Print Email Facebook Twitter Fresh properties of limestone-calcined clay-slag cement pastes Title Fresh properties of limestone-calcined clay-slag cement pastes Author Chen, Y. (TU Delft Materials and Environment) Zhang, Y. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Copuroglu, Oguzhan (TU Delft Materials and Environment) Date 2023 Abstract Formulation of quaternary blended system containing ordinary Portland cement or clinker, slag, limestone and calcined clay (LC2) appeared to be a viable approach to developing low-clinker cements without severely sacrificing mechanical performance at later ages. This paper investigates the effect of two material parameters, i.e., LC2-to-slag ratio and gypsum content, on fresh properties, hydration, and compressive strength of quaternary blended cement pastes (about 65 wt% of LC2 and slag in the binder). Results show that the increase in LC2 proportion decreased flowability and increased water retention capacity, yield stress, and plastic viscosity, as well as accelerated the evolution of stiffness with time (G′ growth). On the other hand, the addition of 2–4 wt% gypsum had little effect on most of the fresh properties. A new metric, the free water indicator, was proposed to describe the effect of free water content and the total specific surface area of binding materials. It correlated strongly with the growth of structural build-up metrics. Finally, adding gypsum delayed the aluminate peak and enhanced compressive strength only at 3 days, whereas increasing slag content reduced accumulated heat of hydration (7 days) but improved 28-day compressive strength. Therefore, adjusting LC2-to-slag ratio of the quaternary blended cement is a feasible way to meet requirements for fresh properties and compressive strength. Subject Limestone and calcined claySlagFresh-state behaviorsRheologyWater retentionHydrationCompressive strength To reference this document use: http://resolver.tudelft.nl/uuid:8e2f8b6e-2632-40d8-a759-c77a8077c352 DOI https://doi.org/10.1016/j.cemconcomp.2023.104962 ISSN 0958-9465 Source Cement and Concrete Composites, 138 Part of collection Institutional Repository Document type journal article Rights © 2023 Y. Chen, Y. Zhang, B. Šavija, Oguzhan Copuroglu Files PDF 1_s2.0_S0958946523000367_main.pdf 9.77 MB Close viewer /islandora/object/uuid:8e2f8b6e-2632-40d8-a759-c77a8077c352/datastream/OBJ/view