石灰石粉-粉煤灰-矿粉多元复掺对混凝土性能的影响

摘要

研究了石灰石粉按不同比例分别取代矿粉和粉煤灰的多元复掺方式以及CTF混凝土增效剂的掺入对混凝土工作性能、强度和抗氯离子渗透性的影响。试验结果表明：在适宜掺量下，石灰石粉等量替代粉煤灰或矿粉，可以有效地改善工作性能，而随着替代量的增加，工作性能呈先增后减的趋势；石灰石粉取代粉煤灰或矿粉的量在50%之内时，对混凝土各龄期强度影响不大，但完全替代时，对混凝土的后期强度发展不利；石灰石粉替代粉煤灰或矿粉对混凝土的抗氯离子渗透性不利，电通量随替代量增加而增大；CTF混凝土增效剂的掺入可以有效地改善混凝土的和易性，提高强度以及抗氯离子渗透性。%Slag powder and fly ash were replaced with limestone powder by different quality ratios ,in this way,it discussed the influ-ence of the combined use of mineral additive and the CTF concrete synergist,on the workability,strength and the resistance to chlorine ion penetration of concrete.Results of the trial indicated that under the appropriate mix content limestone powder equally replacing fly ash or slag,can effectively improve the working performance,the workability increased firstly and then decreased as the increment of re-placement .Limestone powder replaced the amount of fly ash or slag within substitution ratio 50%,it did not much affect the strength of concrete,but completely replacing,the later strength development of concrete developed slowly.Limestone powder instead of fly ash or slag on the resistance to chloride ion permeability of concrete,electric flux increased with increasing amount of replacement.The CTF concrete synergist can effectively improve the workability,enhance the strength and the resistance to chloride ion permeability of concrete.