-3℃养护对混凝土抗压强度及孔结构的影响

Discussion of -3℃ Cure Temperature on Concrete Compressive Strength and Its Pore Structure

为了研究不同水灰比下混凝土的孔结构与强度之间的关系,测试了-3℃养护及标准养护条件下不同水灰比时混凝土孔结构的分布规律及强度变化规律。结果表明,在2种养护方式下,随着水灰比的增大,混凝土的气泡间距系数、气泡平均孔径、硬化后混凝土的孔隙率均逐渐增大,气泡的比表面积逐渐减小;在相同水灰比标准养护条件下混凝土的气泡间距系数、气泡平均孔径、硬化后混凝土的孔隙率及气泡比表面积均小于-3℃养护条件下;抗压强度随着水灰比的增大而逐渐减小。

In this paper,the influence of water-cement ratio on the relationship between concrete pore structure and strength was studied.Two different cure environments were compared：at-3℃ and standard curing.The results indicate that bubble hole spacing coefficient of concrete,concrete bubble average pore diameter and porosity of the concrete increase as the water-cement ratio goes up,but the bubble surface area decreases in these two cases.By comparison,the values of the four parameters mentioned above are less in the case of standard curing given the same water-cement ratio.As the water-cement ratio increases,concrete compressive strength decreases gradually.