硅酸盐通报2025，Vol.44Issue(8)：2790-2800,2813,12.DOI:10.16552/j.cnki.issn1001-1625.2025.0187
LDHs对超硫酸盐水泥抗碳化性能的影响
Effects of LDHs on Carbonation Resistance of Supersulfated Cement
摘要
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 mum 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.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Key words
supersulfated cement/layered double hydroxide/carbonation depth/pore structure/mechanical property分类
建筑与水利引用本文复制引用
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):2790-2800,2813,12.基金项目
国家自然科学基金(52178211) （52178211）
