Akademik Veri Yönetim Sistemi
13th International Biltek Congress On Current Developments in Scıence, Technology and Socıal Sciences, Paris, Fransa, 18 - 21 Aralık 2025, ss.340-348, (Tam Metin Bildiri)
Alkanolamine-based grinding aids (GAs) are widely used to improve
grinding efficiency; however, they can adversely affect the compatibility of
cementitious systems with polycarboxylate ether (PCE) superplasticizers,
particularly in terms of workability retention. This study examines the impact
of organic-acid esterification of diethanol-isopropanolamine (DEIPA) on PCE
demand and the time-dependent flow performance of cement mortars. A GA-free
cement served as the reference, while unmodified DEIPA and two esterified
products (M-DEIPA-1 and M-DEIPA-2) were incorporated during finish grinding at
two dosage levels. Mortar flow was adjusted to a target of 20 ± 2 cm to
quantify the required PCE content, and flow retention was subsequently tracked
over 60 minutes at a fixed PCE dosage. The results show that unmodified DEIPA
did not provide a meaningful reduction in PCE demand and tended to intensify
flow loss with time relative to the reference. In contrast, both modified DEIPA
products substantially decreased the PCE requirement to reach the target flow,
confirming a clear improvement in dispersion efficiency. Under constant PCE
content, all mixtures experienced a gradual reduction in flow with increasing
elapsed time; however, the modified DEIPA mixtures generally exhibited higher
retained flow than the unmodified DEIPA mixtures, with the most effective
modification route yielding the best overall performance. These findings suggest
that DEIPA esterification with organic acids is a practical approach to reduce
superplasticizer demand and partially mitigate GA-PCE incompatibility in
cementitious systems, with the magnitude of improvement dependent on the
modification chemistry and dosage.