[2] [2] TANG S W, YAO Y, ANDRADE C, et al. Recent durability studies on concrete structure［J］. Cement and Concrete Research, 2015, 78: 143-154.

[3] [3] OTIENO M, BEUSHAUSEN H, ALEXANDER M. Chloride-induced corrosion of steel in cracked concrete-part I: experimental studies under accelerated and natural marine environments［J］. Cement and Concrete Research, 2016, 79: 373-385.

[4] [4] XIONG C S, LI W H, JIN Z Q, et al. Preparation of phytic acid conversion coating and corrosion protection performances for steel in chlorinated simulated concrete pore solution［J］. Corrosion Science, 2018, 139: 275-288.

[5] [5] JIN Z Q, CHANG H L, DU F Y, et al. Influence of SAP on the chloride penetration and corrosion behavior of steel bar in concrete［J］. Corrosion Science, 2020, 171: 108714.

[6] [6] CHEN C, JIANG L H, GUO M Z, et al. Effect of sulfate ions on corrosion of reinforced steel treated by DNA corrosion inhibitor in simulated concrete pore solution［J］. Construction and Building Materials, 2019, 228: 116752.

[7] [7] GOMES C, MIR Z M, BASTOS A C, et al. Effect of layered double hydroxides on the performance and service life of reinforced concrete［C］// Conference on Durable Concrete for Infrastructure under Severe Conditions-Smart Admixtures, Self-Responsiveness and Nanoadditions, Ghent, Belgium, September, 2019, 10-11.

[8] [8] MIR Z M, BASTOS A, HCHE D, et al. Recent advances on the application of layered double hydroxides in concrete-a review［J］. Materials (Basel, Switzerland), 2020, 13(6): 1426.

[9] [9] TATEMATSU H, SASAKI T. Repair materials system for chloride-induced corrosion of reinforcing bars［J］. Cement and Concrete Composites, 2003, 25(1): 123-129.

[10] [10] RAKI L, BEAUDOIN J J, MITCHELL L. Layered double hydroxide-like materials: nanocomposites for use in concrete［J］. Cement and Concrete Research, 2004, 34(9): 1717-1724.

[11] [11] HONG S X, QIN S F, LIU Z M, et al. Enhanced corrosion resistance and applicability of Mg/Al-CO2-3 layered double hydroxide film on Q235 steel substrate［J］. Construction and Building Materials, 2021, 276: 122259.

[12] [12] CHEN M Z, WEI Y N, ZHENG H B, et al. Ca-LDH-modified cementitious coating to enhance corrosion resistance of steel bars［J］. Journal of Building Engineering, 2022, 51: 104301.

[13] [13] OESTREICHER V, JOBBGY M, REGAZZONI A E. Halide exchange on Mg(II)-Al(III) layered double hydroxides: exploring affinities and electrostatic predictive models［J］. Langmuir: the ACS Journal of Surfaces and Colloids, 2014, 30(28): 8408-8415.

[14] [14] SJSTAD A O, ANDERSEN N H, VAJEESTON P, et al. On the thermal stability and structures of layered double hydroxides Mg1-xAlx(OH)2(NO3)x·mH2O (0.18≤x≤0.38)［J］. European Journal of Inorganic Chemistry, 2015, 2015(10): 1775-1788.

[15] [15] YANG Z X, FISCHER H, CEREZO J, et al. Aminobenzoate modified MgAl hydrotalcites as a novel smart additive of reinforced concrete for anticorrosion applications［J］. Construction and Building Materials, 2013, 47: 1436-1443.

[17] [17] BALONIS M, GLASSER F P. Calcium nitrite corrosion inhibitor in Portland cement: influence of nitrite on chloride binding and mineralogy［J］. Journal of the American Ceramic Society, 2011, 94(7): 2230-2241.

[18] [18] YE H L. Autogenous formation and smart behaviors of nitrite- and nitrate-intercalated layered double hydroxides (LDHs) in Portland cement-metakaolin-dolomite blends［J］. Cement and Concrete Research, 2021, 139: 106267.

[19] [19] COSTA D G, ROCHA A B, SOUZA W F, et al. Comparative structural, thermodynamic and electronic analyses of Zn-Al-An- hydrotalcite-like compounds (An-=Cl-, F-, Br-, OH-, CO2-3 or NO-3): an ab initio study［J］. Applied Clay Science, 2012, 56: 16-22.

