Superplasticizer (SP) based on polycarboxylate obtained from Sika Company, El-Abor City, Egypt. Table 3 shows some of AM679 physical and chemical properties of polycarboxylate admixture.
Physical and chemical properties of polycarboxylate superplasticizer.AppearanceYellow–brown liquidSolid residue (%)Approximately 36%pH5.2–5.3Specific gravity (kg/l)Approximately 1.06%Rotational viscosity (MPa)79.30Carbon-content (C%)52.25Full-size tableTable optionsView in workspaceDownload as CSV
Mix compositions of the prepared composite cements, mass%.Mix No.OPC%NA%SP%Consistency (%)Setting times (min)Initial setFinal setM01000026.5190345M1991031.090260M2982032.380255M3964034.575245M4946036.065230MS01000120.065220MS1991122.060240MS2982122.380250MS3964122.790255MS4946123.395280Full-size tableTable optionsView in workspaceDownload as CSV
The samples subjected to thermally treated temperature were demoulded after 24 h, cured for 28 days under tap water, dried for 24 h at 105 °C, and then subjected to thermal treatment for 3 h at 250, 450, 600, 800 and 1000 °C with heating rate 5 °C/min, then cooled to room temperature in the decay series furnace atmosphere. Bulk density and compressive strength of thermally treated cement pastes were determined after immersing the pastes overnight under kerosene according to ISO-50/8, 1983.