摘要
为充分发挥混凝土骨料的骨架作用,本研究通过试验探究了骨料种类及级配对混凝土力学性能的影响,对比了常规试验方法和Fuller密级配理论所成型混凝土的性能差异,分析了不同试验条件下混凝土力学性能的变化规律。结果表明:密级配混凝土更能充分发挥骨料的骨架作用,其结构更加密实。在引气和不引气条件下,密级配混凝土的60 d抗压强度分别为常态混凝土的1.04倍和1.08倍;掺加引气剂会导致混凝土强度有所降低。卵石骨料配制的混凝土的抗压强度随着龄期的增长而增加,而其轴心抗压强度则随着龄期的增长呈先增大后减小的趋势;二级配碎石配制的密级配混凝土的强度与常态混凝土接近。混凝土的微应变随着时间的发展呈先快速增长、后缓慢增长、最终趋于相对稳定的趋势,其中,卵石骨料密级配混凝土的微应变整体低于常态混凝土,碎石骨料常态混凝土具有相对更小的微应变;加入0.06%引气剂后,混凝土的微应变有所增大。
To fully utilize the skeleton effect of concrete aggregates,this study investigates the inf luence of aggregate type and gradation on the mechanical properties of concrete through experimentation.A comparison is made between the performance of concrete formed using conventional testing methods and that based on the Fuller dense-gradation theory,analyzing the variation patterns of concrete's mechanical properties under different testing conditions.The results indicate that densely-graded concrete can more effectively utilize the skeleton effect of aggregates,resulting in a more compact structure.Under airentrained and non-air-entrained conditions,the 60 days compressive strength of densely-graded concrete is 1.04 times and 1.08 times that of conventional concrete,respectively.The addition of an air-entraining agent leads to a reduction in concrete strength.The compressive strength of concrete prepared with pebble aggregates increases with curing age,while its axial compressive strength initially increases and then decreases with curing age.The strength of densely-graded concrete prepared with two-graded crushed stone is close to that of conventional concrete.The micro-strain of concrete exhibits a trend of initially rapid growth,followed by slower growth,and eventually stabilizes relatively over time.Specifically,the micro-strain of densely-graded concrete with pebble aggregates is generally lower than that of conventional concrete,while conventional concrete with crushed stone aggregates exhibits relatively smaller micro-strain.After adding 0.06%air-entraining agent,the micro-strain of concrete increases.
出处
《混凝土世界》
2026年第2期57-62,共6页
China Concrete
基金
中央引导地方科技发展专项资金项目(ZYYD2023B04)
自治区公益性科研院所基本科研业务经费资助项目(KY2024081)。