[20] [20] NEVILLE A. Chloride attack of reinforced concrete: an overview［J］. Materials and Structures, 1995, 28(2): 63-70.

[21] [21] JUSTNE H. A review of chloride binding in cementitious systems［J］. Nordic Concrete Research, 1998, 21: 48-63.

[22] [22] PROVIS J L, BERNAL S A. Geopolymers and related alkali-activated materials［J］. Annual Review of Materials Research, 2014, 44: 299-327.

[23] [23] BERNAL S A, SAN NICOLAS R, MYERS R J, et al. MgO content of slag controls phase evolution and structural changes induced by accelerated carbonation in alkali-activated binders［J］. Cement and Concrete Research, 2014, 57: 33-43.

[25] [25] VACCARI A. Layered double hydroxides: present and future［J］. Applied Clay Science, 2002, 22(1/2): 75-76.

[26] [26] DUAN X, EVANS D G. Layered double hydroxides: application of layered double hydroxides［J］. Structure and Bonding, 2006, 119: 193-223.

[28] [28] CAO L, GUO J T, TIAN J H, et al. Preparation of Ca/Al-layered double hydroxide and the influence of their structure on early strength of cement［J］. Construction and Building Materials, 2018, 184: 203-214.

[29] [29] LIU Z P, MA R Z, OSADA M, et al. Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide: assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies［J］. Journal of the American Chemical Society, 2006, 128(14): 4872-4880.

[32] [32] CHEN M Z, WU F, YU L W, et al. Chloride binding capacity of LDHs with various divalent cations and divalent to trivalent cation ratios in different solutions［J］. CrystEngComm, 2019, 21(44): 6790-6800.

[34] [34] VON HOESSLE F, PLANK J, LEROUX F. Intercalation of sulfonated melamine formaldehyde polycondensates into a hydrocalumite LDH structure［J］. Journal of Physics and Chemistry of Solids, 2015, 80: 112-117.

[35] [35] YANG Z, FISCHER H, CEREZO J, et al. Modified hydrotalcites for improved corrosion protection of reinforcing steel in concrete-preparation, characterization, and assessment in alkaline chloride solution［J］. Materials and Corrosion, 2016, 67(7): 721-738.

[37] [37] SHUI Z H, YU R, CHEN Y X, et al. Improvement of concrete carbonation resistance based on a structure modified layered double hydroxides (LDHs): experiments and mechanism analysis［J］. Construction and Building Materials, 2018, 176: 228-240.

[38] [38] HANG T T X, TRUC T A, DUONG N T, et al. Layered double hydroxides as containers of inhibitors in organic coatings for corrosion protection of carbon steel［J］. Progress in Organic Coatings, 2012, 74(2): 343-348.

[39] [39] NAKAYAMA H, WADA N, TSUHAKO M. Intercalation of amino acids and peptides into Mg-Al layered double hydroxide by reconstruction method［J］. International Journal of Pharmaceutics, 2004, 269(2): 469-478.

[40] [40] ZUO J D, WU B, LUO C Y, et al. Preparation of MgAl layered double hydroxides intercalated with nitrite ions and corrosion protection of steel bars in simulated carbonated concrete pore solution［J］. Corrosion Science, 2019, 152: 120-129.

[41] [41] XU J X, SONG Y B, ZHAO Y H, et al. Chloride removal and corrosion inhibitions of nitrate, nitrite-intercalated MgAl layered double hydroxides on steel in saturated calcium hydroxide solution［J］. Applied Clay Science, 2018, 163: 129-136.

[42] [42] XU J X, TAN Q P, MEI Y J. Corrosion protection of steel by Mg-Al layered double hydroxides in simulated concrete pore solution: effect of SO2-4［J］. Corrosion Science, 2020, 163: 108223.

[43] [43] CHEN Y X, SHUI Z H, CHEN W, et al. Chloride binding of synthetic Ca-Al-NO3 LDHs in hardened cement paste［J］. Construction and Building Materials, 2015, 93: 1051-1058.

[44] [44] YOON S, MOON J, BAE S, et al. Chloride adsorption by calcined layered double hydroxides in hardened Portland cement paste［J］. Materials Chemistry and Physics, 2014, 145(3): 376-386.

