Title:
Effects of Different SCM on ASR of Seawater Sea-Sand Cement-Based Materials (Prepublished)
Author(s):
Dehui Wang, Qingnan Gong, Rong Chen, Ming Wang, Ran Chen, Lincheng Weng, and Qingtian Zhang
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
alkali-silica reaction (ASR); ASR product; expansion rate; seawater sea-sand cement-based materials (SWSSCM); supplementary cementitious materials (SCMs)
DOI:
10.14359/51750611
Date:
3/25/2026
Abstract:
The alkali-silica reaction (ASR) of seawater sea-sand cement-based materials (SWSSCM) applied in marine engineering cannot be underestimated since seawater and sea-sand have high content of alkali ions. To reduce the ASR of SWSSCM, this paper compares the inhibition effect of three kinds of supplementary cementitious materials (SCMs) on it. The results show that the expansion rate of SWSSCM without SCMs is up to 0.212% at 14 days, which shows a high ASR risk of SWSSCM. The incorporation of SCMs can efficiently reduce the ASR risk of SWSSCM. Compared with that of SWSSCM without SCMs, the expansion rate of SWSSCM with 50% metakaolin, fly ash and slag at 28 days can be reduced by 94.8%, 90.7% and 80.6% respectively; the content of crystalline ASR product Na-shlykovite (NaCaSi4O8(OH)3·2.3H2O) is decreased by 81.4%, 69.2% and 47.9%, respectively; and the content of less harmful pores is increased by 76.8%, 48.1% and 36.9%, respectively. The inhibition effects of metakaolin and fly ash on ASR are better than that of slag, and the suggested optimal contents of metakaolin, fly ash, and slag to replace cement are 10%~20%, 20%~30%, and 30%~40%, respectively. Moreover, the physical and chemical inhibition effects of SCMs on the ASR of SWSSCM are clarified, which provides the basis for the durability design of SWSSCM in the marine environment.