Abstract
This paper was designed to reveal the hydration products and to characterize the interfacial transition zone (ITZ) in the lightweight aggregate concrete (LWAC) after long-term serving. The results show that the compressive strength and freeze and thaw resistance is evidently dampened. Only a few C2S circling with ferrite remain unhydrated and monosulfate (AFm) tends to form loose structure to generate small pores where microcracks initiate after loading. Ettringite (AFt), calcium silicate hydrate (C-S-H), and portlandite (CH) precipitate in the inlaid zone (IZ) of LWA. The microcracks initiate from the ITZ of sand, connect with the cracks induced by pores and insert into the inner part of LWA through IZ, whereas the cracks in the LWA without IZ bypass the LWA through ITZ. The major issue for improving performance of LWAC is to modify the surface of LWA to avoid formation of porous ITZ and to improve the structure and property of IZ.
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