Abstract
In order to utilize industrial waste soda residue, a kind of binding material system based on soda residue-slag-cement has been developed. The microstructure and composition of hardened paste of the binding material system after curing for 28 days was analyzed by means of scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetric-differential scanning calorimetry (DSC-TG). The main hydration products of binding material system after curing for 28 days were C-S-H gel and 3CaO·Al2O3·CaCl2·10H2O crystal (Friedel’s salt) with a needle bar and irregular shape. The Ca/Si ratio of C-S-H gel in hydration products varied from 0.7 to 1.4, the ratio of n(Cx-S-Hy)/n(3CaO·Al2O3·CaCl2·10H2O) varied in the range of 1.8~6.4. The C-S-H gel and Friedel’s salt constituted the main strength source of the whole soda residue-slag-cement binding material system.
Highlights
The rapid development of industry has driven the world economy
The results showed that the compressive strengths of the geopolymer cements can achieve 60 MPa, which is comparable to hardened Portland cements and adequate for construction purposes
It was found that when soda residue, fly ash, steel slag, and stone powder were prepared according to the mass ratio of 4:3:2:1, the compressive strength of baking-free brick curing for 7 days was 14.0 MPa and was 20.6 MPa curing for 28 days
Summary
The rapid development of industry has driven the world economy. the resulting industrial waste occupied the land and polluted the soil, water and air, which caused pollution to the global environment (Chen, 2018). The research showed that the compressive strength of the alkaliactivated fly ash-based samples incorporating about 20% soda residue curing for 60 and 180 days was 13.5 and 18.0 MPa, the geopolymers had low shrinkage and good thermal stability. It was found that when soda residue, fly ash, steel slag, and stone powder were prepared according to the mass ratio of 4:3:2:1, the compressive strength of baking-free brick curing for 7 days was 14.0 MPa and was 20.6 MPa curing for 28 days. The cement used in the soda residue-slagcement binding material system was Portland cement (P.II 42.5), cement used in preparing cement mortar specimen for strength comparison was ordinary Portland cement (P.O 42.5R) Both slag and cement came from Qinhuangdao municipal construction group co., LTD in Hebei. Each group was molded into six mortar specimens, which were taken for average calculation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
