|本期目录/Table of Contents|

[1]肖建庄,陈祥磊,李 标,等.纳米SiO2和粉煤灰复掺对再生混凝土性能的影响[J].建筑科学与工程学报,2020,37(01):26-32.[doi:10.19815/j.jace.2019.03027]
 XIAO Jian-zhuang,CHEN Xiang-lei,LI Biao,et al.Effect of Mixed Nano-SiO2 and Fly Ash on Properties of Recycled Aggregate Concrete[J].Journal of Architecture and Civil Engineering,2020,37(01):26-32.[doi:10.19815/j.jace.2019.03027]
点击复制

纳米SiO2和粉煤灰复掺对再生混凝土性能的影响(PDF)
分享到:

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
37卷
期数:
2020年01期
页码:
26-32
栏目:
出版日期:
2020-01-13

文章信息/Info

Title:
Effect of Mixed Nano-SiO2 and Fly Ash on Properties of Recycled Aggregate Concrete
文章编号:
1673-2049(2020)01-0026-07
作者:
肖建庄陈祥磊李 标薛松涛段珍华
(同济大学 土木工程学院,上海 200092)
Author(s):
XIAO Jian-zhuang CHEN Xiang-lei LI Biao XUE Song-tao DUAN Zhen-hua
(College of Civil Engineering, Tongji University, Shanghai 200092, China)
关键词:
再生混凝土 老砂浆 纳米SiO2 粉煤灰 质量取代法
Keywords:
recycled aggregate concrete old mortar Nano-SiO2 fly ash mass substitution method
分类号:
TU973.2
DOI:
10.19815/j.jace.2019.03027
文献标志码:
A
摘要:
使用质量取代法研究粉煤灰和纳米SiO2单掺及复掺对再生混凝土(RAC)工作性能、抗压强度(7,28,90 d)、抗折强度(28 d)和劈裂抗拉强度(28 d)的影响。浇筑试样时,基于现有的搅拌方式,提出了新的两阶段搅拌法,先将再生粗骨料和纳米SiO2、附加水进行搅拌,使得部分纳米SiO2颗粒能够被再生粗骨料吸收,用于填补老砂浆孔隙和微裂缝。结果表明:随着纳米SiO2掺量增加,再生混凝土的坍落度逐渐减小,复掺粉煤灰能够减少纳米SiO2引起的坍落度损失; 粉煤灰掺量不变的情况下,再生混凝土抗压、抗折和劈裂抗拉强度随着纳米SiO2掺量的增加而增加; 复掺纳米SiO2和粉煤灰不但能够补偿再生混凝土由粉煤灰引起的早期强度降低,而且90 d龄期抗压强度明显高于2种材料单掺的再生混凝土; 纳米SiO2掺量(质量分数)为1%时,再生混凝土在90 d龄期的抗压强度相对再生混凝土提高了3.0 MPa; 复掺纳米SiO2和粉煤灰对再生混凝土的抗折强度、劈裂抗拉强度也有显著提升,S2F30的抗折强度相对于F30增加了24.17%,且劈裂抗拉强度高于2种材料单掺的再生混凝土,相对于F30提高了12.68%。
Abstract:
The effects of fly ash and Nano-SiO2 on the workability, compressive strength(7, 28, 90 d), flexural strength(28 d)and splitting tensile strength(28 d)of recycled aggregate concrete(RAC)were studied by using mass substitution method. When casting the sample, a new two-stage mixing method was proposed based on the existing mixing method. The recycled coarse aggregate, Nano-SiO2 and additional water were stirred, so that some Nano-SiO2 particles could be absorbed by the recycled coarse aggregate to fill the pores and micro cracks of the old mortar. The results show that the slump of RAC decreases with the increase of Nano-SiO2 content, and the reduction of slump caused by Nano-SiO2 can be alleviated with the addition of fly ash. Under the condition of the same fly ash content, the compressive strength, flexural strength and splitting tensile strength of RAC grow up with the increased content of Nano-SiO2. With the combination of Nano-SiO2 and fly ash, not only the early strength reduction of RAC caused by fly ash can be compensated, but also the compressive strength of RAC at the age of 90 d is significantly higher than that of RAC adding the two materials respectively. When the mass fraction of Nano-SiO2 content is 1%, the compressive strength of recycled concrete at the age of 90 d increases by 3.0 MPa compared with RAC. The flexural strength and splitting tensile strength of RAC are significantly improved by adding both Nano-SiO2 and fly ash. The flexural strength of S2F30 is 24.17% higher than that of F30, and the splitting tensile strength of S2F30 is 12.68% higher than that of RAC mixed with Nano-SiO2 or fly ash alone.

