fume;</p> <p>– brand FS&nbsp;10 in cement-less corundum castable in terms of CMOR increase of 18 %, but comparison to sodium threepolyphosphate — to its reduction of 10 %.</p&gt;}, journal={Scientific research on refractories and technical ceramics}, author={Chaplianko, S. V. and Nikichanov, V. V.}, year={2020}, month={Dec.}, pages={98-114} }