Regulation for compressive strength and pore structure of geopolymer
YANG Lirong
ZHANG Haohao
WANG Chunmei
LIU Zhigang
ZHOU Tingting
FENG Xiaoxin
Abstract：Using metakaolin and water glass as raw materials,the influence of H2O/Na2O,Na2O/Al2O3 and ultrasonic action on the compressive strength of geopolymers were investigated,and the regulation of pore structure by H2O/Na2O,cetyltrimethylammonium bromide(CTAB)and ultrasonic action was discussed by nitrogen adsorption method.The results show that with the increase of H2O/Na2O,the compressive strength of geopolymer decreases gradually,but it is beneficial to form large pores.With the increase of Na2O/Al2O3,the compressive strength first increases and then decreases.The closer the initial time of ultrasound is to the final set-ting time,the lower the compressive strength is.The addition of CTAB is conducive to the formation of 3～5 nm pores.Compared with the samples with the later ultrasonic starting time,the ultrasonic action will reduce the large pores around 120 nm when the slurry is 1/2 of the initial setting time,and the longer the ultrasonic duration,the more pores of the gel at 3～5 nm.With the syn-ergistic effect of ultrasound and CTAB,the number of mesopores about 40 nm and large pores about 120 nm appear and the pore shape is mostly cylindrical.
Keywords：geopolymercompressive strengthpore size distributionnitrogen adsorption method
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 18-23,68 )