参考文献/References:

[1] OTSUKI N,MIYAZATO S I,YODSUDJAI W.Influence of Recycled Aggregate on Interfacial Transition Zone,Strength,Chloride Penetration and Carbonation of Concrete[J].Journal of Materials in Civil Engineering,2003,15(5):443-451.
[2]李 娟.再生骨料附着砂浆对混凝土强度的影响及再生骨料二灰碎石试验研究[D].南京:河海大学,2005.
LI Juan.Influence of Mortar Adhesive to Recycled Aggregate on Strength of Concrete and Research of Lime-fly Ash Stabilized Recycle Aggregate[D].Nanjing:Hohai University,2005.
[3]SANCHEZ F,SOBOLEV K.Nanotechnology in Concrete — A Review[J].Construction and Building Materials,2010,24(11):2060-2071.
[4]JO B,KIM C,TAE G,et al.Characteristics of Cement Mortar with Nano-SiO2 Particles[J].Construction and Building Materials,2007,21(6):1351-1355.
[5]张津践.再生混凝土纳米强化技术及微观结构分析[D].杭州:浙江大学,2012.
ZHANG Jin-jian.Recycled Concrete's Nano-enhance Ment Technology and Microstructural Analysis[D].Hangzhou:Zhejiang University,2012.
[6]CHEN J,KOU S,POON C.Hydration and Properties of Nano-TiO2 Blended Cement Composites[J].Cement and Concrete Composites,2012,34(5):642-649.
[7]SINGH N B,KALRA M,SAXENA S K.Nanoscience of Cement and Concrete[J].Materials Today:Proceedings,2017,4(4):5478-5487.
[8]SALKHORDEH S,GOLBAZI P,AMINI H.The Improvement of 28-day Compressive Strength of Self-compacting Concrete Made by Different Percentages of Recycled Concrete Aggregates Using Nano-silica[J].International Journal of Civil and Environmental Engineering,2011,5(11):529-532.
[9]HOSSEINI P.Developing Concrete Recycling Strategies by Utilization of Nano-SiO2 Particles[J].Waste and Biomass Valorization,2011,2(3):347-355.
[10]HOSSEINI P,BOOSHEHRIAN A,DELKASH M,et al.Use of Nano-SiO2 to Improve Microstructure and Compressive Strength of Recycled Aggregate Concretes[C]//BITTNAR Z,BARTOS P J M,MEMECEK J,et al.Nanotechnology in Construction 3.Berlin:Springer,2009:215-221.
[11]HOU P,KAWASHIMA S,WANG K,et al.Effects of Colloidal Nanosilica on Rheological and Mechanical Properties of Fly Ash-cement Mortar[J].Cement and Concrete Composites,2013,35(1):12-22.
[12]SENFF L,LABRINCHA J A,FERREIRA V M,et al.Effect of Nano-silica on Rheology and Fresh Properties of Cement Pastes and Mortars[J].Construction and Building Materials,2009,23(7):2487-2491.
[13]LIMBACHIYA M,MEDDAH M S,OUCHAGOUR Y.Use of Recycled Concrete Aggregate in Fly-ash Concrete[J].Construction and Building Materials,2012,27(1):439-449.
[14]KOU S,POON C.Long-term Mechanical and Durability Properties of Recycled Aggregate Concrete Prepared with the Incorporation of Fly Ash[J].Cement and Concrete Composites,2013,37:12-19.
[15]CHINDAPRASIRT P,HOMWUTTIWONG S,SIRI-VIVATNANON V.Influence of Fly Ash Fineness on Strength,Drying Shrinkage and Sulfate Resistance of Blended Cement Mortar[J].Cement and Concrete Research,2004,34(7):1087-1092.
[16]GENG J,SUN J.Characteristics of the Carbonation Resistance of Recycled Fine Aggregate Concrete[J].Construction and Building Materials,2013,49:814-820.
[17]QUERCIA G,HUSKEN G,BROUWERS H J H.Water Demand of Amorphous Nano Silica and Its Impact on the Workability of Cement Paste[J].Cement and Concrete Research,2012,42(2):344-357.
[18]SHAIKH F,CHAVDA V,MINHAJ N,et al.Effect of Mixing Methods of Nano Silica on Properties of Recycled Aggregate Concrete[J].Structural Concrete,2018,19(2):387-399.
[19]LI W,LONG C,TAM V W Y,et al.Effects of Nano-particles on Failure Process and Microstructural Properties of Recycled Aggregate Concrete[J].Construction and Building Materials,2017,142:42-50.
[20]XIAO J Z,LI J B,ZHANG C.Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading[J].Cement and Concrete Research,2005,35(6):1187-1194.
[21]MUKHARJEE B B,BARAI S V.Influence of Nano-silica on the Properties of Recycled Aggregate Concrete[J].Construction and Building Materials,2014,55:29-37.
[22]SHAIKH F U A,SUPIT S W M,SARKER P K.A Study on the Effect of Nano Silica on Compressive Strength of High Volume Fly Ash Mortars and Concretes[J].Materials & Design,2014,60:433-442.

