Abstract
Engineered Cementitious Composites (ECC) exhibit high ductility accompanied by multiple narrow cracking behavior under uniaxial tension. The study experimentally investigated the influence of sodium lignosulfonate and high volumes of fly ash (HVFA) on the properties of fresh and hardened ECC, with the experimental variables including the amounts of fly ash, polyvinyl alcohol (PVA) fibers, and sodium lignosulfonate. The test results were discussed extensively in terms of the initial and final setting times, compressive and tensile behavior, and drying and autogenous shrinkage. The results indicated that the initial and final setting times of ECC were increased along with the sodium lignosulfonate content of up to 1%. The drying shrinkage development was governed by the first 14 days. In addition, the major autogenous shrinkage developed for more than 28 days. The amounts of fly ash, PVA fibers, and sodium lignosulfonate considerably impacted the autogenous shrinkage. Moreover, it was found that the dosage of sodium lignosulfonate at 0.5% of the weight of Portland cement optimally reduced the shrinkage and enhanced the tensile strain capacity for ECC.
Highlights
High-performance fiber-reinforced cementitious composites (HPFRCCs) are characterized by pseudo-strain-hardening behavior accompanied by multiple narrow cracks when under uniaxial tension
Age 300 μ, about a 50% reduction compared to the case when autogenous shrinkage to around there was no NLS. shrinkage of Engineered Cementitious Composites (ECC) with different fiber contents
The inclusion of 0.5% NLS led to the least autogenous shrinkage, which could be attributed to the slowed cement hydration due to the semipermeable layer on cement grains due to the LS uptake as explained above
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. High-performance fiber-reinforced cementitious composites (HPFRCCs) are characterized by pseudo-strain-hardening behavior accompanied by multiple narrow cracks when under uniaxial tension. They have attracted the increasing attention of researchers and engineers to a wide range of innovative applications in structural engineering due to their advantageous mechanical properties and durability [1,2,3,4,5,6,7,8,9,10,11]. Zhang et al [41] showed that the replacement of Type I Portland cement with low-shrinkage cement in ECC effectively reduced the shrinkage, with the 28-day drying shrinkage strain of only 109 × 10−6 to 242 × 10−6. The results were discussed in terms of the initial and final setting times, compressive and tensile behavior, and drying and autogenous shrinkage
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