Effect of Ca-LDH Modified by Sodium Lignosulfonate on Properties of Cement-Based Materials

Abstract

Abstract: Layered double hydroxides (LDHs) are a new type of multifunctional two-dimensional nanomaterials. The hydration product (AFm phase) of cement belongs to the calcium-aluminum hydrotalcite series. Because of the excellent properties of LDHs, it has a broad application prospect in the field of building materials. Using sodium lignosulfonate as modifier, lignosulfonate modified LDHs (Ca-SLS-LDH) was synthesized by the hydrothermal synthesis method. The differences between the surface morphology, average particle size and specific surface area of Ca-LDH before and after modification were compared. The effects of different amounts of Ca-LDH on cement setting time, mortar fluidity and mechanical properties were studied, and the composition and microstructure of the cement hydration products were analyzed by SEM, XRD and mercury intrusion porosimetry (MIP). The results show that the average particle size of Ca-SLS-LDH is smaller, and the specific surface area is more than 60 times that of the unmodified Ca-LDH, when the content of LDHs does not exceed 4% (mass fraction), it can effectively improve the pore structure of the cement and promote the strength of the cement mortars, and the content of 6% (mass fraction) can cause the porosity to increase and the strength to decrease.

Key words: layered double hydroxides, sodium lignosulfonate, modification, cement, strength, pore structure

CLC Number:

TU528

CHEN Mengzhu, YU Linwen, YUAN Huihui, ZHENG Haibing, WU Fang, CAI Yuxin, LI Weihua. Effect of Ca-LDH Modified by Sodium Lignosulfonate on Properties of Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2152-2158.

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