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Microstructure development and autogenous shrinkage of mortars with C-S-H seeding and internal curing
Abstract The impact of a hardening accelerator based on C-S-H seeding on the microstructure development and the autogenous shrinkage of low water-to-cement ratio (w/c) mortars is studied. C-S-H seeding leads to a significant refinement of the pore structure at early stages of hydration. In the w/c 0.35 mortar with C-S-H seeding, higher mechanical properties are measured up to 1 d; later the effect of seeding becomes insignificant. On the other hand, in the w/c 0.30 mortar the mechanical properties at later ages were reduced with C-S-H seeding. At the same time, the faster refinement of porosity due to seeding at very early ages leads to faster self-desiccation in all mortars. Consequently, lower RH is reached, which is accompanied by higher autogenous shrinkage of the mortars with C-S-H seeding. As a countermeasure, superabsorbent polymers (SAP) were employed as internal curing agents to reduce self-desiccation and autogenous shrinkage in mortars with seeding agents.
Microstructure development and autogenous shrinkage of mortars with C-S-H seeding and internal curing
Abstract The impact of a hardening accelerator based on C-S-H seeding on the microstructure development and the autogenous shrinkage of low water-to-cement ratio (w/c) mortars is studied. C-S-H seeding leads to a significant refinement of the pore structure at early stages of hydration. In the w/c 0.35 mortar with C-S-H seeding, higher mechanical properties are measured up to 1 d; later the effect of seeding becomes insignificant. On the other hand, in the w/c 0.30 mortar the mechanical properties at later ages were reduced with C-S-H seeding. At the same time, the faster refinement of porosity due to seeding at very early ages leads to faster self-desiccation in all mortars. Consequently, lower RH is reached, which is accompanied by higher autogenous shrinkage of the mortars with C-S-H seeding. As a countermeasure, superabsorbent polymers (SAP) were employed as internal curing agents to reduce self-desiccation and autogenous shrinkage in mortars with seeding agents.
Microstructure development and autogenous shrinkage of mortars with C-S-H seeding and internal curing
Wyrzykowski, Mateusz (author) / Assmann, Alexander (author) / Hesse, Christoph (author) / Lura, Pietro (author)
2019-12-24
Article (Journal)
Electronic Resource
English
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