This study explores the influence of different concentrations of humic acid and fulvic acid on basic magnesi-um sulfate cement.The results indicate that an increase in the concentration of humic acid and fulvic acid enhances the flu-idity of the cement matrix.Setting times,both initial and final,show improvement.Humic and fulvic acids have a low effect on the strength of cement at lower dosages small.Compressive and flexural strength exhibit a rising trend at humic acid concentrations of 0.3％and up to 0.5％.However,at concentrations of 0.7％,0.9％,and 1.1％,the strength decrea-ses.Concerning fulvic acid,the compressive and flexural strength increase at concentrations of 0.3％and up to 0.5％,but beyond the 0.5％threshold,there is a continuous decrease in strength.Microstructural analysis shows that at a concentra-tion of 0.5％,the matrix is dense,with small pore sizes and relatively orderly particle arrangements.Conversely,at a con-centration of 1.1％humic acid,there are fewer magnesium oxide particles,an increased number of cracks,and a relatively loose particle arrangement.The influence of the two acids on basic magnesium sulfate cement is mainly reflected in the in-hibition of the 5·1·7 phase,leading to an increase in magnesium carbonate content and the degradation of the cement matrix.
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