摘要
通过聚二甲基硅氧烷(PDMS)赋予泡沫混凝土三维疏水功能,并引入粉煤灰、矿渣粉等辅助性胶凝材料以降低疏水泡沫混凝土的成本.结果表明:当PDMS、矿渣粉、粉煤灰掺量分别为水泥质量的1.5%、10%、35%时,泡沫混凝土的表面接触角达到132.8°,吸水率降低66.1%,28 d抗压强度达到1.38 MPa.其原因在于PDMS赋予泡沫混凝土整体疏水性;矿渣粉可提高浆体的触变性,进而提高泡沫的稳定性,改善力学性能.此外,粉煤灰及矿渣粉的引入,使得疏水泡沫混凝土的材料成本较市售泡沫混凝土降低18.2%.
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.
作者
李晶坤
罗斌
卢烁
姜东兵
LI Jingkun;LUO Bin;LU Shuo;JIANG Dongbing(The Fourth Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.,CCCC First Highway Engineering Co.,Ltd.,Tianjin 300450,China;Shandong Provincial Key Lab of Preparation and Measurement of Building Materials,University of Jinan,Jinan 250022,China)
出处
《建筑材料学报》
北大核心
2025年第5期442-448,共7页
Journal of Building Materials
基金
山东省优秀青年科学基金(ZR2023YQ041)
泰山学者计划(tsqn202306224)
济南大学优秀博士项目(XBS2431)。
关键词
泡沫混凝土
疏水化改性
聚二甲基硅氧烷
吸水率
foam concrete
hydrophobic modification
polydimethylsiloxane
water absorption
