Effects of Attapulgite and Nano-Silica on 3D Printability of High Strength Gypsum Plaster

Abstract

Abstract: In this paper, the effects of attapulgite (ATP) and nano-silica (NS) on printability such as pumpability, rheology, buildability as well as solidified sample strength of α-hemihydrate gypsum plaster for 3D printing were investigated. Results show that the pumping force of plaster with ATP remains at (0.57±0.02) kN. The shear stress against strain rate curve does not change much with ATP addition. The 0 h and 4 h collapse angles of the printed plaster with 2.8% (mass fraction, the same below) ATP decrease from 24° and 32° to 8° and 11°, respectively. In comparison to ATP, the pumping force increases by the addition of NS. The pumping force of the plaster is nearly doubled with 2.8% NS in comparison with the plaster with ATP of the same additive content. Meanwhile, the initial shear stress of the plaster with the increase of NS addition also increases. Although the addition of NS leads to the increase of the pumping force, the buildability of the plaster with NS is better than the plaster with ATP. 0 h and 4 h printed plasters with 2.8% NS both show little slump. The solidified plaster with ATP or NS addition amount 1% to 2% is printable, and its compressive strength is strengthened, but the interlaminar bonding strength is weakened by 2/3 compared with the control sample.

Key words: gypsum, 3D printing, attapulgite, nano-silica, printability, rheology, strength

CLC Number:

TU526

YU Yue, JIA Junhong, DUAN Bin, WANG Kuan, HONG Zhengdong, CAO Ruoyu, HUANG Jian. Effects of Attapulgite and Nano-Silica on 3D Printability of High Strength Gypsum Plaster[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1987-1996.

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