Influence of Lightly Burned MgO on the Mechanical Properties and Anticarbonization of Cement-Based Materials

Lin Wang, Li Chao, Shu Chunxue, H. Yong, Jianmin Wang, Hui Wang
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引用次数: 3

Abstract

This study aims to study the influence of a lightly burned magnesium oxide (LBMO) expansion agent on the rheological properties (the slump flow, plastic viscosity and variation of shear stress) of cement-based materials. Four different mass contents (i.e., 0%, 3%, 6% and 9%) of LBMO were selected. The following compressive strength and expansion value of the corresponding cement concrete were tested. Cement concrete with two strength grades of 30 MPa and 50 MPa (C30 and C50) was selected. Results indicated that the addition of LBMO can effectively decrease the fluidity and increase the plastic viscosity of fresh cement paste. An optimum dosage (3%) of LBMO is the most advantageous to the compressive strength of cement concrete. The addition of LBMO can increase the expansion rate of cement concrete, thus preventing inside cracks. Moreover, the incorporation of LBMO led to a reduction in the fluidity of the cement paste and an increase in plastic viscosity. The addition of LBMO can increase the expansion rate of cement concrete, thus preventing inside cracks. It can be found that little difference exists in the compressive strength and the expansion rate of cement concrete with strength grades of 30 MPa and 50 MPa. Finally, the increased dosage of LBMO, curing age and compressive strength led to improving the carbonization resistance of cement concrete.
轻烧MgO对水泥基材料力学性能和抗碳化性能的影响
本研究旨在研究轻烧氧化镁(LBMO)膨胀剂对水泥基材料流变性能(坍落度流动、塑性粘度和剪切应力变化)的影响。选择4种不同质量含量(0%、3%、6%、9%)的LBMO。测试了相应水泥混凝土的抗压强度和膨胀值。选用30mpa和50mpa两个强度等级(C30和C50)的水泥混凝土。结果表明,掺加LBMO可有效降低鲜水泥浆体的流动性,提高其塑性粘度。LBMO的最佳掺量(3%)对水泥混凝土的抗压强度最有利。LBMO的加入可以提高水泥混凝土的膨胀率,从而防止内部裂缝。此外,LBMO的掺入导致水泥浆体流动性降低,塑性粘度增加。LBMO的加入可以提高水泥混凝土的膨胀率,从而防止内部裂缝。可以发现,强度等级为30 MPa和50 MPa的水泥混凝土的抗压强度和膨胀率差异不大。LBMO掺量的增加、养护龄期的增加和抗压强度的增加均能提高水泥混凝土的抗碳化性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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