粉煤灰-偏高岭土-石粉对混凝土微结构及早期收缩的影响研究
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摘要
以偏高岭土、粉煤灰和石粉作为复合掺和料,结合混凝土孔结构、界面过渡区(ITZ)及水化热等表征研究多元复合掺合料对混凝土抗压强度及早期收缩性能的影响。研究结果表明:粉煤灰-偏高岭土-石灰石粉多元复合掺和料对混凝土抗压强度有促进作用,其28 d龄期强度增长10%以上,降低孔隙率,减少混凝土试样200 h收缩率13%~23%,且收缩率随着石粉含量增加和偏高岭土含量增加而降低。偏高岭土复合掺和料加速了水泥水化反应过程,促进了CSH凝胶的快速形成,密实了界面过渡区。
Effects of component admixtures based on metakaolin,fly ash and limestone powder on compressive strength and early age shrinkage of concrete by combination with pore structure,Interfacial Transition Zone( ITZ) and hydration heat were investigated. The experimental results show that the multi component admixtures improve the compressive strength of concrete and increase more than 10% at 28 d.Pore structure has been refined. The drying shrinkage has been reduced by 13%-23% at 200 h and the shrinkage decreases with the increasing oflimestone powder and metakaolin content. Component admixtures accelerate the hydration of cement, improve the formation of CSH gels and make the interfacial transition zone denser.
Effects of component admixtures based on metakaolin,fly ash and limestone powder on compressive strength and early age shrinkage of concrete by combination with pore structure,Interfacial Transition Zone( ITZ) and hydration heat were investigated. The experimental results show that the multi component admixtures improve the compressive strength of concrete and increase more than 10% at 28 d.Pore structure has been refined. The drying shrinkage has been reduced by 13%-23% at 200 h and the shrinkage decreases with the increasing oflimestone powder and metakaolin content. Component admixtures accelerate the hydration of cement, improve the formation of CSH gels and make the interfacial transition zone denser.
引文
[1]刘艳,张树河.偏高岭土对砼耐久性能的影响[J].水泥工程,2007(3):69-72.
[2]李鑫,邢锋,康飞宇.偏高岭土及其复合粉改善混凝土氯离子导电量的研究[J].材料科学与工程学报,2004,22(6):809-812.
[3]Zhang M H,Malhotra V M.Characteristics of a thermally activated alumino-silicate pozzolanic material and its use in concrete[J].Cement&Concrete Research,1995,25(8):1713-1725.
[4]Poon C S,Kou S C,Lam L.Compressive strength,chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete[J].Construction&Building Materials,2005,20(10):858-865.
[5]Ramlochan T,Thomas M,Gruber K A.The effect of metakaolin on alkali-silica reaction in concrete[J].Cement&Concrete Research,2000,30(3):339-344.
[6]Khatib J M,Wild S.Sulphate resistance of metakaolin mortar[J].Cement&Concrete Research,1998,28(1):83-92.
[7]陈益兰,赵亚妮,李静,等.偏高岭土替代硅灰配制高性能混凝土[J].硅酸盐学报,2004,32(4):524-529.
[8]Caldarone M A,Gruber K A,Burg R G.High-reactivity metakaolin:A new generation mineral admixture[J].Cement and Concrete Research,1994,16(11):37-40.
[9]Mardani-Aghabaglou A,Sezer G,Ramyar K.Comparison of fly ash,silica fume and metakaolin from mechanical properties and durability performance of mortar mixtures view point[J].Construction&Building Materials,2014,70:17-25.
[10]刘志勇.不同温湿度环境粉煤灰混凝土与基准混凝土收缩性能试验研究[J].土木工程学报,2009(5):69-73.
[11]王靖,王万金,夏义兵,等.超细粉煤灰对混凝土强度及水化产物的影响[J].混凝土与水泥制品,2016(12):24-26.
[12]吴政.粉煤灰混凝土收缩性能影响因素的分析[J].低温建筑技术,2016,38(12).
[13]李观书.粉煤灰混凝土抗硫酸盐侵蚀性能(英文)[J].硅酸盐学报,2012,40(1):39-48.
[14]郭育霞,贡金鑫,李晶.石粉掺量对混凝土力学性能及耐久性的影响[J].建筑材料学报,2009,12(3):266-271.
[15]张礼华,刘来宝,周永生,等.石粉含量对机制砂混凝土力学性能与微观结构的影响[J].混凝土与水泥制品,2011(12):22-26.
[16]范德科,马强,周宗辉,等.石粉对机制砂混凝土性能的影响[J].硅酸盐通报,2016,35(3):913-917.
[17]沈洋.硅灰对硬化水泥浆体早期收缩的影响[J].建筑材料学报,2002,5(4):375-378.
[2]李鑫,邢锋,康飞宇.偏高岭土及其复合粉改善混凝土氯离子导电量的研究[J].材料科学与工程学报,2004,22(6):809-812.
[3]Zhang M H,Malhotra V M.Characteristics of a thermally activated alumino-silicate pozzolanic material and its use in concrete[J].Cement&Concrete Research,1995,25(8):1713-1725.
[4]Poon C S,Kou S C,Lam L.Compressive strength,chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete[J].Construction&Building Materials,2005,20(10):858-865.
[5]Ramlochan T,Thomas M,Gruber K A.The effect of metakaolin on alkali-silica reaction in concrete[J].Cement&Concrete Research,2000,30(3):339-344.
[6]Khatib J M,Wild S.Sulphate resistance of metakaolin mortar[J].Cement&Concrete Research,1998,28(1):83-92.
[7]陈益兰,赵亚妮,李静,等.偏高岭土替代硅灰配制高性能混凝土[J].硅酸盐学报,2004,32(4):524-529.
[8]Caldarone M A,Gruber K A,Burg R G.High-reactivity metakaolin:A new generation mineral admixture[J].Cement and Concrete Research,1994,16(11):37-40.
[9]Mardani-Aghabaglou A,Sezer G,Ramyar K.Comparison of fly ash,silica fume and metakaolin from mechanical properties and durability performance of mortar mixtures view point[J].Construction&Building Materials,2014,70:17-25.
[10]刘志勇.不同温湿度环境粉煤灰混凝土与基准混凝土收缩性能试验研究[J].土木工程学报,2009(5):69-73.
[11]王靖,王万金,夏义兵,等.超细粉煤灰对混凝土强度及水化产物的影响[J].混凝土与水泥制品,2016(12):24-26.
[12]吴政.粉煤灰混凝土收缩性能影响因素的分析[J].低温建筑技术,2016,38(12).
[13]李观书.粉煤灰混凝土抗硫酸盐侵蚀性能(英文)[J].硅酸盐学报,2012,40(1):39-48.
[14]郭育霞,贡金鑫,李晶.石粉掺量对混凝土力学性能及耐久性的影响[J].建筑材料学报,2009,12(3):266-271.
[15]张礼华,刘来宝,周永生,等.石粉含量对机制砂混凝土力学性能与微观结构的影响[J].混凝土与水泥制品,2011(12):22-26.
[16]范德科,马强,周宗辉,等.石粉对机制砂混凝土性能的影响[J].硅酸盐通报,2016,35(3):913-917.
[17]沈洋.硅灰对硬化水泥浆体早期收缩的影响[J].建筑材料学报,2002,5(4):375-378.