Hyperbranched polyesteramides (HB1 and HB2) were prepared by the bulk reaction between phthalic anhydride (PhAn) with either diisopropanolamine (DiPA) or diethanolamine (DEA), respectively. The hyperbranched polyesteramides were characterized by IR, GPC, H-1-NMR, and thermal analysis (TGA and DSC). The effects of solutions of 1, 3, and 5 wt % HB1 and HB2 on the properties of Ordinary Portland Cement (OPC) and Portland Limestone Cement (PLC) were studied. Measurements of water of consistency, setting times, bulk density, apparent porosity, and compressive strength for the cement pastes were performed. Some selected cement pastes were characterized by IR and SEM photos. The results showed that HB1 and HB2 slightly increased the compressive strength, the combined water and density while decreased the apparent porosity. IR of the formed phases showed increase in the intensities of the spectra for the cement pastes mixed with HB1 and HB2 when compared with those of the blank cement pastes. SEM images showed that the incorporation of HB1 and HB2 affected only shape or morphology and crystallinity of the formed hydrates. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 3054-3064, 2011