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Nowadays, self-healing properties of concrete are emphasized in addition to the mechanical properties and durability, especially in the design of concrete for major project in harsh environment. Therein, aiming to improve intrinsic self-healing ability, aggregates gradation (AG) and sand ratio (SR) were adjusted, and the maximum aggregate size (Dmax) was optimized. The results showed that proper aggregate gradation and sand ratio not only contributed to high compressive strength, but also to enhance intrinsic self-healing ability. Especially for the concrete with small Dmax and the SR of 37%, the self-healing ability was improved according to the ultrasonic waveform results. Furthermore, the cracks of specimens with SR of 33% could be healed completely on the basis of the ultrasonic pulse velocity (UPV) and the measurement of crack’s closure. Better self-healing ability of concrete could be obtained by adjusting Dmax and SR properly. Thus, intrinsic self-healing ability should be taken as an index in the design and preparation of concrete. |
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