Construction and Performance of 3D Hydrophobic Microstructure in Foam Concrete
LI Jingkun
LUO Bin
LU Shuo
JIANG Dongbing
Abstract：The three-dimensional hydrophobic function of foam concrete was realized by adding polydimethylsiloxane(PDMS),and supplementary cementitious materials such as fly ash and slag powder were introduced to reduce the cost.The results show that when the dosage of PDMS,slag powder,and fly ash in foam concrete are 1.5%,10%,and 35%respectively,the surface contact angle reaches 132.8°,the water absorption rate decreases by 66.1%and the 28 d compressive strength reaches 1.38 MPa.The reason is that PDMS forms a low surface energy film on the surface of hydration products,thus giving the foam concrete overall hydrophobicity.The slag powder can enhance the thixotropy of the slurry,thereby the stability of the foam and the mechanical properties are improved.In addition,the introduction of fly ash and slag powder reduces the material cost of hydrophobic foam concrete by 18.2%compared with that of commercial foam concrete.
Keywords：foam concretehydrophobic modificationpolydimethylsiloxanewater absorption
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 442-448 )