- 王 申，李保亮，曹瑞林，賈子健，張亞梅
2020年1期 ? No.285 ? P1-5
摘要
引用本文
摘要：制備了不同摻量的鎳鐵渣混凝土，對其抗壓強度、劈裂抗拉強度、彈性模量和干燥收縮進行了測試，并使用壓汞法對同配比凈漿的孔結構進行了表征。結果表明，鎳鐵渣混凝土的抗壓強度隨鎳鐵渣摻量的提高出現先提高后下降的現象，這與孔結構變化有顯著關系。當鎳鐵渣摻量在20%以上時，混凝土早期強度增長較為緩慢，經90 d齡期養護后基本可以彌補早期形成的強度差。鎳鐵渣的摻入降低了混凝土的劈裂抗拉強度，但混凝土的彈性模量提高。蒸汽養護可以一定程度激發鎳鐵渣的活性，但并不能彌補其取代水泥造成的強度損失。20%摻量以內的鎳鐵渣混凝土具有比純水泥混凝土較小的干燥收縮，這與鎳鐵渣摻入后混凝土孔隙率降低、彈性模量提高等相關。Abstract: Concrete with different FNS(Ferronickel slag) contents was prepared, and its compressive strength, splitting tensile strength, elastic modulus and drying shrinkage were tested. The pore structures of the pastes with the same proportions were analyzed by mercury intrusion porosimetry (MIP). The experimental results show that the compressive strength of FNS concrete increases firstly and then decreases as the FNS replacement goes higher, which has a significant correlation with the change of pore structures. When the FNS replacement is over 20%, the development of strength of FNS concretes is slower than that of plain concrete and this difference can be compensated after 90 days’ curing. Moreover, the FNS weakens the splitting tensile strength but improves the elastic modulus of concrete. The FNS can be partly activated by steam curing, but it cannot cover the loss of strength due to the decrease in cement content. FNS concrete with an FNS content less than 20% has a smaller drying shrinkage than plain concrete, which can be attributed to the lower porosity and the higher elastic modulus of concrete.
王申,李保亮,曹瑞林,等.鎳鐵渣混凝土的力學性能、干縮行為及其與漿體孔結構的關系[J].混 凝土與水泥制品,2020(1):1-5.
WANG S,LI B l,CAO R L,et al.Mechanical Properties, Drying Shrinkage and Their Relation with Pore Structure of Concrete with Ferronickel Slag[J].China Concrete and Cement Products,2020(1):1-5.
