黄河中下游水闸混凝土碳化深度研究

Study on Sluice Concrete Carbonation Depth in the Middle and Lower Yellow River

为得到黄河中下游水闸混凝土碳化深度的变化规律,并揭示其对混凝土强度的影响,利用43座水闸现场安全检测混凝土强度和相对应碳化深度的数据,通过统计分析方法研究了黄河中下游水闸不同构件的混凝土碳化深度以及不同地区、不同设计强度混凝土碳化深度与强度之间的关系。结果表明:黄河中下游水闸碳化深度自闸底板起随相对高程增加而变大;13~51 a龄期内,混凝土强度等级为C18的混凝土比C13混凝土抗碳化能力强;黄河中下游不同地区的水闸混凝土强度增加量均随着碳化深度的增加先增大后减小。由此可见,混凝土强度等级越高,其抗碳化能力越强,且随着混凝土碳化深度的增加,混凝土强度增加量先增加后减小。

In order to obtain concrete carbonation rules and reveal its influenceto the concrete strength,it used the data of 43 sluice sites safety testing concrete strength and corresponding carbonation depth. Through statistical analysis method,it studied different components of concrete carbonation depth in the middle and lower reaches of the Yellow River sluices and the relationship between the strength of concrete carbonation depth and strength in the different regions and different design strengths. The results show that carbonation depth increases gradually along the height direction in the middle and lower reaches of the Yellow River sluice; within the 13-51 age,the carbonation resistance ability of C18 design strength of concrete is superior to the ability of C13 design strength of concrete; In different regions of the middle and lower reaches of the Yellow River sluice,with the increase of carbonation depth,concrete strength first increases and then decreases. Thus,the higher the concrete strength,the stronger their resistance to the carbonation and with the increase of concrete carbonation depth,the concrete strength firstly increases and then decreases.