LDHs对超硫酸盐水泥抗碳化性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0187

摘要/Abstract

摘要： 为有效提升超硫酸盐水泥(SSC)的抗碳化性能,掺入2%(质量分数)实验室合成的层状双氢氧化物(LDHs)并与相同掺量的偏铝酸钠(NaAlO₂)、氢氧化钠(NaOH)及乳酸钠(C₃H₅O₃Na)三种外加剂进行对比。采用压汞法(MIP)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、热重测试(TG-DTG)及扫描电子显微镜(SEM)等表征手段,探讨了LDHs对SSC混凝土水化产物组成、孔隙结构特征及抗碳化性能的作用机理。结果表明,添加LDHs的SSC混凝土28 d抗压强度最高,达40.6 MPa。SSC混凝土28 d碳化深度为22.7 mm,加入LDHs后碳化深度降至14.6 mm,加入NaAlO₂、乳酸钠和NaOH的SSC混凝土碳化深度分别为21.4、17.2和24.5 mm。LDHs有利于SSC混凝土形成更多水化产物,使混凝土总孔隙率降低了6.28%。LDHs的加入有效提高了SSC混凝土的力学性能和抗碳化性能,乳酸钠和NaAlO₂的效果次于LDHs,而NaOH则无改善作用。LDHs提高了SSC混凝土水化程度,细化了孔隙结构,致密的微观结构有助于力学性能及抗碳化性能的提升。

关键词: 超硫酸盐水泥, 层状双氢氧化物, 碳化深度, 孔隙结构, 力学性能

Abstract: To effectively enhance the carbonation resistance of supersulfated cement (SSC), 2% (mass fraction) of experimentally synthesized layered double hydroxides (LDHs) was added and compared with the same dosage of three admixtures: sodium aluminate (NaAlO₂), sodium hydroxide (NaOH), and sodium lactate (C₃H₅O₃Na). The effects of LDHs on the composition of hydration products, pore structure characteristics, and carbonation resistance of SSC concrete were investigated by means of mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric test (TG-DTG), and scanning electron microscopy (SEM). The results show that the 28 d compressive strength of SSC concrete with LDHs addition is the highest, reaching 40.6 MPa. The 28 d carbonation depth of SSC concrete is 22.7 mm, which is reduced to 14.6 mm with LDHs addition. The carbonation depths of SSC concrete with NaAlO₂, sodium lactate, and NaOH additions are 21.4, 17.2 and 24.5 mm, respectively. LDHs facilitate the formation of more hydration products in SSC concrete, reducing the total porosity of concrete by 6.28%. The addition of LDHs effectively improves the mechanical properties and carbonation resistance of SSC concrete. Sodium lactate and NaAlO₂ have a secondary effect compared to LDHs, while NaOH has no improvement effect. LDHs increase the degree of SSC concrete hydration and refine the pore structure. The dense concrete structure is conducive to the improvement of mechanical properties and carbonation resistance.

Key words: supersulfated cement, layered double hydroxide, carbonation depth, pore structure, mechanical property

中图分类号:

TU528

王嘉伟, 李传海, 张冲, 张秀芝. LDHs对超硫酸盐水泥抗碳化性能的影响[J]. 硅酸盐通报, 2025, 44(8): 2790-2800.

WANG Jiawei, LI Chuanhai, ZHANG Chong, ZHANG Xiuzhi. Effects of LDHs on Carbonation Resistance of Supersulfated Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2790-2800.

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