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补偿收缩砂浆通常为预拌水泥基材料。在众多粉状组成成分中便含有膨胀剂,以死烧氧化钙(CaO)或硫铝酸钙(CSA)为代表的膨胀剂,在钢筋或粗糙混凝土基层摩擦力的限制作用下,在修补砂浆中产生压应力。由于CaO或CSA膨胀剂只有在有水的情况下才能水化,因此为保证使用效果,砂浆必须仔细养护,如不进行仔细的潮湿养护,修补工作很可能由于没有产生有效的压应力而失败,预压应力由限制膨胀产生。本工作致力于研究含CaO或CSA膨胀剂、减缩剂(SRA)砂浆在有无潮湿养护下的性能。由于有减缩剂SRA与膨胀剂的配合,即使在没有任何潮湿养护措施下,也会产生限制膨胀。但是,当CaO与减缩剂SRA复合使用时,这种效应比CSA膨胀剂更明显。
Shrinkage compensating mortar is usually pre-mixed cement-based materials. In many powder components will contain expanders, dead calcined calcium oxide (CaO) or calcium sulphoaluminate (CSA) as a representative of the expansion agent, reinforced or rough concrete base under the constraints of the friction force in the repair mortar In the resulting compressive stress. Because CaO or CSA expanders are hydrated only in the presence of water, the mortar must be carefully cured to ensure its effectiveness. If careful moist curing is not performed, repair work is likely to fail due to failure to produce effective compressive stress, Preload stress is produced by limiting expansion. This work focuses on the performance of CaO or CSA expansive and shrinkage reducing (SRA) mortars in the presence or absence of moisture. With shrinkage reducing agent SRA in combination with expanders, expansion is limited even without any wet curing. However, when CaO is used in combination with SRA, this effect is more pronounced than that of CSA.