Grinding kinetics of waste glass powder and its composite effect as pozzolanic admixture in cement concrete. (10th April 2020)

• Record Type: Journal Article
• Authors: Chen, Zhiyong; Wang, Yinlong; Liao, Sen; Huang, Yingheng
• Is Part Of: Construction & building materials. Volume 239(2020)
• Publication Date: 2020-04-10
• Subjects: Waste glass -- Size distribution -- Grinding dynamics -- Mortar -- Activity index -- Composite effect; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117876
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstracts: Highlights: Grinding kinetics of WGP was studied. Mechanical grinding can effectively excite the activity of WGPs. Composite effect of WGPs in pozzolanic admixture of cement concrete was investigated. The optimal addition of WGPs and silica fume replacing cement are 27 and 3%. Abstract: In this work, the kinetics functions and characteristics of the grinding as well as the particle size distribution (PSD) with population balance are obtained by fitting and analyzing the size distribution curves of waste glass powder (WGPs) ground for different time. The influences of activation condition and percent addition on the pozzolanic activity of WGPs in mortar bars are also investigated. The test results indicate that the grinding time required for WGPs is correspondent to Rosin–Rammler–Benne (RRB) distribution model. The results of Blaine finness show that both the equivalent particle size and specific surface area (SSA) of glass powder show a good linear relation to logarithm or double logarithm of grinding time. The first-order exponential decay relationship between the size fraction yield of WGPs and the grinding time under lab conditions is confirmed. Activity indexes of WGPs at 7, 28, 56 and 90 days increase with prolonging mechanical activating time within the range of this experiment, which indicate that mechanical grinding can effectively excite the activity of WGPs. The flowability is the best when the grinding time reaches 45 min, and the median particle size is about 10 μm. The experimental results indicate that mechanical grinding can effectively excite the activity of WGPs. The composite effect of WGPs and silica fume (SF) instead of partial cement in mortar bars shows the complementary effect in strength. Furthermore, the study concludes that when considering factors such as cost, workability, durability, etc., the optimal percent addition of WGPs and SF replacing cement are 27% and 3% in mass, respectively.