ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 64, (2) 200 - 214 (2020)

Zhou Jiaqi 1, Liu Panpan 1, Wu Chengyou 2, 1, Du Zejin 1, Zong Jingping 1, Miao Meng 1, Yu Ruiyang Pang Hongfa 3
1 School of Civil Engineering, Qinghai University, Xining 810016, PR China
2 Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining 810016, PR China
3 Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China

Keywords: Foam concrete, Molar ratio, Admixture, Microstructure, Structural characteristics

To broaden the application of magnesium oxychloride cement (MOC) in thermal insulation materials, lightly burned magnesia powder and magnesium chloride hexahydrate were used as the main raw materials of cement and a chemical foaming method was used to prepare a magnesium oxychloride cement foam concrete (MOCFC) with fast hardness and early strength. By changing the molar ratio (M) of the MOCFC and adding different dosages of hydrogen peroxide (H₂O₂), fly ash (FA), potassium dihydrogen phosphate (KDP) and other admixtures, while measuring and observing the compressive strength and flexural strength at 3, 7, and 28 days, the thermal conductivity, dry apparent density, volume water absorption, softening coefficient, and other parameters, combined with its hydration phase composition and microscopic appearance, the effect of the molar ratio and the admixtures on the properties of MOCFC were studied. The results show that with an increase in the molar ratio and the dosage of H₂O₂, FA and KDP, the internal pore structure of the slurry changes significantly, which affects its mechanical properties, water resistance, and thermal insulation performance.

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doi: 10.13168/cs.2020.0009
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