Synthesis of calcium silicate hydrate based on steel slag with various alkalinities

Abstract

This study aimed to improve the hydraulic potential properties of the slag. Therefore, a method of dynamic hydrothermal synthesis was applied to synthesize calcium silicate hydrate. The phases and nanostructures were characterized by XRD, FTIR, TEM, and BET nitrogen adsorption. The influence of alkalinity of steel slag on its structures and properties was discussed. The experimental results show that, the main product is amorphous calcium silicate hydrate gel with flocculent or fibrous pattern with a BET specific surface area up to 77 m²/g and pore volume of 0.34 mL/g. Compared with low alkalinity steel slag, calcium silicate hydrate synthesized from higher alkalinity steel slag is prone to transform to tobermorite structure.

Keywords

calcium silicate hydrate / hydrothermal synthesis / steel slag / alkalinity

References

[1] Meng HD, Liu L Fractal Characteristics of Granularity Distribution of Ground Steel Slag[J]. Cem. Eng., 2009, 6: 23-29.

[2] Wu SP, Xue YJ, Ye QS, . Utilization of Steel Slag as Aggregates for Stone Mastic Asphalt (SMA) Mixtures[J]. Build. Environ., 2007, 42: 2 580-2 585.

[3] Zhang L, Wang F, Chen X Exploration on the Utilization and Development of Steel Slag[J]. iron & Steel Scrap of China, 2006, 1: 42-44.

[4] Li CH Study on the Development and Prospect of Recycling Technology of Steel Slag in China [J]. WisCo Tech., 2010, 48(4): 51-54.

[5] Wang Q, Yan PY, Feng JW A Discussion on Improving Hydration Activity of Steel Slag by Altering Its Mineral Compositions [J]. J. Hazard. Mater., 2011, 186: 1 070-1 075.

[6] Mason B The Constitution of Basic Open-heath Slag [J]. J. Iron and Steel Inst., 1994, 11: 69

[7] Ouyang D, Xie YP, He JY Composition, Mineral Morphology and Cementitious Properties of Converter Slag [J]. J. Chin. Ceram. Soc., 1991, 19(6): 488-494.

[8] Xu GL, Qian GR, Lai ZY, . Study of Low-alkalinity Steel Slag Blended Oil Well Cement and Geothermal Cement Chemical Composition, Mineral Phase and Mineral Characteristic of Lowalkalinity Steel Slag [J]. J. Southwest. Inst. Tech., 2000, 15(1): 10-14.

[9] Bowker JC, Lupis CP, Flinn PA Structure Studies of Slags by Mössbauer Spectroscopy [J]. Can. Metall. Q., 1981, 20(1): 69-78.

[10] Shen WG, Zhou MK, Ma W, . Investigation on the Application of Steel-slag-fly Ash Phosphogypsum Solidified Material as Road Base Material [J]. J. Hazard. Mater., 2009, 164: 99-104.

[11] Wang Q, Yan PY Hydration Properties of Basic Oxygen Furnace Steel Slag [J]. Constr. Build. Mater., 2010, 24: 1 134-1 140.

[12] Kriskova L, Pontikes Y, Cizer O, . Effect of Mechanical Activation on the Hydraulic Properties of Stainless Steel Slag [J]. Cem. Concr. Res., 2012, 42: 778-788.

[13] Wang Q Research Progress in Activation of Steel Slag Activity [J]. Ready-mixed Concr., 2010 26-28.

[14] Ke CJ, Su DG Study on Activation for Steel-slag with Lower Alkalinity in Hydrothermal Condition [J]. Multipurpose Util. Miner. Resour., 2004, 12(6): 40-44.

[15] Qian GR, Sun DD, Tay HH, . Autoclave Properties of Kirschsteinite — based steel slag [J]. Cem. Concr. Res., 2002, 32: 1 377-1 382.

[16] Wang SP, Peng XQ, Tang LP, . Influence of Inorganic Admixtures on the 11 Å-tobermorite Formation Prepared from Steel Slags: XRD and FTIR Analysis [J]. Constr. Build. Mater., 2014 42-47.

[17] Peng XQ, Gu SY, Huang T, . Reinforcement of Hydrated Calcium Silicate Powder to Silicon Rubber [J]. J. Civ., Archit. & Environ. Eng., 2010, 32(5): 109-113.

[18] Zhang XX, Wei GS, Yu F Thermal Radiative Properties of Xonolite Insulation Materials [J]. J. Therm. Sci., 2005, 14(3): 281-284.

[19] Jing ZZ, Jin FM, Yamasaki N, . Hydrothermal Synthesis of a Novel Tobermorite-based Porous Material from Municipal Incineration Bottom Ash [J]. Ind. Eng. Chem. Res., 2007, 46: 2 657-2 660.

[20] Yang NR, Yue WH Handbook of Microscopy of Inorganic Nonmetallic Materials [M]. Wuhan, Wuhan University of Technology, 2000 65-90.

[21] Peng XQ, He LJ, Liu YM Hydrated Calcium Silicate with Nm-order Size Manufactured by Using Dynamic Autoclaved Technology [J]. J. Chongqing Univ. (Nat. Sci. Ed.), 2005, 28(5): 59-62.

[22] Ke CJ Hydrothermal Performance and Its Mechanism of Low Alkalinity Steel Slag in Autoclaved Condition [J]. J. Build. Mater., 2007, 10(2): 142-147.

[23] Mostafa NY, Kishar EA, Abo-El-Enein SA FTIR Study and Cation Exchange Capacity of Fe³⁺ and Mg²⁺ -substituted Calcium Silicate Hydrates [J]. J. Alloy. Compd., 2009, 473: 538-542.

[24] Yuan RZ, Tan DL Study on Surface Characteristic of Hydrated Calcium Silicates [J]. J. Chin. Ceram. Soc., 1988, 16(6): 489-493.

[25] Cang H, Wang ZY, Zhang GC, . Effect of Surface Morphology of Fine Quartz on the Hollow Secondary Particles of Xonotlite [J]. J. Inorganic Mater., 1999, 14(3): 431-436.

[26] Siauciunas R, Baltakys Formation of Gyrolite During Hydrothermal Synthesis in the Mix-tures of CaO and Amorphous SiO₂ or Quartz [J]. Cem. Concr. Res., 2004, 34: 2 029-2 036.

[27] Black L, Garbev K, Beuchle G, . X-ray Photoelectron Spectroscopic Investigation of Nanocrystalline Calcium Silicate Hydrates Synthsised by Reactive Milling [J]. Cem. Concr. Res., 2006, 6: 1 023-1 030.

[28] Richardson IG Tobermorite/jennite- and Tobermorite/Calcium Hydroxide-based Models for the Structure of C-S-H: Applicability to Hardened Pastes of Tricalcium Silicate, Dicalcium Silicate, Portland Cement, and Blends of Portlandcement with Blast-furnace Slag, Metakaolin, or Silica Fume [J]. Cem. Concr. Res., 2004, 34: 1 733-1 777.

[29] Yang Q Analysis on Microstructure and Primary Exploring of Contact Hardening Mechanism of C-S-H Superfine Powder Made with Hydrothermal Synthesis [D], 2008 Chongqing Chongqing University