纳米SiO_2超高强高流态混凝土及改性机理
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摘要
通过正交试验提出纳米超高强高流态混凝土的胶凝材料配合比设计参数,并研究了纳米SiO_2的掺入对传统掺硅灰、粉煤灰超高强水泥基胶凝材料强度及工作性能的影响。在保证水胶比不变的条件下,开展了混凝土配合比试验,并研究了纳米SiO_2对混凝土抗压强度的影响及其微观机理。结果表明:超高强高流态混凝土中胶凝材料最优比例为:纳米SiO_2:硅灰:粉煤灰:水泥=1:8:20:71;在胶凝材料用量为600～1 000kg/m~3范围内,随着其掺量的增加,混凝土流动度不断增加,抗压强度先增大后减小,当其掺量为800kg/m~3时,抗压强度最大。分析认为,纳米SiO_2、硅灰与粉煤灰形成的三元多尺度堆积体系能优化粉体材料在混凝土中的微集料密实填充效应,纳米SiO_2的二次水化反应也有效改善了硬化水泥石的微观结构,并优化其形态分布,进一步增大其强度。
The design parameters of cementitious materials mixture ratio of nano ultra-high strength and high-flow concrete were proposed by orthogonal test,and the influence of nano-SiO_2 on the strength and workability of traditional ultra-high strength cement-based material doped silica fume and fly ash was studied.Same water-binder ratio,the concrete mix proportion test was carried out.Afterwards,the effect and mechanism of nano-SiO_2 on the compressive strength of concrete were explored.The results indicated that the optimum ratio of cementitious material in ultra-high strength and high-flow concrete is:nano-SiO_2:silica fume:fly ash:cement=1:8:20:71.In the range of 600～1 000 kg/m~3,its fluidity has increased with increase of cementitious material,the compressive strength first increases and then decreases,with the maximum compressive strength of cementitious material of 800 kg/m~3.It is concluded that the ternary multiscale stacking system formed by nano-SiO_2,silica fume and fly ash can optimize the compaction effect of powder materials in concrete micro-aggregates.Additionally,the secondary reaction of hydration reaction of nano-SiO_2 also improves the micro-structure of hardened cement stone and optimizes its morphology distribution,further increased its strength.
The design parameters of cementitious materials mixture ratio of nano ultra-high strength and high-flow concrete were proposed by orthogonal test,and the influence of nano-SiO_2 on the strength and workability of traditional ultra-high strength cement-based material doped silica fume and fly ash was studied.Same water-binder ratio,the concrete mix proportion test was carried out.Afterwards,the effect and mechanism of nano-SiO_2 on the compressive strength of concrete were explored.The results indicated that the optimum ratio of cementitious material in ultra-high strength and high-flow concrete is:nano-SiO_2:silica fume:fly ash:cement=1:8:20:71.In the range of 600～1 000 kg/m~3,its fluidity has increased with increase of cementitious material,the compressive strength first increases and then decreases,with the maximum compressive strength of cementitious material of 800 kg/m~3.It is concluded that the ternary multiscale stacking system formed by nano-SiO_2,silica fume and fly ash can optimize the compaction effect of powder materials in concrete micro-aggregates.Additionally,the secondary reaction of hydration reaction of nano-SiO_2 also improves the micro-structure of hardened cement stone and optimizes its morphology distribution,further increased its strength.
引文
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[20]李伟,朱浮声,王晓初,等.纳米混凝土的制备及其干缩性能研究[J].东北大学学报(自然科学版),2017,38(8):1173-1176,1194.LI W,ZHU F S,WANG X C,et al.Preparation and dry-shrinkage performance of nano-concrete[J].Journal of Northeastern University(Natural Science),2017,38(8):1173-1176,1194.(in Chinese)
[21]叶青,张泽南,孔德玉,等.掺纳米SiO2和掺硅粉高强混凝土性能的比较[J].建筑材料学报,2003,6(4):381-385.YE Q,ZHANG Z N,KONG D Y,et al.Comparison of properties of high strength concrete with nano-SiO2and silica fume added[J].Journal of Building Materials,2003,6(4):381-385.(in Chinese)
[22]王冲.特超强高性能混凝土的制备及其结构与性能研究[D].重庆:重庆大学,2005.WANG C.Research on preparation,structure and performance of ultra high strength high performance concrete[D].Chongqing:Chongqing University,2005.(in Chinese)
[2]吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999.WU Z W,LIAN H Z.High performance concrete[M].Beijing:China Railway Publishing House,1999.(in Chinese)
[3]BROOKS J J,WAINWRIGHT P J.Properties of ultrahigh-strength concrete containing a superplasticizer[J].Magazine of Concrete Research,1983,35(125):205-213.
[4]NEVILLE A,AITCIN P C.High performance concrete:An overview[J].Materials and Structures,1998,31(2):111-117.
