Durability Study of Hydrophobically Modified Foamed Concrete Under Dry-Wet Cycles
TIAN Zhenhai1,2, LUO Bin1,2, LI Mingming1,2, YANG Longlong1,2, SU Yanli3, JIANG Dongbing3,*, ZHAO Piqi3
1 CCCC First Harbor Engineering Co., Ltd., Tianjin 300450, China 2 CCCC First Harbor Engineering Co., Ltd., Branch Fourth, Nanchang 330000, China 3 Shandong Provincial Key Laboratory of Green and Intelligent Building Materials, University of Jinan, Jinan 250022, China
Abstract: To extend the service life of foamed concrete under dry-wet cycle conditions, a bulk hydrophobic modification of foamed concrete was prepared by incorporating modified polydimethylsiloxane (mPDMS). The effects of mPDMS dosages (0.8%, 1.6%, 2.4%) on the contact angle, water absorption rate of foamed concrete, as well as its mass, strength, and acoustic parameters under dry-wet cycles were systematically investigated. Moreover, combined with scanning electron microscopy (SEM), capillary pressure, and drying shrinkage tests, the mechanism by which mPDMS inhibits the structural deterioration of foamed concrete was revealed. The experimental results presented that mPDMS conferred bulk hydrophobicity to foamed concrete, raising the contact angle to 106° and lowering the maximum water absorption rate to 39.7%. After 45 dry-wet cycles, the strength loss rate and the mass loss rate of foamed concrete containing 2.4% mPDMS are 71.4% and 38.3% lower than those of the control sample, respectively. In contrast, the foamed concrete without hydrophobic modification exhibits obvious cracking. These findings demonstrate that the incorporation of mPDMS can significantly improve the dry-wet cycle resistance of foamed concrete, owing to the low surface energy hydrophobic layer formed in the capillary pores of interstitial region and foam wall mitigated the development of microcracks.
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2026, Vol. 40 