相似文献/References:

[1]丁发兴,方常靖,龚永智,等.再生混凝土单轴力学性能指标统一计算方法[J].建筑科学与工程学报,2014,31(04):16.
 DING Fa-xing,FANG Chang-jing,GONG Yong-zhi,et al.Unified Calculation Method of Uniaxial Mechanical Performance Index of Recycled Concrete[J].Journal of Architecture and Civil Engineering,2014,31(01):16.
[2]丁 陶,肖建庄.基于振动台试验的预制再生混凝土框架后浇边节点分析[J].建筑科学与工程学报,2013,30(03):78.
 DING Tao,XIAO Jian-zhuang.Analysis of Cast-in-situ Exterior Joints of Precast Recycled Aggregate Concrete Frame by Shaking Table Tests[J].Journal of Architecture and Civil Engineering,2013,30(01):78.
[3]肖建庄,郑世同,王 静.再生混凝土长龄期强度与收缩徐变性能[J].建筑科学与工程学报,2015,32(01):21.
 XIAO Jian-zhuang,ZHENG Shi-tong,WANG Jing.Long-term Strength, Shrinkage and Creep Properties of Recycled Aggregate Concrete[J].Journal of Architecture and Civil Engineering,2015,32(01):21.
[4]肖建庄,刘 胜,TRESSERRAS Joan.钢管/GFRP管约束再生混凝土柱偏心受压试验[J].建筑科学与工程学报,2015,32(02):21.
 XIAO Jian-zhuang,LIU Sheng,TRESSERRAS Joan.Eccentric Loading Test on Recycled Aggregate Concrete Columns Confined by Steel Tube/GFRP Tube[J].Journal of Architecture and Civil Engineering,2015,32(01):21.
[5]谢建和,李自坚,孙明炜.硅粉对纤维橡胶再生混凝土抗压性能影响试验[J].建筑科学与工程学报,2016,33(03):72.
 XIE Jian-he,LI Zi-jian,SUN Ming-wei.Experiment About Influence of Silica Fume on Compressive Performance of Fiber Reinforced Rubber Recycled Concrete[J].Journal of Architecture and Civil Engineering,2016,33(01):72.
[6]肖建庄,李宏,亓萌.基于静载强度分布的再生混凝土疲劳强度预测[J].建筑科学与工程学报,2010,27(04):7.
 XIAO Jian-zhuang,LI Hong,QI Meng.Fatigue Strength Prediction of Recycled Aggregate ConcreteBased on Static Strength Distribution[J].Journal of Architecture and Civil Engineering,2010,27(01):7.
[7]肖建庄,朱永明,王璞瑾,等.再生混凝土U型叠合梁抗剪性能[J].建筑科学与工程学报,2012,29(02):1.
 XIAO Jian-zhuang,ZHU Yong-ming,WANG Pu-jin,et al.Shear Behavior of Recycled Concrete U-shaped Composite Beams[J].Journal of Architecture and Civil Engineering,2012,29(01):1.
[8]肖建庄,黄运标,郑永朝.高温后再生混凝土的残余抗折强度[J].建筑科学与工程学报,2009,26(03):32.
 XIAO Jian-zhuang,HUANG Yun-biao,ZHENG Yong-chao.Residual Flexural Strength of Recycled ConcreteAfter Elevated-temperatures[J].Journal of Architecture and Civil Engineering,2009,26(01):32.
[9]肖建庄,雷斌.再生混凝土碳化模型与结构耐久性设计[J].建筑科学与工程学报,2008,25(03):66.
 XIAO Jian-zhuang,LEI Bin.Carbonation Model and Structural Durability Design for Recycled Concrete[J].Journal of Architecture and Civil Engineering,2008,25(01):66.
[10]郭 凯,马浩辉,王 强.氧化石墨烯对再生混凝土界面过渡区的影响[J].建筑科学与工程学报,2018,35(05):217.
 GUO Kai,MA Hao-hui,WANG Qiang.Effect of Graphene Oxide on Interfacial Transition Zone of Recycled Concrete[J].Journal of Architecture and Civil Engineering,2018,35(01):217.

备注/Memo

备注/Memo:
收稿日期:2019-04-07
基金项目:科技部中日合作重点项目(2016YFE0118200); 国家自然科学基金重点项目(51438007)
作者简介:肖建庄(1968-),男,山东沂南人,教授,博士研究生导师,工学博士,E-mail:jzx@tongji.edu.cn。
更新日期/Last Update: 2020-01-13