摘要
在水工大体积普通硅酸盐水泥(OPC)混凝土中使用氧化镁(MgO)复合钢纤维是一种极具潜力的新技术,但是不适用于沿海或海洋工况,而铁铝酸盐水泥(FAC)由于其低碳、耐腐蚀性好则更为适用,但尚不清楚氯盐侵蚀是否会影响MgO和纤维的协同,从而对混凝土力学性能产生不利影响。因此,设计了MgO和聚丙烯纤维(PPF)的16种配比,标准养护28天后分别放入纯水和盐水中进行浸泡,研究氯盐侵蚀条件下含MgO和PPF的FAC混凝土的抗压强度及劈裂抗拉强度变化规律。结果表明:短时间氯盐侵蚀未降低FAC与OPC混凝土强度,反而使其提升,且不影响MgO与PPF协同作用;长期来看,FAC因低渗透性更具优势,OPC则易受侵蚀导致性能下降。
The use of magnesium oxide(MgO)composite steel fiber in hydraulic mass ordinary portland cement(OPC)con⁃crete is a promising new technology,but it is not suitable for coastal or marine conditions.Ferroaluminate cement(FAC)is more suitable because of its low carbon and good corrosion resistance.However,it is not clear whether chlorine salt erosion will affect the synergy between MgO and fiber,thus adversely affecting the mechanical properties of concrete.Therefore,16 kinds of ratios of MgO and polypropylene fiber(PPF)were designed.After 28 d of standard curing,they were i mmersed in pure water and salt water respectively.The compressive strength and splitting tensile strength of FAC concrete containing MgO and PPF under chloride corrosion conditions were studied.The results indicate that short-term chloride exposure does not reduce the strength of FAC and OPC concrete,but rather enhances it,without affecting the synergistic effect between MgO and PPF.In the long term,FAC has an advantage due to its low permeability,while OPC is prone to erosion,leading to a decline in performance.
作者
刘雷
陆海
沈晓狄
陈泽源
杨帮游
张兵兵
Liu Lei;Lu Hai;Shen Xiaodi;Chen Zeyuan;Yang Bangyou;Zhang Bingbing(Power China Huadong Engineering Corporation,Hangzhou 311100,China;School of Engineering,Hangzhou City Uni-versity,Hangzhou 310015,China)
出处
《水泥工程》
2025年第5期39-41,46,共4页
Cement Engineering
关键词
聚丙烯纤维
氧化镁
铁铝酸盐水泥
力学性能
氯盐侵蚀
polypropylene fiber
magnesium oxide
ferroaluminate cement
mechanical properties
chlorine salt erosion
