Research on the mechanical properties and microstructural characteristics on bentonite-cement solidified sludge
The research on bentonite-cement solidified sludge will contribute to adapt to the times and achieve the"dual carbon"goals.With this aim,unconfined compressive strength tests and scanning electron microscopy(SEM)experiments were carried out on specimens with different mix ratios to investigate the influence of bentonite on the mechanical properties and microscopic characteristics of sludge.The results indicate that the strength of the specimens initially increases and then decreases with the increase of bentonite content,and the compressive strength reaches the maximum(2 MPa)when the bentonite content is 9%.The failure strain increases first and then decreases with the addition of bentonite,ranging from 1.5%to 3.9%.The elastic modulus increases with the increase of curing age,the maximum rise is 1.7 times.Deformation modulus(E50)is within the range of 30 to 100 times compressive strength.In addition,microstructural analysis indicates that as the bentonite content increases,the pore volume decreases significantly,and the specimen becomes more compact internally.
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