Abstract
Layered Double Hydroxide (LDH) Is Reported To Improve The Durability Of Concretes, Primarily Due To Its Ability To Exchange Anionic Species, Including Chloride, Which Is Implicated In Corrosion-Driven Durability Issues. However, There Is No Comprehensive Study Investigating The Effect Of LDH On The Properties Of Different Cement Systems At Both Early And Mature Ages. In This Study, The Early Age And Mature Age Properties Of Portland Cement (OPC) And Calcium Sulfoaluminate (CSA) Cement Pastes Seeded With Submicron-Sized Calcium Aluminum-NO3 LDH (CaAl-NO3 LDH) Were Investigated. The Effects Of The 1–5%mass Dosage Of LDH On The Hydration Of Both Cement Systems Were Characterized By Rheology, Isothermal Calorimetry, Porosimetry, Compressive Strength Tests, Thermogravimetric Analysis, And X-Ray Diffraction. Time-Dependent Rheology Results Indicate That CaAl-NO3 LDH Seeding Enhanced The Buildability Of Cement Pastes, As Evidenced By Increased Plasticity Loss, Hardening, And Yield Stress. While LDH Seeding Accelerated Hydration Kinetics For Both CSA And OPC Pastes, Interestingly, The OPC Exhibited Reduced Heat Release, Suggesting Potential Applications Of LDH As Heat Sink In Various Areas, Including Building In Hot Climates, Reducing Heat And Crack-Propensity In Mass Concrete Placements, And 3D-Printed OPC-Based Concretes. Although LDH Slightly Decreased Compressive Strengths At Both 1d And 28d, Its Primary Role Was To Expedite The Hydration Process Without Enhancing The Microstructure Or Strength Of The Final Product.
Recommended Citation
S. K. Mondal and M. U. Okoronkwo, "Seeding Effects Of Submicron CaAl-NO3 LDH Particles On The Hydration And Properties Of Portland Cement And Sulfoaluminate Cement Pastes," Construction and Building Materials, vol. 423, article no. 135870, Elsevier, Apr 2024.
The definitive version is available at https://doi.org/10.1016/j.conbuildmat.2024.135870
Department(s)
Chemical and Biochemical Engineering
Keywords and Phrases
AFm phase; Calcium sulfoaluminate cement; Chemical admixtures; Layered double hydroxide; Portland cement; Rheology
International Standard Serial Number (ISSN)
0950-0618
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
12 Apr 2024
Comments
National Science Foundation, Grant 1932690