摘要
为探讨中国快速砂浆棒法（CAMBT）与其它集料碱活性快速检测法的相关性及对国外岩石的适应性，采用混凝土棱柱体法（CPT）、快速砂浆棒法（AMBT）、压蒸法和CAMBT研究了11种国外不同源集料的膨胀行为，同时还研究了集料颗粒尺寸对CAMBT中集料膨胀的影响．结果表明：CAMBT，AMBT及压蒸法的检测结果具有一致性，但均不能完全正确地判定这些集料的碱活性，它们在夸大RG集料碱活性的同时，还漏判了PO集料的碱活性；集料在现有快速法中的膨胀率与其在CPT中的膨胀率无明显相关性，因此快速法不能很好地表征集料在混凝土中的碱活性程度；CAMBT中集料颗粒尺寸对不同集料膨胀程度的影响不同，其中0．15～0．80mm集料颗粒尺寸对集料膨胀而言不是最敏感粒级；采用2．5～5．0mm单粒级集料颗粒，可以比现有标准检测方法更好地预测集料在混凝土中的膨胀行为．
For assessing the applicability of Chinese Accelerated Mortar Bar Test（CAMBT） for alkali reactivity of concrete aggregates to oversea＇s rocks and the correlations between CAMBT and other accelerated tests, i.e. Accelerated Mortar Bar Test（AMBT）, Chinese Autoclave Method, expansion behaviors of 11 aggregates from different origins were studied in the Concrete Prism Test（CPT） and in various accelerated tests. The effect of aggregate particle size on aggregate expansion in the CAMBT was also studied. Results show that the outcomes for the aggregates from different accelerated tests are in agreement, but none of these tests can properly predict the reactive characteristics of all the aggregates with exaggerating the alkali reactivity of RG aggregate and failing to recognize the alkali reactive character of PO aggregate. There is no satisfactory correlation between expansion rates in the existing accelerated tests and in the CPT. Expansion rates in accelerated tests can not determine the reactive degree of concrete aggregates. The aggregate particle size has different influences on various aggregates and the 0.15-0.80 mm particle is not the most sensitive size to aggregate expansion in the CAMBT. With 2.5-5.0 mm aggregate particles, the reactive character and reactive degree in concrete of most of the tested aggregates can be satisfactorily predicted in the CAMBT.
出处
《建筑材料学报》
EI
CAS
CSCD
2006年第4期493-499,共7页
Journal of Building Materials
基金
国家重点基础研究发展规划项目(2001CB610706)
江苏省高校自然科学研究计划项目(05KJB430046)
教育部留学回国人员科研启动基金资助项目(2005383)
关键词
碱-集料反应
碱-硅酸反应
快速检测法
颗粒尺寸
alkali-aggregate reaction
alkali-silica reaction
accelerated test
particle size
