Effect of LDHs on Early Hydration and Mechanical Properties of Carbonate Activated Cementitious Material

Abstract

Abstract: Carbonate activated cementitious materials have the characteristics of low environmental impact, easy operation, and good material properties. Slow early age strength development limits its application for practical engineering. In this study, layered double hydroxides (LDHs) were used as the key material to promote the early-age performance of sodium carbonate activated slag. Combined with material characterization, isothermal calorimetry, XRD, TG-DTG, SEM and mercury intrusion porosimetry (MIP), the effect of LDHs on early age hydration reaction and products were systematically analyzed. The results show that with the increase of LDHs content, the hydration rate of sodium carbonate activated slag increases significantly. LDHs acts as a nanocrystalline nucleus site and facilitates the growth of hydrotalcite and C-S-H gels, which accelerates the formation of main hydration products in the early stage of sodium carbonate activated slag. The pore structure of the sample is improved in the early stage of hydration, and 1 d compressive strength reach up to 22 MPa.

Key words: LDHs, alkali-activated, sodium carbonate, slag, pore structure, early property, hydration reaction

CLC Number:

TU528

YUAN Bo, WANG Hengkun, CHEN Wei, TANG Pei. Effect of LDHs on Early Hydration and Mechanical Properties of Carbonate Activated Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1696-1703.

References

[1] 赵瑞,史才军,王小刚,等.碱激发胶凝材料与硅酸盐水泥基材料碱骨料反应的比较[J].硅酸盐通报,2013,32(9):1794-1799.
ZHAO R, SHI C J, WANG X G, et al. Comparison on alkali-aggregate reaction in alkali-activated binders and ordinary Portland cement-based materials[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(9): 1794-1799 (in Chinese).
[2] 万暑,史才军,姜磊,等.碱激发胶凝材料中碱硅反应研究进展[J].硅酸盐通报,2015,34(11):3214-3221.
WAN S, SHI C J, JIANG L, et al. Research progress of alkali-silica reaction in alkali-activated materials[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(11): 3214-3221 (in Chinese).
[3] 王新.碳酸钠对碱矿渣水泥性能的影响研究[D].重庆:重庆大学,2016.
WANG X. Investigation of effect of sodium carbonate on properties of alkali-activated slag cement[D]. Chongqing: Chongqing University, 2016 (in Chinese).
[4] BERNAL S A, PROVIS J L, MYERS R J, et al. Role of carbonates in the chemical evolution of sodium carbonate-activated slag binders[J]. Materials and Structures, 2015, 48(3): 517-529.
[5] BERNAL S A, NICOLAS R S, VAN DEVENTER J S J, et al. Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator[J]. Advances in Cement Research, 2016, 28(4): 262-273.
[6] FERNÁNDEZ-JIMÉNEZ A, PUERTAS F. Effect of activator mix on the hydration and strength behaviour of alkali-activated slag cements[J]. Advances in Cement Research, 2003, 15(3): 129-136.
[7] YUAN B, YU Q L, BROUWERS H J H. Evaluation of slag characteristics on the reaction kinetics and mechanical properties of Na₂CO₃ activated slag[J]. Construction and Building Materials, 2017, 131: 334-346.
[8] 辛东升.单组份生/熟石灰与碳酸钠激发矿渣胶凝材料的制备及其机理研究[D].福州:福州大学,2018.
XIN D S. Study on preparation and mechanism of one-part alkali-activated slag cementitious material with quicklime, slaked lime and sodium carbonate[D]. Fuzhou: Fuzhou University, 2018 (in Chinese).
[9] AKTURK B, KIZILKANAT A B, KABAY N. Effect of calcium hydroxide on fresh state behavior of sodium carbonate activated blast furnace slag pastes[J]. Construction and Building Materials, 2019, 212: 388-399.
[10] KE X Y, BERNAL S A, PROVIS J L. Controlling the reaction kinetics of sodium carbonate-activated slag cements using calcined layered double hydroxides[J]. Cement and Concrete Research, 2016, 81: 24-37.
[11] LING X, SCHOLLBACH K, LIU G, et al. The utilization of waste incineration filter dust (WIFD) in sodium carbonate activated slag mortars[J]. Construction and Building Materials, 2021, 313: 125494.
[12] YANG T, ZHANG Z H, ZHU H J, et al. Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements[J]. Construction and Building Materials, 2019, 211: 329-336.
[13] ZHANG J L, WANG Z M, YAO Y H, et al. The effect and mechanism of C-S-H-PCE nanocomposites on the early strength of mortar under different water-to-cement ratio[J]. Journal of Building Engineering, 2021, 44: 103360.
[14] GOLEWSKI G L, SZOSTAK B. Strengthening the very early-age structure of cementitious composites with coal fly ash via incorporating a novel nanoadmixture based on C-S-H phase activators[J]. Construction and Building Materials, 2021, 312: 125426.
[15] YANG H, XIONG C S, LIU A, et al. The effect of layered double hydroxides intercalated with vitamin B3 on the mechanical properties, hydration and pore structure of cement-based materials[J]. Materials Letters, 2021, 300: 130228.
[16] SARGAM Y, WANG K J. Hydration kinetics and activation energy of cement pastes containing various nanoparticles[J]. Composites Part B: Engineering, 2021, 216: 108836.
[17] HUBLER M H, THOMAS J J, JENNINGS H M. Influence of nucleation seeding on the hydration kinetics and compressive strength of alkali activated slag paste[J]. Cement and Concrete Research, 2011, 41(8): 842-846.
[18] MENG T, HONG Y P, WEI H D, et al. Effect of nano-SiO₂ with different particle size on the hydration kinetics of cement[J]. Thermochimica Acta, 2019, 675: 127-133.
[19] YUAN B, YU Q L, BROUWERS H J H. Time-dependent characterization of Na₂CO₃ activated slag[J]. Cement and Concrete Composites, 2017, 84: 188-197.
[20] ZHU J, ZENG B, MO L W, et al. One-pot synthesis of Mg-Al layered double hydroxide (LDH) using MgO and metakaolin (MK) as precursors[J]. Applied Clay Science, 2021, 206: 106070.
[21] 于洪波,徐冰,边令喜,等.机械化学法制备Mg-Al-CO₃ LDHs及其合成机理探讨[J].硅酸盐通报,2010,29(4):829-833.
YU H B, XU B, BIAN L X, et al. Mechanochemical synthesis and formation mechanism of Mg-Al-CO₃ layered double hydroxides[J]. Bulletin of the Chinese Ceramic Society, 2010, 29(4): 829-833 (in Chinese).