Properties and Mechanism of Action of Lime Modified by Organic-Inorganic Hybrid
DU Yun
LIU Zixian
XU Gelong
BAI Jinpeng
CAI Jiwei
Abstract：To identify an effective restoration material for masonry structures,lime was separately modified by three organic additives such as pre-gelatinized corn starch,anionic polyacrylamide(APAM)and alkalized straw powder in combination with NaHCO₃.The effects of three organic additives on the physical properties,compressive strength and microscopic mechanism of lime were systematically investigated.The results indicate that 7%pre-gelatinized corn starch exhibits superior performance compared to two organic additives,effectively decelerating water evaporation and prolonging the carbonation period of lime.Compared to the control group,the lime modified by 7%pre-gelatinized corn starch exhibits reduction of 96.81%,75.73%,85.80%and 30.91%in 28 d capillary water absorption,drying rate,water absorption and porosity.Concurrently,its softening coefficient and compressive strength increase by 78.05%and 985.23%,with a slight increase in its apparent density.—OH groups in pre-gelatinized corn starch can modulate the crystallization of CaCO₃,and the structure of the lime after carbonation is denser.The lime modified by 7%pre-gelatinized corn starch achieves optimal performance in masonry repair.
Keywords：restoration materialcorn starchlimecomposite modification
Publication Date：2025-12-30
Online Publishing Date：2026-01-08(First online date of this platform, not the publication date of the document)
Pages：7( 1284-1290 )