Cemented paste backfill (CPB) has become a significant structural material in most mines across the world. In this study, the effects of chemical rheological additives including viscosity modifying agent (i.e., polyacrylamide) and polycarboxylate superplasticizer (PCE) on fresh and hardened properties of CPB with different water-to-solid (W/S) ratios and water-to-cement (W/C) ratios were investigated. The microstructure of CPB specimens was also characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and backscattered electron image (SEM-BSE). The obtained results indicate that PAM (polyacrylamide) dosage and W/S are the most significant parameters influencing the workability of fresh CPB mixtures. For the hardened CPB specimens, the decreasing W/S ratio leads to higher flexural and compressive strength values and lower dry shrinkage strains. The interfacial transition zone (ITZ) between the cement matrix and the tailings sand was also observed to be narrower, with fewer micro cracks and capillary pores. Meanwhile, the existence of PAM decreased the number of hydration products and retarded the hydration reaction. Overall, the CPBs with high W/C ratios (i.e., 1.0 and 1.2), low W/S ratios (i.e., 0.3), and moderate amounts of rheological additives (i.e., 0.05% PAM and 1.0% PCE) have excellent fresh and hardened properties. The findings of this study contribute to better optimization of CPB mixtures in backfill construction, bringing benefits of low costs and low environmental impacts.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9101245 | PMC |
| http://dx.doi.org/10.3390/ma15093006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Dynamic reactive synthesis of bio-based compatibilizer via diepoxide monomers grafting polylactic acid and reactive compatibilization of incompatible polylactic acid/bamboo powder composites.
Int J Biol Macromol
March 2025
School of Chemistry and Chemical Engineering Hainan University, Haikou 570228, Hainan Province, China; Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang Province, China. Electronic address:
The synthesis of monomers with two epoxy structures (EIA) was successfully achieved by adopting holo-biobased feedstocks and in situ solvolysis reaction. The molecular structure of EIA was subjected to characterization through the use of infrared spectroscopy (IR), mass spectrometry (MS), and nuclear magnetic resonance hydrogen spectroscopy (H NMR). The EIA was employed as the epoxy monomers for the synthesis of the grafted compatibilizer, resulting in the successful preparation of a fully bio-based and high epoxy value grafted compatibilizer (PLA-g-EIA (PLE)).
View Article and Find Full Text PDF3D-printed gelatin/dialdehyde starch hydrogels for hydrocortisone topical administration and in vivo treatment of atopic dermatitis.
Colloids Surf B Biointerfaces
March 2025
Laboratório de Tecnologia e Desenvolvimento de Compósitos e Materiais Poliméricos (LaCoPol), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão s/n, Pelotas, RS 96010-900, Brazil. Electronic address:
Atopic dermatitis (AD) is a chronic disorder affecting millions worldwide. Recent advancements suggest that combining therapies can significantly improve AD treatment outcomes and mitigate the challenges of long-term drug use, particularly with corticosteroids. In this study, we developed a 3D-printed hydrogel composed of gelatin (Gel) and dialdehyde starch (DAS), capable of encapsulating and delivering hydrocortisone (HC).
View Article and Find Full Text PDFEffect of pectic polysaccharides from fresh passion fruit (Passiflora edulis f. flavicarpa L.) peel on physicochemical, texture and sensory properties of low-fat yoghurt.
Food Chem
March 2025
Dongguan Key Laboratory of Typical Food Precision Design, China National Light Industry Key Laboratory of Healthy Food Development and Nutrition Regulation, School of Life and Health Technology, Dongguan University of Technology, Dongguan 523808, China. Electronic address:
This study explored the effects of pectic polysaccharide (PFP-T) obtained from passion fruit peel by three-phase partitioning on physicochemical, textural and sensory properties of low-fat yoghurt, compared with citrus pectin (CP). The results indicate that addition of PFP-T and CP both improved the fermentation rate, water holding capacity, texture, and rheological properties of low-fat yoghurt. Especially, 0.
View Article and Find Full Text PDFRheological properties of highly stable foams co-stabilized by nanoparticles and xanthan gum or guar gum.
Int J Biol Macromol
March 2025
College of Safety Science and Engineering, Xi'an University of Science and Technology, 710054, China.
Highly stable foams co-stabilized by nanoparticles (NPs) and biopolymer have good foaming ability and foam stability, which ensures the reliability and efficiency of the foam during the fire extinguishing process. It is worth noting that the addition of NPs and biopolymers significantly affects the flow characteristics of the foam in the pipeline and its structural stability, which play a key role in the fire extinguishing process. Therefore, it is very important to understand the effect of the addition of different types of biopolymers on the rheological properties of nano-stabilized foams.
View Article and Find Full Text PDFEffect of a polymeric compound layer on jetting dynamics produced by bursting bubbles.
RSC Adv
March 2025
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA
Jetting dynamics from bursting bubbles play a key role in mediating mass and momentum transport across the air-liquid interface, and have attracted widespread interest from researchers across disciplines. In marine environments, this phenomenon has drawn considerable attention due to its role in releasing biochemical contaminants, such as extracellular polymeric substances, into the atmosphere through aerosol production. These biocontaminants often exhibit non-Newtonian characteristics, yet the physics of bubble bursting with a rheologically complex layer at the bubble-liquid interface remains largely unexplored.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!