低碳型耐酸混凝土的试验研究

Experimental Study on Low Carbon Acid Resistant Concrete

随着碳达峰、碳中和目标行动方案的细化和进一步实施,低碳已经成为我国未来各行各业的发展方向。研究用工业固体废弃物中的矿粉和粉煤灰来大量取代水泥,利用质量分数为5%的稀硫酸溶液来模拟酸性腐蚀环境,以期研发出具有耐酸性能的低碳混凝土。结果表明:大量掺入矿粉和粉煤灰的混凝土的早期强度虽然不高,但长期强度发展较好;大量掺入粉煤灰和超细矿粉可以使混凝土内部变得更加致密,抑制硫酸的侵入与化学反应,有利于控制混凝土因硫酸侵蚀而发生的质量变化,也可以有效减小硫酸中性化深度。

With the refinement and further implementation of the action plan of carbon peak and carbon neutralization goals,low carbon has become the development direction of all walks of life in China in the future.This study used mineral powder and fly ash from industrial solid waste to replace cement in large quantities.And then,applying a dilute sulphuric acid solution of 5%mass fraction to simulate an acidic corrosive environment,in order to develop low carbon concrete with acid resistance.The results showed that the early strength of concrete mixed with mineral powder and fly ash is not high,while the long-term strength is better;A large amount of fly ash and ultra-fine mineral powder can make the concrete more dense inside,the inhibition of sulfuric acid invasion and chemical reaction is beneficial to control the quality change of concrete caused by sulfuric acid erosion,and also can effectively reduce the neutralization depth of sulfuric acid.