Effect of Sodium Silicate on Properties of Magnesia Inorganic Lightweight Materials

Abstract:

Magnesia inorganic lightweight material was prepared by using magnesium cementitious materials as raw materials, sodium silicate solution as modifier, hydrogen peroxide solution as foaming agent, manganese dioxide as activator, calcium stearate as stabilizer and polyacrylamide as thickener in this paper. The effects of sodium silicate addition on the apparent density, mechanical strength, pore structure, crystalline phase and water resistance of magnesia inorganic lightweight material were discussed. The results show that when the content of sodium silicate is 7.5‰, the pore structure presents better morphology and the crystallization contains more 5·1·8 phases (strength phase). At this moment, the compressive strength and bending strength of the composite reached 10.35 MPa and 2.22 MPa, respectively. When the addition of sodium silicate exceeded 7.5‰, SEM and EDS presented that a large amount of sodium silicate and perforation appeared in the pores, meanwhile large number of perforations occurred between pores. XRD showed that the 5·1·8 phases and 3·1·8 phases in the materials changed into Mg (OH)₂ crystals. These results in a significant decrease in material properties. Keywords: Magnesium cementitious material; Sodium silicate; Inorganic light materials; Pore structure

• Periodical: Materials Science Forum (Volume 956)
• Pages: 342-351
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.956.342
• Online since: June 2019
• Authors: Jian Wang, Yi Qiang Wu, Jun Hua Xiao, Ming Liu, Xin Li Zhang, Hong Jun Chen, Ying Feng Zuo*
• Keywords: Inorganic Light Materials, Magnesium Cementitious Material, Pore Structure, Sodium Silicate

References

[1] LIU X D Research on Energy 4.0 Transformation Path in the Background of Energy Internet[J]. Ecological Economy, 2018,34(06):89-93+99. (in Chinese).

[2] ZHOU X Y, LI J, ZHOU D G. Simulation evaluation of the heat-conducting property of wheat straw-based sandwich wallboard[J]. Scientia Silvae Sinicae, 2007, 43(2): 24-26. (in Chinese).

[3] ZHANG M, TIAN Q B, XU L, et al. Status and Prospects of Research on Foamed Cement[J]. Bulietin of the Chinese Ceramic Society, 2014, 33(10): 2547-2551. (in Chinese).

[4] Guidance for development of building materials industry in 13th Five-Year[J]. China Building Materials. (in Chinese).

[5] Sorrel S., 1867. On a new magnesium cement. C R Acad Sci. 65:102–4.

[6] Kearsley E P, Wainwright P J. The effect of high fly ash content on the compressive strength of foamed concrete[J]. Cement and concrete research, 2001, 31(1): 105-112.

DOI: 10.1016/s0008-8846(00)00430-0

[7] Sglavo V M, De Genua F, Conci A, et al. Influence of curing temperature on the evolution of magnesium oxychloride cement[J]. Journal of materials science, 2011, 46(20): 6726.

DOI: 10.1007/s10853-011-5628-z

[8] Chau C K, Chan J, Li Z. Influences of fly ash on magnesium oxychloride mortar[J]. Cement and Concrete Composites, 2009, 31(4): 250-254.

DOI: 10.1016/j.cemconcomp.2009.02.011

[9] Shuiping W, Rui W, Yingdan Z, et al. Effects of EVA latex on the properties of glass-fiber/magnesium-oxychloride cement composites[J]. Journal of Wuhan University of Technology--Materials Science Edition, 2006, 21(1): 138-142.

DOI: 10.1007/bf02861492

[10] LI Y, LI Z J, PEI H F, et al.The influence of Fe SO4and KH2PO4on the performance of magnesium oxychloride cement[J].Construction and Building Materials, 2016 (102) :233-238.

DOI: 10.1016/j.conbuildmat.2015.10.186

[11] WANG J, XIAO J H, ZUO Y F, et al. Preparation and properties of straw/magnesium oxychloride inorganic light mass composites[J]. Acta Materiae Compositae Sinica, 2018, 35 (in Chinese).

[12] ZUO Y F, WANG J, XIAO J H, et al. Modulation of strength and pore structure of magnesium inorganic foaming material[J]. Journal of Building Materials, 2018,21(03):394-401. (in Chinese).

[13] XIAO J H, ZHAN M J, CHEN X L, et al. Effect of hydrogen peroxide on properties and pore structure of magnesium inorganic foam materials[J], Materials Review, 2017,31(24):96-100+104. (in Chinese).

[14] XU Y F, LIU X, TANG G T, HAO D K. Preparation and performance of novel water gless/polyurethane crack sealant[J]. Chemical Propellants & Polymeric Materials, 2017,15(04):88-92. (in Chinese).

[15] Kearsley E P, Wainwright P J. The effect of high fly ash content on the compressive strength of foamed concrete[J]. Cement and concrete research, 2001, 31(1): 105-112.

DOI: 10.1016/s0008-8846(00)00430-0

[16] PENG J Z, PENG X Q. A review on structure and properties of aerated concrete[J]. Materials Review, 2011, 25(1): 89-93. (in Chinese).