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Research on the Corrosion/Permeability/Frost Resistance of Concrete by Experimental and Microscopic Mechanisms Under Different Water–Binder Ratios
International Journal of Concrete Structures and Materials ( IF 3.4 ) Pub Date : 2020-02-07 , DOI: 10.1186/s40069-019-0382-8
Rongling Zhang , Peng Liu , Lina Ma , Zijiang Yang , Huisu Chen , Han Xing Zhu , Huigang Xiao , Jia Li

To study the influence of different water–binder ratios on the corrosion, permeability, and freezing properties of concrete, we produced different strengths of concrete with respective water–binder ratios of 0.32, 0.38, 0.50, and 0.66. The corrosion resistance of the concrete was studied via three corrosion methods: full immersion, half immersion, and dry and wet cycles. The impermeability and frost resistance of concrete with different water–binder ratios were tested and analyzed. The test results show that the corrosion modes in order from strong to weak were dry and wet cycles, half soaking, and full soaking. The relative dynamic elasticity modulus and freeze–thaw index were used to evaluate the frost resistance of concrete based on the analysis of three indices of frost resistance. To study the internal mechanism of corrosion of concrete with different water–binder ratios, microscopic pore structure testing of the concrete was conducted using a Micromeritics AutoPore IV 9500 Series instrument. The porosimeter studies show that the smaller the water–binder ratio, the more small pores and the denser the concrete. The smaller the water–binder ratio, the higher the strength and the better the corrosion, permeability, and frost resistance.

中文翻译:

不同水胶比下混凝土腐蚀/渗透/抗冻性的实验和微观机理研究

为了研究不同水胶比对混凝土的腐蚀、渗透和冻结性能的影响,我们生产了不同强度的混凝土,水胶比分别为 0.32、0.38、0.50 和 0.66。通过三种腐蚀方法研究混凝土的耐腐蚀性:全浸、半浸和干湿循环。测试和分析了不同水胶比混凝土的抗渗性和抗冻性。试验结果表明,腐蚀模式从强到弱依次为干湿循环、半浸、全浸。在对三个抗冻性指标进行分析的基础上,利用相对动弹性模量和冻融指数来评价混凝土的抗冻性。为了研究不同水胶比混凝土腐蚀的内部机制,使用 Micromeritics AutoPore IV 9500 系列仪器对混凝土进行了微观孔隙结构测试。孔隙度计研究表明,水与粘合剂的比例越小,混凝土的孔隙越多,混凝土的密度越大。水胶比越小,强度越高,抗腐蚀性、渗透性和抗冻性越好。
更新日期:2020-02-07
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