Mechanical and Fatigue Properties of Lime-Fly Ash Stabilized Recycled Concrete Aggregate Mixture

Abstract

Abstract: The compaction properties of lime-fly ash stabilized recycled concrete aggregate (LFSRCA) mixture were analyzed, and the growth law of mechanical properties of the LFSRCA mixture such as unconfined compressive strength, splitting strength, flexural tensile strength, and compressive resilient modulus of resilience were studied. The fatigue life prediction method of the LFSRCA mixture was established, and the fatigue properties of the LFSRCA mixture were analyzed. The results show that with the increase of recycled concrete aggregate (RCA) content, the maximum dry density of the LFSRCA mixture decreases, and the optimum water content increases. With the increase of curing period, the mechanical properties of the LFSRCA mixture have the same growth law. The strength of the mixture increases slowly during the curing period from 0 d to 28 d, rapidly increases within 28 d to 60 d, and then the growth rate slows down within 60 d to 90 d, and finally, the strength growth tended to be flat when the curing period exceeded 90 d. The mechanical properties and fatigue life of the LFSRCA mixture decrease with the increase of RCA content. Effect of RCA content on fatigue life of the LFSRCA mixture at low stress level is higher than that at high stress level.

Key words: lime, fly ash, recycled concrete aggregate, dosage, compaction property, mechanical property, fatigue life

CLC Number:

U416.214

BIAN Wei, LI Yalong, GAO Xuekai, RONG Yapeng. Mechanical and Fatigue Properties of Lime-Fly Ash Stabilized Recycled Concrete Aggregate Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1638-1645.

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