Effect of HPMC on Rheological Properties of PC-CSA Composite Pastes and Its Mechanism Analysis
GUO Chuanchuan
CHEN Ning
WANG Ru
Abstract：The effect and its mechanism of high and low viscosity hydroxypropyl methylcellulose(HPMC)on the rheological properties of Portland cement(PC)-calcium sulfoaluminate cement(CSA)composite pastes were investigated.The results indicate that the adsorption of HPMC on the surface of cement particles and its enhancement in the dynamic viscosity of the pore solution hinder particle migration,thereby increasing the initial apparent viscosity of the composite pastes.The higher the dosage of HPMC,the higher the initial apparent viscosity.The initial apparent viscosity of the composite paste modified with high viscosity HPMC is even higher than that of low viscosity HPMC.Over time,HPMC gradually absorbs water and swells,resulting in a gradual increase in the apparent viscosity of the modified pastes.The water absorption capacity of HPMC is affected by the properties of the pore solution.For low viscosity and low dosage HPMC-modified paste,the dynamic viscosity of the pore solution is low,resulting in smaller transport resistance to solution within the pores,making it easier for HPMC to absorb water.However,the dynamic viscosity of the pore solution in a high viscosity and high dosage HPMC-modified paste is relatively high,leading to increased trasport resistance to solution within the pores,which hinders the water absorption of HPMC.
Keywords：Portland cementcalcium sulfoaluminate cementhydroxypropyl methylcelluloserheological propertymechanism analysis
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 236-243 )