Solid-Liquid Equilibrium Equation of Cement-Based Materials under Leaching of Ammonium Chloride

Abstract

Abstract: The solid-liquid equilibrium curve of Portland cement system in 6 mol/L ammonium chloride solution was experimentally obtained using the dissolving equilibrium between cement paste powders and simulated pore solutions. The obtained equilibrium curve in nitrate solution has a similar three-stage form to that in water. The leaching mechanism of ammonium chloride solution on cement-based materials is similar to that of deionized water solution. In addition, leaching process of ammonium chloride solution is accompanied by the leaching of other solid elements (including sulfur and magnesium). And its dissolution loss has three stages, which is similar to solid phase calcium, but solid phase Al and Fe basically do not dissolve.

Key words: cement-based material, ammonium chloride, leaching, solid-liquid equilibrium curve

CLC Number:

TU528.01

TANG Yujuan, ZUO Xiaobao, YIN Guangji, TONG Xiaofang, XU Fei. Solid-Liquid Equilibrium Equation of Cement-Based Materials under Leaching of Ammonium Chloride[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 741-749.

References

[1] YANG H, CHE Y, LENG F. Calcium leaching behavior of cementitious materials in hydrochloric acid solution[J]. Sci Rep, 2018, 8(1): 8806.
[2] LIU L, WANG X C, ZHOU J, et al. Investigation of pore structure and mechanical property of cement paste subjected to the coupled action of freezing/thawing and calcium leaching[J]. Cement and Concrete Research, 2018, 109: 133-146.
[3] LIN W T, CHENG A, HUANG R, et al. Effect of calcium leaching on the properties of cement-based composites[J]. Journal of Wuhan University of Technology-Mater Sci Ed, 2011, 26(5): 990-997.
[4] SARKAR S, MAHADEVAN S, MEEUSSEN J C L, et al. Sensitivity analysis of damage in cement materials under sulfate attack and calcium leaching[J]. Journal of Materials in Civil Engineering, 2012, 24(4): 430-440.
[5] ROZIÈRE E, LOUKILI A. Performance-based assessment of concrete resistance to leaching[J]. Cement and Concrete Composites, 2011, 33(4): 451-456.
[6] GLASSER F P, MARCHAND J, SAMSON E. Durability of concrete—degradation phenomena involving detrimental chemical reactions[J]. Cement and Concrete Research, 2008, 38(2): 226-246.
[7] SAITO H, DEGUCHI A. Leaching tests on different mortars using accelerated electrochemical method[J]. Cement and Concrete Research, 2000, 30(11): 1815-1825.
[8] RICHARDSON C. Experimental researches on the constitution of hydraulic mortars[J]. Journal of the American Chemical Society, 1905, 27(8): 1028-1029.
[9] HAGA K, SUTOU S, HIRONAGA M, et al. Effects of porosity on leaching of Ca from hardened ordinary Portland cement paste[J]. Cement and Concrete Research, 2005, 35(9): 1764-1775.
[10] BERTRON A, DUCHESNE J, ESCADEILLAS G. Accelerated tests of hardened cement pastes alteration by organic acids: analysis of the pH effect[J]. Cement and Concrete Research, 2005, 35(1): 155-166.
[11] HIDALGO A, PETIT S, DOMINGO C, et al. Microstructural characterization of leaching effects in cement pastes due to neutralisation of their alkaline nature: part I: Portland cement pastes[J]. Cement and Concrete Research, 2007, 37(1): 63-70.
[12] ULM F J, LEMARCHAND E, HEUKAMP F H. Elements of chemomechanics of calcium leaching of cement-based materials at different scales[J]. Engineering Fracture Mechanics, 2003, 70(7/8): 871-889.
[13] NAKARAI K, ISHIDA T, MAEKAWA K. Modeling of calcium leaching from cement hydrates coupled with micro-pore formation[J]. Journal of Advanced Concrete Technology, 2006, 4(3): 395-407.
[14] YANG H, JIANG L H, ZHANG Y, et al. Predicting the calcium leaching behavior of cement pastes in aggressive environments[J]. Construction and Building Materials, 2012, 29: 88-96.
[15] CHEN J J, THOMAS J J, TAYLOR H F W, et al. Solubility and structure of calcium silicate hydrate[J]. Cement and Concrete Research, 2004, 34(9): 1499-1519.
[16] DAMIDOT D, LOTHENBACH B, HERFORT D, et al. Thermodynamics and cement science[J]. Cement and Concrete Research, 2011, 41(7): 679-695.
[17] JAIN J, NEITHALATH N. Analysis of calcium leaching behavior of plain and modified cement pastes in pure water[J]. Cement and Concrete Composites, 2009, 31(3): 176-185.
[18] JENNINGS H M. Aqueous solubility relationships for two types of calcium silicate hydrate[J]. Journal of the American Ceramic Society, 1986, 69(8): 614-618.
[19] WAN K S, LI Y, SUN W. Experimental and modelling research of the accelerated calcium leaching of cement paste in ammonium nitrate solution[J]. Construction and Building Materials, 2013, 40: 832-846.
[20] BEJAOUI S, BARY B. Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model[J]. Cement and Concrete Research, 2007, 37(3): 469-480.
[21] HEUKAMP F H, ULM F J, GERMAINE J T. Mechanical properties of calcium-leached cement pastes: triaxial stress states and the influence of the pore pressures[J]. Cement and Concrete Research, 2001, 31(5): 767-774.
[22] TANG Y J,ZUO X B,HE S L, et al. Influence of slag content and water-binder ratio on leaching behavior of cement pastes[J]. Construction and Building Materials, 2016, 129: 61-69.
[23] BERNER U R. Modelling the incongruent dissolution of hydrated cement minerals[J]. Radiochimica Acta, 1988, 44/45(2): 387-394.
[24] BUIL M, REVERTEGAT E, OLIVER J. A model of the attack of pure water or undersaturated lime solutions on cement[J]. Stabilization and Solidification of Hazardous Radioactive and Mixed Wastes, 1992(2): 227-241.
[25] WAN K S, LI L, SUN W. Solid-liquid equilibrium curve of calcium in 6 mol/L ammonium nitrate solution[J]. Cement and Concrete Research, 2013, 53: 44-50.
[26] PUERTAS F, GOÑI S, HERNÁNDEZ M S, et al. Comparative study of accelerated decalcification process among C₃S, grey and white cement pastes[J]. Cement and Concrete Composites, 2012, 34(3): 384-391.
[27] CHEN J J, THOMAS J J, JENNINGS H M. Decalcification shrinkage of cement paste[J]. Cement and Concrete Research, 2006, 36(5): 801-809.
[28] CARDE C, FRANÇOIS R, TORRENTI J M. Leaching of both calcium hydroxide and C-S-H from cement paste: modeling the mechanical behavior[J]. Cement and Concrete Research, 1996, 26(8): 1257-1268.