2014年5月上第43卷第9期
DOI:10.7672/sgjs2014090023
施工技术
CONSTRUCTION TECHNOLOGY
石灰石粉的特性及对混凝土性能的影响
周永祥2，王永海，王思娅，王伟，丁威，张大朋
（1.中国建筑科学研究院，北京100013；2.全国混凝土标准化技术委员会，北京100013）
【摘要】结合行业标准《石灰石粉在混凝土中应用技术规程》的制定，系统研究了石灰石粉的吸附特性以及石灰石的倾向；对于C30混凝土，20%石灰石粉等量取代粉煤灰，不会造成抗压强度、抗碳化性能、抗冻性能下降，适当含泥量对上述性能影响也不大；掺加石灰石粉会对混凝土的抗氯离子渗透性能和抗硫酸盐侵蚀性能有所降低，但掺量为20%时影响不大；当掺量达到50%时，混凝土抗氯离子渗透性能和抗冻性能显著降低。引气可以有效提高混
凝土的抗冻性能，也能在一定程度上提高抗硫酸盐侵蚀能力。【关键词］混凝土；石灰石粉；吸附性；耐久性；工作性
［中图分类号］TU528
【文献标识码］A
[文章编号】1002-8498(2014)09-0023-05
TheCharacteristicofLimestonePowderandItsEffect
onPerformanceofConcrete
Zhou Yongxiang',,Wang Yonghai’,Wang Siya',Wang Wei',Ding Wei',Zhang Dapeng
(1. China Academy of Building Research, Bejing 100013, China;
2. National Technical Committee 458 on Concrete of Standardization Administration of Chind, Bejing 100013, China) Abstract : Combining with the constitution of the Technical specification for the application of the limestone powder in the concrete, the adsorption properties of the limestone powder and its effect on the performance of concrete are studied systematically. It can be learned from the research that the limestone powder accelerates the slump loss of concrete mixture although the adsorption properties of the limestone powder to water and admixture are less. Replacing 20% of the fly ash by limestone powder in C30 concrete as well as appropriate sediment percentage will not reduce the compressive strength, the property of anti-carbonate and frost resistance. Adding limestone powder can reduce the ability of anti-chloride ion
limestone powder adding will reduce the ability of chloride resistance and frost resistance obviously. Air-entraining will increase the property of frost resistance significantly and improve the ability of resisting sulfate attack in a certain extend.
Key words: concrete; limestone powder; adsorption; durability; workability
由于我国持续以较高速度进行基本建设，粉煤灰、矿渣粉这类优质的混凝土掺和料日益紧缺，有的地区甚至出现脱销现象。立足当地资源，寻找一种容易获取、优质廉价的新型掺和料势在必行。石灰石粉是一种易于粉磨、价格低廉、运输方便的材料。国内外的研究和工程应用表明13]，混凝土掺加石灰石粉需水量小，具有明显的减水效应，合理
*国家“十二五"科技支撑计划课题"固体废弃物本地化再生建材利用成套技术（2008BAE61B05）
[作者简介］周永祥，博士，副研究员，E-mail;xiangzizhou@gmail.com【收稿日期］2014-01-03
23
掺用可以有效降低混凝土的用水量，改善混凝土的流动性与和易性。近来的研究4]显示，石灰石粉不但可以发挥微细填料的作用，显著改善混凝土体系的微细颗粒体系的级配组成，而且石灰石粉也具有一定的水化活性，对胶凝材料体系的早期水化具有促进作用。在发达国家，石灰石粉已被广泛用作混凝土惰性矿物掺和料，已有很多大型工程应用石灰石粉混凝土。例如，日本明石大桥、法国西瓦克斯核电站Ⅱ号反应堆等，美国、瑞典等国家还采用石灰石粉配制自密实混凝土和高流动性混凝土[5]
石灰石粉的应用，一方面作为替代性资源，可