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Effects of the distribution of solid particles on the rheological properties and buildability of 3DPM fresh pastes with different FA/GGBFS content

Xu Zhuoyue, Zhang Dawang, Li Hui, Sun Xuemei

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e82, 2023

3D printing technology has attracted great attention from the construction industry for its superior performance compared with traditional construction technology. In this study, the rheological properties of fresh mixed pastes with different contents of fly ash (FA) and granular ground blast furnace slag (GGBFS) were evaluated by analyzing rheology indices and the fitting of the Bingham model, and the relationship between the rheological properties, the buildability of 3D Printing Material (3DPM) and n value of the Rosin-Rammler distribution function was established. The results show that with increasing FA or GGBFS content, the rheological properties (fluidity, yield stress, and plastic viscosity) of fresh mixed pastes first improved and then deteriorated, and the n value (constant for the width of the particle distribution) first decreased and then increased. When the FA content was 20%, the paste fluidity reached a maximum value of 178 mm, the n value (1.01782) was the smallest, the particle size distribution was the widest, the accumulation was the best, and the buildability of 3DPM was the best. In addition, it can be seen from the SEM analysis that FA and GGBFS participate in the cement hydration to a limited extent, which mainly play the role of compaction and adjustment of particle size distribution. This is consistent with the test results of XRD. In short, by adjusting the amount of FA and GGBFS, the particle size distribution of the whole cementitious material system changes. When the fluidity of 3DPM was between 160 and 180 mm, the smaller the n value of the Rosin-Rammler distribution function, the better its buildability was.

Analiza rozkładów wielkości kropel generowanych przez rozpylacze stosowane w technologii odazotowania spalin

Wrzesińska B., Krzywda R., Wąsowski T.

Inżynieria i Aparatura Chemiczna

2017

Nr 4

150--151

W technologii selektywnej niekatalitycznej redukcji tlenków azotu z gazów spalinowych (SNCR) stosowane są rozpylacze pneumatyczne, które zapewniają odpowiedni rozmiar i energię kinetyczną kropel. Przeprowadzono badania eksperymentalne rozpylania cieczy przez dysze (lance) do komory, symulującej przestrzeń kotła energetycznego. Wykonano pomiary średnic kropel generowanych przez rozpylacze pneumatyczne, a następnie obliczono parametry, tj.: średnia średnica powierzchniowo-objętościowa Sautera, parametry rozkładu Rosina-Rainiera. Pokazano uzyskane przykładowe rozkłady średnic kropel.

In selective non-catalytic reduction of nitrogen oxides from combustion gases (SNCR) pneumatic sprayers, which provide the proper size and kinetic energy of the droplets, are used. Experimental studies have been conducted on spraying liquid through lances into the chamber simulating the space of heating boiler. Measurements of droplet diameters generated by pneumatic sprays were carried out and the characteristic parameters were calculated, i.e. Sauter average surface-volume droplets diameter and Rosin-Rammler distribution parameters. Examples of size distributions of droplets are shown.