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采用抗水渗透试验和氯离子渗透(RCM)试验研究了普通混凝土和大掺量粉煤灰混凝土(HVFC)的渗透性能。结果表明,对于大掺量粉煤灰混凝土,采用抗氯离子渗透试验结果与抗水渗透试验结果评价混凝土渗透性存在较大差异。分析认为,抗氯离子渗透试验主要采用电方法或电化学方法间接的反映混凝土的抗渗性能,如果原材料的电阻率存在较大差异,混凝土的抗氯离子渗透性能会存在很大区别,因此,抗氯离子渗透试验结果并不能准确反映各种混凝土的渗透性差异。对于大掺量粉煤灰混凝土和强度等级≤C40的中低强混凝土,采用抗水渗透试验更能准确反映和评价混凝土的实际渗透性;对于高强或高性能混凝土,宜采用抗氯离子渗透试验评价其渗透性能。
The permeability of ordinary concrete and high volume fly ash concrete (HVFC) was studied by water penetration test and chloride ion penetration (RCM) test. The results show that for large volume fly ash concrete, there is a big difference between the experimental results of the resistance to chloride ion penetration and the results of the water penetration resistance test to evaluate the concrete permeability. Analysis shows that the chloride ion penetration test mainly uses the electrical or electrochemical methods to indirectly reflect the impermeability of the concrete. If there is a big difference in the electrical resistivity of the raw material, the chloride ion permeability of the concrete will be greatly different. Therefore, Resistance to chloride ion penetration test results do not accurately reflect the permeability of various concrete differences. For high-volume fly ash concrete and low-strength concrete with strength grade ≤C40, the water-resistant penetration test can accurately reflect and evaluate the actual permeability of concrete. For high-strength or high-performance concrete, it is appropriate to adopt the chloride ion penetration test Evaluation of its permeability.