活性MgO碳化固化疏浚底泥强度变化的研究

Study on Strength Change of Activated Magnesium Oxide Carbonized Solidified Dredged Sediment

为了提高疏浚底泥强度,采用活性MgO碳化固化疏浚底泥,通过无侧限抗压强度试验,研究了疏浚底泥在活性MgO掺量、含水率、压实度、碳化时间等因素下,碳化加固疏浚底泥的强度变化。结果表明:单因素条件下,碳化加固疏浚底泥的抗压强度与MgO掺量呈正相关关系,抗压强度随含水率增加呈逐渐降低趋势;随压实度和碳化时间的增加先上升后下降。碳化效果存在最佳压实度(95%)和最佳碳化时间(2 h)。10%MgO掺量、15%含水率、95%压实度下试件碳化2 h的强度为5.65 MPa,是未碳化加固试件养护7 d强度的1.61倍。

In order to improve the strength of dredged sediment,activated MgO was used to solidify the dredged sediment.Through unconfined compressive strength test,the strength change of the dredged sediment was studied under the factors of activated MgO content,moisture content,compaction degree,carbonization time and so on.The results show that there is a positive correlation between the compressive strength of carbonized dredged sediment and MgO content under single factor condition.With the increase of water content,it gradually decreased.With the increase of compaction degree and carbonation time,it first increased and then decreased,and there was an optimal compaction degree(95%)and an optimal carbonation time(2 h).Under the condition of 10%MgO content,15%moisture content and 95%compactness,the strength of the specimens after 2 hours carbonization was 5.65 MPa,which was 1.61 times of that of the specimens without carbonization after 7 days curing.