The pore structure and hydration performance of sulphoaluminate MDF cement
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The hydration and pore structure of sulphoaluminate MDF cement were studied by X-ray diffractometer (XRD), scanning electron microscope (SEM) and mercury intrusion porosimeter (MIP) etc. The experimental results indicate that hydration products of the materials are entringites (AFt), aluminium hydroxide and CSH (I) gel etc. Due to its very low water-cement ratio, hydration function is only confined to the surfaces of cement grains, and there is a lot of sulphoaluminate cement in the hardenite which is unhydrated yet. Hydration reaction was rapidly carried under the condition of the heat-pressing. Therefore cement hydrates AFt, CSH (I) and aluminium hydroxide gel fill in pores. The expansibility of AFt makes the porosity of MDF cement lower (less than 1 percent) and the size of pore smaller (80 percent pore was less than 250Å), and enhances its strength.
Key wordsSulphoaluminate MDF cement MIP Pore structure
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- 1.W Sinclair and G W Groves. The Microstructure of High Strength Cement Pastes.Mat. Res. Symp, Proc., 1985, 42:31–37Google Scholar
- 2.Huang Congyun.The Studies of Advanced SAC-MDF Cement and Its Coupling Stabilizing Toughening Mechanism. [Doctor's academic dissertation], Wuhan: Wuhan University of Technology, 2000Google Scholar
- 3.N MCN Alford and J D Birchall. The Properties and Potential Applications of Macro-defect-free Cement.Mat. Res. Symp Proc., 1985, 42:265–275Google Scholar