Ⅱ级灰对配制大掺量粉煤灰混凝土的性能影响

THE EFFECT OF THE Ⅱ GRADE FLY ASH ON PREPAREING HIGH-VOLUME FLY ASH CONCRETE

采用微观分析技术,研究了江西省当地产的Ⅱ级粉煤灰的性状,并选用当地典型原材料,采用超量取代的方法,选取5种不同掺量的粉煤灰,配制中等强度的大掺量粉煤灰混凝土(High Fly-ash ContentConcrete,简称HFCC),综合分析和探讨了大掺量粉煤灰混凝土的力学性能和耐久性。结果表明,与普通混凝土相比,采用江西省Ⅱ级灰配制的大掺量粉煤灰混凝土后期强度增幅显著,56d强度甚至能超过普通混凝土,弹性模量-强度比和抗渗性均高于普通混凝土,而抗冻性和抗碳化能力均有所下降。

The chacracter of the local Ⅱ grade fly ash from Jiangxi Province was studied using microanalysis technology , and medium strength grade of high fly-ash content concrete （abbreviation ： HFCC ） was prepared by Using five differem contents of fly ash and the other local typical raw materials of Jiangxi Province through high-substitute way , then the mechanical properties and durability of the concrete were discussed. The results show that the growth of later strength of HFCC is more substantial than the normal concrete , and its 56 d strength may be over that of the normal concrete , both of the elastic modulus-strength ratio and the permeability are above the normal concrete, but the anti-frost ability and anticarbonation ability are decreased.