浅析粉煤灰中的铵盐对混凝土工程质量的危害及应对办法  

Analysis on the Harm of Ammonium Salt in Fly Ash to the Quality of Concrete Engineering and Countermeasures

作　　者：李凤玉[1] 娄鑫[1] LI Fengyu;LOU Xin(Sinohydro Bureau 7 Co.,Ltd.,Chengdu Sichuan 611730)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都611730

出　　处：《四川水力发电》2023年第S01期135-138,142,共5页Sichuan Hydropower

摘　　要：粉煤灰是目前混凝土生产过程中的常用的材料组分之一,在混凝土中具有火山灰效应、形态效应、微集料反应和界面效应,粉煤灰的使用在节约混凝土成本的同时能极大地改善混凝土各项性能。而近年来,在混凝土浇筑过程中出现混凝土拌和物中有异味、硬化混凝土表面局部出现气泡集中、混凝土强度异常波动等现象。经研究分析认为:产生上述现象的原因和粉煤灰生产过程中脱硫脱硝工艺中残留的脱硝剂及副产物有关。研究其产生机理,设计试验检测方法,进而达到切实控制的目的,避免产生的氨气对人体健康、混凝土质量和结构安全带来隐患。Fly ash is one of the commonly used components used in concrete producing process.It has pozzolanic effect,morphology effect,micro-aggregate reaction and interface effect in concrete.The use of fly ash can save the cost of concrete and greatly improve its performance.However,in recent years,during the process of concrete placing,there have been phenomena such as peculiar odor of the concrete mixture,concentrated bubble on the partial surface of hardened concrete and abnormal fluctuation of compressive strength of concrete.After research and analysis,it is believed that the reason of the above phenomenon is related to the residual denitrification agent and by-products in the process of desulfurization and denitrification technologies in the production of fly ash.The mechanism of its production is studied and the test method is designed to achieve the purpose of effective control and avoid the hidden dangers of the produced ammonia gas to human health,concrete quality and structure safety.

关 键 词：粉煤灰 铵盐 检测方法 

分 类 号：TQ113.7[化学工程—无机化工]