Effect of lime mud content on drying shrinkage of alkali slag/lime mud mortar
In order to efficiently use lime mud,which is a kind of industrial solid waste from paper industry solid waste,the effect of different lime mud content on the drying shrinkage of alkali-activated slag/lime mud mortar(ALM)was studied using potassium silicate and potassium carbonate as composite activators,lime mud and slag as composite precursors,respectively.The mechanism was investigated by X-ray diffraction,thermogravimetry-derivative thermogravimetry,and mercury intrusion porosimetry.The results showed that the amount of C-(A-)S-H gel of ALM decreased with the increasing of lime mud content,and the amount of hydrotalcite remains unchanged.Additionally,the amounts of aragonite,vaterite and calcite was also increased.However,the gel pore(3.12-10 nm)and mesopore(10-50 nm)decreased with the macropore(＞50 nm)increasing.Meanwhile,the water absorption of ALM,the water loss rate,and the nominal crystal-binder ratio were all increased.The compressive strength and drying shrinkage of ALM decreased.ALM with lime mud content of 20％possessed satisfactory 28-day compressive strength and drying shrinkage.
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