不同岩性石粉-水泥胶砂流动性和力学性能研究
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摘要
采用石灰岩、凝灰岩、花岗岩、玄武岩和石英岩石粉与基准水泥制备了石粉-水泥胶砂试件,研究了石粉岩性和掺量对水泥胶砂流动度、抗压强度和抗折强度的影响;采用同步热分析仪测定了石粉-水泥浆体的热重曲线,研究了石粉岩性对水泥水化程度的影响。结果表明:石灰岩石粉掺量不大于10%、石英岩石粉掺量不大于20%时,水泥胶砂流动度增大;掺加凝灰岩、玄武岩和花岗岩石粉,水泥胶砂流动度降低。石灰岩石粉和凝灰岩石粉对水泥胶砂强度贡献率大于花岗岩、玄武岩和石英岩石粉,石粉掺量不大于30%时,其活性指数分别可达68. 7%和72. 2%。掺石灰岩石粉的水泥浆体中,Ca(OH)_2含量高于掺其他岩性石粉的水泥浆体,石灰岩和凝灰岩石粉对水泥水化程度的贡献率大于花岗岩、玄武岩和石英岩石粉。
The limestone,tuff,granite,basalt and cobblestone powders were prepared to powder-cement mortars with reference cement. The effects of powder lithology and powder content on the fluidity,compressive strength and flexural strength of cement mortar were researched. The effects of powder lithology on the hydration degree of cement paste were researched through TG-DTA curves determined by simultaneous thermal analyzer. The results show that the limestone powder and quartzite powder enhance the fluidity of cement mortar when the contents are less than 10% and 20% respectively,and that the fluidity of cement mortar is increased because of adding tuff, granite or quartzite powder. The contribution rates of limestone powder and tuff powder to mortar strength are higher than granite,basalt and quartzite powder,and their activity indexes of mortars are 68. 7% and 72. 2%,respectively. The Ca( OH)_2 content of pastes with limestone is higher than the pastes with other powders,and the ability of limestone and tuff powder to promote the hydration degree of cement is higher than other powder.
The limestone,tuff,granite,basalt and cobblestone powders were prepared to powder-cement mortars with reference cement. The effects of powder lithology and powder content on the fluidity,compressive strength and flexural strength of cement mortar were researched. The effects of powder lithology on the hydration degree of cement paste were researched through TG-DTA curves determined by simultaneous thermal analyzer. The results show that the limestone powder and quartzite powder enhance the fluidity of cement mortar when the contents are less than 10% and 20% respectively,and that the fluidity of cement mortar is increased because of adding tuff, granite or quartzite powder. The contribution rates of limestone powder and tuff powder to mortar strength are higher than granite,basalt and quartzite powder,and their activity indexes of mortars are 68. 7% and 72. 2%,respectively. The Ca( OH)_2 content of pastes with limestone is higher than the pastes with other powders,and the ability of limestone and tuff powder to promote the hydration degree of cement is higher than other powder.
引文
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[20]潘晓燕,张广兴,张晏清,等.纳米SiO2改性水泥土钉注浆体性能的研究[J].建筑材料学报,2017,20(2):255-260.
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[3] Poitevin P. Limestone aggregate concrete,usefulness and durability[J]. Cement and Concrete Composites,1999,21(2):89-97.
[4]刘数华.石灰石粉对复合胶凝材料水化特性的影响[J].建筑材料学报,2010,13(2):218-221.
[5] Macphee D,Diamond S. Thaumasite in cementitious materials[J]. Cement and Concrete Composites,2003,25(8):805-807.
[6]宋少民,刘娟红,徐国强.石灰石粉在混凝土中应用的综述与研究[J].混凝土世界,2009(12):38-43.
[7] Li H,Huang F,Cheng G,et al. Effect of granite dust on mechanical and some durability properties of manufactured sand concrete[J].Construction and Building Materials,2016,109:41-46.
[8] Peng S,Li X,Wu Z,et al. Study of the key technologies of application of tuff powder concrete at the Daigo hydropower station in Tibet[J].Construction and Building Materials,2017,156:1-8.
[9] Xiong Z,Wang P,Wang Y. Hydration behaviors of portland cement with different lithologic stone powders[J]. International Journal of Concrete Structures and Materials,2015,9(1):55-60.
[10] Wang J,Yang Z,Liu Y. Effects of the lithologic character of manufactured sand on properties of concrete[J]. Journal of Wuhan University of Technology(Materials Science Edition),2014,29(6):1213-1218.
[11]王雨利,王稷良,周明凯,等.机制砂及石粉含量对混凝土抗冻性能的影响[J].建筑材料学报,2008,11(6):726-731.
[12]姚楚康.石粉特性对混凝土性能的影响研究[D].武汉:武汉理工大学,2014.
[13] Kwan A K H,Mckinley M. Packing density and filling effect of limestone fines[J]. Advances in Concrete Construction,2014,2(3):209-227.
[14]肖佳,王大富,何彦琪,等.石灰石粉细度对水泥浆体流变性能的影响[J].建筑材料学报,2017,20(4):501-505.
[15] Liu Z,Zhou M,Li B. Relationships between modified methylene blue value of microfines in manufactured sand and concrete properties[J].Journal of Wuhan University of Technology(Materials Science Edition),2016,31(3):574-581.
[16] Knop Y,Peled A,Cohen R. Influences of limestone particle size distributions and contents on blended cement properties[J]. Construction and Building Materials,2014,71(71):26-34.
[17] Kakali G,Tsivilis S,Aggeli E,et al. Hydration products of C3A,C3S and portland cement in the presence of CaCO3[J]. Cement and Concrete Research,2000,30(7):1073-1077.
[18] Wang Y,Ji X,Tang F,et al. Study on mechanical properties and durability of tuff stone powder concrete[C]. International Conference on Machinery,Materials and Computing Technology,2017.
[19]刘数华,方坤河.碾压混凝土抗裂性能评价[J].水力发电,2007,33(9):20-22.
[20]潘晓燕,张广兴,张晏清,等.纳米SiO2改性水泥土钉注浆体性能的研究[J].建筑材料学报,2017,20(2):255-260.