Pore Structure Development of Evaporation Zone of Partially Immersed Calcium Sulphoaluminate Cement Concrete
LIU Zanqun1,*, ZHOU Yunchan1, HU Wenlong2, PENG Jiawei1
1 School of Civil Engineering, Central South University, Changsha 410075, China 2 Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430000, China
Abstract: The hydration of calcium sulphoaluminate (CSA) cement needs a large amount of water and hydrates quickly. A large amount of unhydrated cement will be left, and ettringite will be further formed in the harden concrete, influencing the development of pore structure and mechanical properties of concrete. In this paper, the field conditions of half-immersed concrete were simulated by half immersion method. The pore structures of evaporation zone of CSA cement concretes with the water-cement ratio of 0.35, 0.45 and 0.55 were studied after half-immersion for 35 d, 70 d and 130 d by means of nuclear magnetic resonance (NMR) and scanning electron microscope (BSE mode). The test results showed that the porosities of concretes with the water-cement ratio of 0.35 and 0.45 increased, then decreased, and increased again; the porosity of concrete with the water-cement ratio of 0.55 declined, and then increased. The test results supported that the pore structure development of CSA cement concrete was controlled by the combined effects of crystallization expansion and pore refinement due to the ettringite formation after hardening.
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2023, Vol. 37 
