Employing of some hyperbranched polyesteramides as new polymeric admixtures for cement

Abstract

Hyperbranched polyesteramides (HBPA 1 and HBPA 2 ) were synthesized by the bulk polycondensation of maleic anhydride (MA n ) as an A 2 monomer with both of diisopropanolamine (DIPA) and diethanolamine (DEA), respectively, as B 0 B 2 monomer. The prepared polymers were analyzed with IR, GPC, 1 H NMR, TGA, and DSC. The hyperbranched polyesteramides were applied as polymeric admixtures in two different types of cement, namely ordinary Portland cement (OPC) and Portland limestone cement (PLC). Several parameters were studied to evaluate the action of HBPA 1 and HBPA 2 polymers as cement admixtures. Adding HBPA 1 and HBPA 2 decreased the water of consistency and increased the compressive strength with no effect on the chemical composition of the cement phases. The combined water content and bulk density displayed the same trend as compressive strength. The IR spectra of the formed phases for the mixed cement pastes with HBPA 1 and HBPA 2 illustrated increased intensities of the absorption bands than those of the pristine cement pastes. The SEM photos showed that the incorporation of HBPA 1 and HBPA 2 in cement phases affected the morphology and microstructure of the formed hydrates.

Modification of cement with succinic anhydride‐based hyperbranched polyesteramide

“…The prepared polymers and the formed polymer/cement pastes were characterized by using different techniques such as Infrared spectra (IR), Gel permeation chromatography (GPC), Nuclear magnetic resonance ( 1 HNMR), and scanning electron microscopy (SEM) 6, 7. The standard water of consistency as well as the setting times (initial and final) of the cement pastes were directly determined by Vicat apparatus 12, 13.…”

“…The standard water of consistency as well as the setting times (initial and final) of the cement pastes were directly determined by Vicat apparatus 12, 13. Bulk density (BD) and apparent porosity (A.P) of the hardened cement pastes were calculated from equations 1 and 2, respectively:14, 6, 7 …”

“…Compressive strength of the hardened cement pastes was measured by using a hydraulic testing machine LPM 600 M1 SEIDNER (Germany) having a full capacity of 600 KN 15, 6, 7…”

“…HYP 1 and HYP 2 were prepared as previously described in the literature,15, 16 and as mentioned in our publications,6, 7 as in the following: A mixture of (DiPA or DEA) and ScAn with a molar ratio for (DiPA or DEA)/ ScAn of 1.15/1 was introduced into three‐necked flask placed into thermostated oil bath and equipped with a mechanical stirrer and a vacuum pump. The reaction mixture was gradually heated to 170°C, with continuous stirring.…”

“…The two hyperbranched polyesteramides, HYP 1 and HYP 2 were added to OPC and PLC by dissolving them in the mixing water with the dosages of 0, 1, 3, and 5 wt % and the cement pastes were processed as published in our previous communications 6, 7…”