[5]冷发光,冯乃谦.矿渣掺量对高强高性能混凝土强度和耐久性影响的试验研究[J].中国建材科技,2000,9(1):14-17,41.LENG F G,FENG N Q.An experimental study of effect of quantity of blast furnace slap on the strength and durability of high strength concrete and high performance concrete[J].China Building Materials Science&Technology,2000,9(1):14-17,41.(in Chinese)
[6]蒲心诚,王冲,王志军,等.C100~C150超高强高性能混凝土的强度及变形性能研究[J].混凝土,2002(10):3-7,33.PU X C,WANG C,WANG Z J,et al.The study on strengths and deformability of C100~C150 super high strength&high performance concrete[J].Concrete,2002(10):3-7,33.(in Chinese)
[7]张志豪,余睿,水中和,等.生态型超高强混凝土的制备与性能研究[J].混凝土与水泥制品,2018(1):1-5.ZHANG Z H,YU R,SHUI Z H,et al.Study on preparation and properties of eco-friendly ultra-high strength concrete[J].China Concrete and Cement Products,2018(1):1-5.(in Chinese)
[8]MANZUR T,YAZDANI N.Optimum mix ratio for carbon nanotubes in cement mortar[J].KSCE Journal of Civil Engineering,2015,19(5):1405-1412.
[9]CAI Y M,HOU P K,CHENG X,et al.The effects of nano SiO2 on the properties of fresh and hardened cement-based materials through its dispersion with silica fume[J].Construction and Building Materials,2017,148:770-780.
[10]HOU P K,CHENG X,QIAN J S,et al.Characteristics of surface-treatment of nano-SiO2 on the transport properties of hardened cement pastes with different waterto-cement ratios[J].Cement and Concrete Composites,2015,55:26-33.
[11]LI R,HOU P K,XIE N,et al.Design of SiO2/PMHShybrid nanocomposite for surface treatment of cementbased materials[J].Cement and Concrete Composites,2018,87:89-97.
[12]WANG D,HOU P K,YANG P,et al.BiOBr@SiO2flower-like nanospheres chemically-bonded on cementbased materials for photocatalysis[J].Applied Surface Science,2018,430:539-548.
[13]KHALOO A,MOBINI M H,HOSSEINI P.Influence of different types of nano-SiO2particles on properties of high-performance concrete[J].Construction and Building Materials,2016,113:188-201.
[14]WU Z M,SHI C J,KHAYAT K H,et al.Effects of different nanomaterials on hardening and performance of ultra-high strength concrete(UHSC)[J].Cement and Concrete Composites,2016,70:24-34.
[15]王立国,张树鹏,李东旭,等.纳米材料改性水泥基材料的研究应用进展[J].硅酸盐通报,2016,35(7):2128-2134.WANG L G,ZHANG S P,LI D X,et al.Research progress in effect of nanomaterials on the performance of cement based materials[J].Bulletin of the Chinese Ceramic Society,2016,35(7):2128-2134.(in Chinese)
[16]GAO Y L,HE B,LI Y Y,et al.Effects of nanoparticles on improvement in wear resistance and drying shrinkage of road fly ash concrete[J].Construction and Building Materials,2017,151:228-235.
[17]LONG W J,XIAO B X,GU Y C,et al.Micro-and macro-scale characterization of nano-SiO2 reinforced alkali activated slag composites[J].Materials Characterization,2018,136:111-121.
[18]JALAL M,POULADKHAN A,HARANDI O F,et al.Comparative study on effects of Class F fly ash,nano silica and silica fume on properties of high performance self compacting concrete[J].Construction and Building Materials,2015,94:90-104.
[19]ZHANG P,DAI X B,GAO J X,et al.Effect of nanoSiO2 particles on fracture properties of concrete composite containing fly ash[J].Current Science,2015,108(11):2035-2043.
[20]李伟,朱浮声,王晓初,等.纳米混凝土的制备及其干缩性能研究[J].东北大学学报(自然科学版),2017,38(8):1173-1176,1194.LI W,ZHU F S,WANG X C,et al.Preparation and dry-shrinkage performance of nano-concrete[J].Journal of Northeastern University(Natural Science),2017,38(8):1173-1176,1194.(in Chinese)
[21]叶青,张泽南,孔德玉,等.掺纳米SiO2和掺硅粉高强混凝土性能的比较[J].建筑材料学报,2003,6(4):381-385.YE Q,ZHANG Z N,KONG D Y,et al.Comparison of properties of high strength concrete with nano-SiO2and silica fume added[J].Journal of Building Materials,2003,6(4):381-385.(in Chinese)
[22]王冲.特超强高性能混凝土的制备及其结构与性能研究[D].重庆:重庆大学,2005.WANG C.Research on preparation,structure and performance of ultra high strength high performance concrete[D].Chongqing:Chongqing University,2005.(in Chinese)