A novel integration strategy for the foaming and hydrophobization of geopolymer foams

Dong，Chunling1; Shao，Ningning2; Yan，Feng1; Ji，Ru3; Wei，Xuankun1; Zhang，Zuotai1

2022-10-01

10.1016/j.cemconres.2022.106919

CEMENT AND CONCRETE RESEARCH   Impact Factor & Quartile

0008-8846

Traditionally, hydrophobic geopolymer foams (GPFs) are prepared in two steps: GPFs hardening and hydrophobic treatment. Here, we reported a novel two-in-one strategy for the simultaneous foaming and hydrophobization of GPFs by using polymethylhydrosiloxane (PMHS) as the key double-functional agent and calcium stearate (CS) as the foam stabilizer. With the combined effect of PMHS and CS, the pore size could be controlled in the range of 0.27–6.82 mm and bulk density in 200–700 kg/m, which further influenced the compressive strength and thermal conductivity. The as-prepared GPFs showed superhydrophobic properties, with contact angles as high as 170°. Theoretically, alkylated nano‑silicon fibers grew on the GPFs surface, which acted as a hydrophobic cover and increase the surface roughness, both contributing to the superhydrophobic. Overall, our work presents a novel two-in-one strategy for the preparation of superhydrophobic GPFs, which would be of great significance to the application of GPFs.

Fly ash Foam control Geopolymer foams Hydrophobization Polymethylhydrosiloxane

EI

English

First

National Key Research and Development Program of China[2018YFC1902904];Basic and Applied Basic Research Foundation of Guangdong Province[2020A1515110878];Basic and Applied Basic Research Foundation of Guangdong Province[2021A1515010148];National Natural Science Foundation of China[22008104];National Natural Science Foundation of China[52008265];Shenzhen Peacock Plan[KQTD20160226195840229];

20223212552177

Compressive strength ; Fly ash ; Hydrophobicity ; Inorganic polymers ; Pore size ; Surface roughness

Masonry Materials:414 ; Inorganic Polymers:815.1.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85135504009

Scopus

1.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Southern University of Science and Technology,Shenzhen,518055,China
2.Institute of Technology for Marine Civil Engineering,Shenzhen Institute of Information Technology,Shenzhen,2188 Longxiang Avenue,518055,China
3.School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing,100083,China

Dong，Chunling,Shao，Ningning,Yan，Feng,et al. A novel integration strategy for the foaming and hydrophobization of geopolymer foams[J]. CEMENT AND CONCRETE RESEARCH,2022,160.

Dong，Chunling,Shao，Ningning,Yan，Feng,Ji，Ru,Wei，Xuankun,&Zhang，Zuotai.(2022).A novel integration strategy for the foaming and hydrophobization of geopolymer foams.CEMENT AND CONCRETE RESEARCH,160.

Dong，Chunling,et al."A novel integration strategy for the foaming and hydrophobization of geopolymer foams".CEMENT AND CONCRETE RESEARCH 160(2022).