Research on the Quantitative Relationship Between the Uniaxial Compressive Strength of Filling Body and Amount of Hydration Products
To investigate the relationship between the strength of tailings filling bodies and the content of hydration products,mechanical experiments were initially performed to assess their uniaxial compressive strength.The content of various hydration products within the filling body test blocks was quantified using thermogravimetric-differential scanning calorimetry(TG-DSC)experiments.Subsequently,regression analysis was employed to examine the correlation between the uniaxial compressive strength of the filling body test blocks and the content of hydration products across different mass concentrations,thereby establishing the relationship between these variables.The results of the strength tests indicate that the early-age strength of the cement powder test block is significantly greater than that of the conventional Portland cement test block.However,this strength advantage diminishes over time.Nonetheless,at 28 days of age,the cement powder test block continues to exhibit superior strength compared to the ordinary Portland cement test block.Furthermore,the thermal analysis experiment reveals that the test block incorporating cementitious powder as the binding material undergoes three distinct weight loss stages during the heating process,corresponding to C-S-H dehydration,CaCO3 decomposition,and a weight loss peak temperature between 1 144℃and 1 176℃.The test block utilizing ordinary Portland cement as the cementitious material experiences weight loss across the aforementioned three stages and undergoes the decomposition of Ca(OH)2.Regression analysis indicates a strong linear correlation between the strength of the cementitious powder test block and its C-S-H content.Furthermore,the strength of the cement test blocks is associated with the levels of C-S-H and Ca(OH)2,with the influence of C-S-H content on strength being more pronounced than that of Ca(OH)2.
filling bodyuniaxial compressive strengthhydration productscomprehensive thermal analysisC-S-H gel
万方数据
维普
