不同类型机制砂中粉体种类及含量对MB值的影响
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摘要
研究铁尾矿、花岗岩、石灰石及再生骨料4种机制砂中粉体材性、比表面积及含量对MB值测试结果的影响规律。结果表明,随铁尾矿、花岗岩、石灰石粉体细度及含量的增加,MB值均呈显著的线性增加趋势,表明上述材性机制砂均对亚甲蓝有一定吸附能力,且铁尾矿较强而石灰石较弱;再生骨料机制砂中粉体细度变化对MB值影响不大;云母矿物的存在可能影响机制砂自身吸附能力;机制砂中含泥量变化对机制砂MB值测试结果影响显著;泥粉含量>4%时,MB值可能达到或超过1. 4;当机制砂中同时存在石粉和泥粉时,2类粉体各自独立地对MB值产生影响。
The effects of the material types,specific surface area and content of the powders on the MB values for four kinds of manufactured sand such as iron tailings,granite,limestone and recycled aggregate are studied. The results show that the MB values trend to grow linearly following fineness and content of powder of iron tailings,granite and limestone. It is proved that the manufactured sands above all have a certain adsorption capacity for Methylene blue,and the iron tailing is stronger while the limestone is weaker. The variations of powder fineness have less influence on MB values for recycled aggregate manufactured sand. The effect of content of mica minerals on the self-adsorption capacity of manufactured sand seem to be very important. The clay content is the key factor to MB values of the manufactured sand. The clay content in the manufactured sand is beyond 4% with high probability of MB values equal or above 1. 4. As the manufactured sand contain both stone powder and clay,the two powders make a contribution to MB values respectively.
The effects of the material types,specific surface area and content of the powders on the MB values for four kinds of manufactured sand such as iron tailings,granite,limestone and recycled aggregate are studied. The results show that the MB values trend to grow linearly following fineness and content of powder of iron tailings,granite and limestone. It is proved that the manufactured sands above all have a certain adsorption capacity for Methylene blue,and the iron tailing is stronger while the limestone is weaker. The variations of powder fineness have less influence on MB values for recycled aggregate manufactured sand. The effect of content of mica minerals on the self-adsorption capacity of manufactured sand seem to be very important. The clay content is the key factor to MB values of the manufactured sand. The clay content in the manufactured sand is beyond 4% with high probability of MB values equal or above 1. 4. As the manufactured sand contain both stone powder and clay,the two powders make a contribution to MB values respectively.
引文
[1]颜从进.机制砂特性对混凝土性能的影响研究[D].重庆:重庆大学,2014.
[2]左文銮,魏勇,陈雷,等.机制砂MB值对混凝土性能的影响[J].商品混凝土,2013(11):38-42.
[3] STEWART J G,NORVELL J K,Fowler D W. Influence of microfine aggregate characteristics on concrete performance[J].Journal of materials in civil engineering,2007,19(11):957-964.
[4] HOSKING J R,PIKE D C.The methylene blue adsorption test in relation to aggregate drying shrinkage[J]. Journal of chemical technology and biotechnology, chemical technology,1985,35(4):185-1994.
[5]刘秀美.机制砂作混凝土细骨料的研究[D].济南:济南大学,2013.
[6]沈卫国,杨振国,邹晓丹,等.机制砂MB值的影响因素定量研究[J].武汉理工大学学报,2013,35(12):44-47.
[7]胡兵,刘加平,刘建忠,等.砂泥粉含量及MB值与砂浆干燥收缩关系的研究[J].混凝土,2010(4):107-109.
[8] WANG J L,NIU K M,TIAN B,et al. Effect of methylene blue(MB)value of manufactured sand on the durability of concretes[J]. Journal of Wuhan University of Technology(Materials Science Edition),2012,27(6):1160-1164.
[9] KOEHLER E P,FOWLER D W. Dust-of-fracture aggregate microfines in self-consolidating concrete[J]. Aci Mater J,2008,105(2):165-173.
[10] AASHTO Standards TP57(2000). Standard Test Method for Methylene Blue Value of Clays Mineral Fillers,and Fines[S].
[11] Standard Specification for Concrete Aggregates:ASTM C33/C33M-18[S].
[12]中国砂石协会,北京建筑工程学院,建筑材料工业技术监督研究中心.建设用砂:GB/T14684—2011[S].北京:中国标准出版社,2012.
[13] LI X G.Use of man-made sand with high content stone powder in concrete[J].Journal of building materials,2004,7(1):66-71.
[2]左文銮,魏勇,陈雷,等.机制砂MB值对混凝土性能的影响[J].商品混凝土,2013(11):38-42.
[3] STEWART J G,NORVELL J K,Fowler D W. Influence of microfine aggregate characteristics on concrete performance[J].Journal of materials in civil engineering,2007,19(11):957-964.
[4] HOSKING J R,PIKE D C.The methylene blue adsorption test in relation to aggregate drying shrinkage[J]. Journal of chemical technology and biotechnology, chemical technology,1985,35(4):185-1994.
[5]刘秀美.机制砂作混凝土细骨料的研究[D].济南:济南大学,2013.
[6]沈卫国,杨振国,邹晓丹,等.机制砂MB值的影响因素定量研究[J].武汉理工大学学报,2013,35(12):44-47.
[7]胡兵,刘加平,刘建忠,等.砂泥粉含量及MB值与砂浆干燥收缩关系的研究[J].混凝土,2010(4):107-109.
[8] WANG J L,NIU K M,TIAN B,et al. Effect of methylene blue(MB)value of manufactured sand on the durability of concretes[J]. Journal of Wuhan University of Technology(Materials Science Edition),2012,27(6):1160-1164.
[9] KOEHLER E P,FOWLER D W. Dust-of-fracture aggregate microfines in self-consolidating concrete[J]. Aci Mater J,2008,105(2):165-173.
[10] AASHTO Standards TP57(2000). Standard Test Method for Methylene Blue Value of Clays Mineral Fillers,and Fines[S].
[11] Standard Specification for Concrete Aggregates:ASTM C33/C33M-18[S].
[12]中国砂石协会,北京建筑工程学院,建筑材料工业技术监督研究中心.建设用砂:GB/T14684—2011[S].北京:中国标准出版社,2012.
[13] LI X G.Use of man-made sand with high content stone powder in concrete[J].Journal of building materials,2004,7(1):66-71.