[49] [49] RAJAMALLU C, CHANDRASEKHAR REDDY T, ARUNAKANTHI E. Service life prediction of self compacted concretes with respect to chloride ion penetration［J］. Materials Today: Proceedings, 2021, 46: 677-681.

[52] [52] MA J T, DUAN P, REN D M, et al. Effects of layered double hydroxides incorporation on carbonation resistance of cementitious materials［J］. Journal of Materials Research and Technology, 2019, 8(1): 292-298.

[53] [53] LIU T, CHEN Y X, YU Q L, et al. Effect of MgO, Mg-Al-NO3 LDH and calcined LDH-CO3 on chloride resistance of alkali activated fly ash and slag blends［J］. Construction and Building Materials, 2020, 250: 118865.

[55] [55] WANG J, HUANG B, MAO Z Y, et al. Study on adsorption properties of calcined Mg-Al hydrotalcite for sulfate ion and chloride ion in cement paste［J］. Materials (Basel, Switzerland), 2021, 14(4): 994.

[59] [59] HU Y R, LI H H, WANG Q, et al. Characterization of LDHs prepared with different activity MgO and resisting Cl- attack of concrete in salt lake brine［J］. Construction and Building Materials, 2019, 229: 116921.

[60] [60] YANG Z X, FISCHER H, POLDER R. Laboratory investigation of the influence of two types of modified hydrotalcites on chloride ingress into cement mortar［J］. Cement and Concrete Composites, 2015, 58: 105-113.

[61] [61] MA J T, WANG D G, CHEN H, et al. Chloride absorption behavior of layered double hydroxides in chloride environment［J］. Journal of Testing and Evaluation, 2020, 48(3): 20190062.

[62] [62] WANG X H, XU J X, TAN Q P. Effect of nitrite intercalated Mg-Al layered double hydroxides on mortar durability under Cl- and SO2-4 coexisting environment［J］. Journal of Central South University, 2022, 29(2): 546-560.

[63] [63] PARKER L M, MILESTONE N B, NEWMAN R H. The use of hydrotalcite as an anion absorbent［J］. Industrial & Engineering Chemistry Research, 1995, 34(4): 1196-1202.

[64] [64] TSUJIMURA A, UCHIDA M, OKUWAKI A. Synthesis and sulfate ion-exchange properties of a hydrotalcite-like compound intercalated by chloride ions［J］. Journal of Hazardous Materials, 2007, 143(1/2): 582-586.

[65] [65] CAO Y H, DONG S G, ZHENG D J, et al. Multifunctional inhibition based on layered double hydroxides to comprehensively control corrosion of carbon steel in concrete［J］. Corrosion Science, 2017, 126: 166-179.

[66] [66] CHEN Z J, YE H L. Sequestration and release of nitrite and nitrate in alkali-activated slag: a route toward smart corrosion control［J］. Cement and Concrete Research, 2021, 143: 106398.

[67] [67] YANG L, CHEN M X, LU Z Y, et al. Synthesis of CaFeAl layered double hydroxides 2D nanosheets and the adsorption behaviour of chloride in simulated marine concrete［J］. Cement and Concrete Composites, 2020, 114: 103817.

[68] [68] GOMES C, MIR Z, SAMPAIO R, et al. Use of ZnAl-layered double hydroxide (LDH) to extend the service life of reinforced concrete［J］. Materials (Basel, Switzerland), 2020, 13(7): 1769.

[69] [69] CAO Y H, ZHENG D J, ZHANG F, et al. Layered double hydroxide (LDH) for multi-functionalized corrosion protection of metals: a review［J］. Journal of Materials Science & Technology, 2022, 102: 232-263.

[71] [71] KE X Y, BERNAL S A, PROVIS J L. Uptake of chloride and carbonate by Mg-Al and Ca-Al layered double hydroxides in simulated pore solutions of alkali-activated slag cement［J］. Cement and Concrete Research, 2017, 100: 1-13.

[72] [72] KAYALI O, KHAN M S H, SHARFUDDIN AHMED M. The role of hydrotalcite in chloride binding and corrosion protection in concretes with ground granulated blast furnace slag［J］. Cement and Concrete Composites, 2012, 34(8): 936-945.