不同粉煤灰掺量再生混凝土氯离子渗透性试验研究

Study on Chloride lon Permeability of Reclaimed Concrete with Different Dosage of Fly Ash

为探究再生混凝土氯离子渗透性能与粉煤灰掺量之间的关系,文中对不同粉煤灰掺量下再生混凝土氯离子渗透性展开试验研究。结果表明,掺入粉煤灰有利于改善再生混凝土试件抗氯离子渗透性能。掺入粉煤灰会直接影响再生混凝土6 h导电量,且6 h导电量随粉煤灰掺量增加而降低,其中,掺量较低时降速较快,掺量达到20%以上时降速放缓,推荐掺加20%粉煤灰制备再生混凝土。氯离子自然扩散试验法用于定量评定再生混凝土氯离子渗透性,其结果更加精准。

In order to explore the relationship between chloride ion permeability and fly ash content of recycled concrete,this paper carried out an experimental study on chloride ion permeability of recycled concrete under different fly ash content.The results show that the addition of fly ash is beneficial to strengthen the chloride penetration resistance of recycled concrete specimens.The addition of fly ash will directly affect the 6h conductivity of recycled concrete,and the 6h conductivity decreases with the increase of fly ash content.The decrease rate is faster when the content is low,and slows down when the content is above 20%.It is recommended to add 20%fly ash to prepare recycled concrete.The natu-ral diffusion test method of chloride ions is more accurate when it is used to quantitatively evaluate the chloride ion permeability of recycled con-crete.