纳米SiO2对水泥剪切强度及浆液流变性质影响的试验研究
Experimental Study on Effect of Nano-SiO2 on Shear Strength and Rheological Properties of Cement
-
摘要: 为了研究纳米SiO2对水泥剪切强度及流变性质的影响,针对水灰比1.0和3 d养护时间下的不同水泥试样开展了一系列不同法向应力条件下的直剪试验,研究了纳米SiO2颗粒对试样的剪切行为及剪切强度参数(剪切强度、黏聚力、内摩擦角)影响规律,以及减水剂对浆液流变性质的影响规律。结果表明:水泥结石体试样随着剪切位移的增大,剪切应力逐渐增大,直至达到峰值应力,之后表现为应变软化阶段;添加纳米SiO2后,结石体试件的黏聚力和内摩擦角分别提高了8.2 %和4.1 %。添加纳米SiO2的浆液黏度明显增加;通过添加1.5 %含量的减水剂,可以显著提高含纳米SiO2浆液的流动性,从而获得具有高流动性和渗透能力的浆液。Abstract: In order to study the effect of nano-SiO2 on shear strength and rheological properties of cement grout, a series of direct shear tests were conducted under multiple constant normal loads for cement grouted samples with water-cement ratio of 1.0 and 3-day curing time. Then, the influence of nano-SiO2 on shear behavior and shear strength parameters(τp, c and φ) of samples was studied, and the rheological properties of grouts after adding super plasticizer were further studied. The results showed that with the increase of shear displacement, the shear stress increased gradually until the peak stress was reached, and then it appeared as strain softening stage. After the addition of nano-SiO2, the cohesion and internal friction angle of the samples were increased by 8.2 % and 4.1 %, respectively. The viscosity of grouts containing nano-SiO2 increased significantly. By adding 1.5 % super plasticizer, the fluidity of the grouts containing nano-SiO2 could be significantly improved, so as to obtain the grouts with high fluidity and permeability.
-
Keywords:
- cement /
- direct shear test /
- shear strength /
- nano-SiO2 /
- water reducer /
- rheological property /
- grouting
-
-
[1] 刘泉声,卢超波,卢海峰,等.断层破碎带深部区域地表预注浆加固应用与分析[J].岩石力学与工程学报, 2013,32(S2):3688-3695. [2] 王家臣,王兆会.高强度开采工作面顶板动载冲击效应分析[J].岩石力学与工程学报,2015,34(S2):3987-3997. [3] 何满潮,钱七虎.深部岩体力学基础[M].北京:科学出版社,2010:13-15. [4] 郑卓,李术才,刘人太,等.注浆加固后岩体单一界面抗剪强度[J].岩石力学与工程学报,2016,35(S2):3915-3922. [5] 刘泉声,周越识,卢超波,等.含裂隙泥岩注浆前后力学特性试验研究[J].采矿与安全工程学报,2016,33(3):509-514. [6] 黄达,金华辉,黄润秋.拉剪应力状态下岩体裂隙扩展的断裂力学机制及物理模型试验[J].岩土力学,2011,32(4):997-1002. [7] 韩立军,宗义江,韩贵雷,等.岩石结构面注浆加固抗剪特性试验研究[J].岩土力学,2011,32(9):2570. [8] Lu Y L, Wang L G, Li Z L. et al. Experimental Study on the Shear Behavior of Regular Sandstone Joints Filled with Cement Grout[J]. Rock Mechanics and Rock Engineering, 2016, 50(5): 1321-1336. [9] Chen J H, Hagan P C, Saydam S. Shear behaviour of a cement grout tested in the direct shear test[J]. Construction and Building Materials, 2018, 166: 271-279. [10] Nasir O, Fall M. Shear behaviour of cemented pastefill-rock interfaces[J]. Engineering Geology, 2008, 101(3/4): 146-153. [11] 黄政宇,曹方良.纳米材料对超高性能混凝土性能的影响[J].材料导报,2012,26(9):136-141. [12] 仵鹏涛,刘中宪,吴成清,等.纳米材料对超高性能混凝土动态力学特性的影响实验研究[J].硅酸盐通报,2016,35(11):3546-3555. [13] 曹方良.纳米材料对超高性能混凝土强度的影响研究[D].长沙:湖南大学,2012:1-4. [14] 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. [15] 王梦华.纳米SiO2对掺防水剂水泥基材料性能的影响及作用机理研究[D].杭州:浙江大学,2015:25. [16] 徐迅,卢忠远.纳米二氧化硅对硅酸盐水泥水化硬化的影响[J].硅酸盐学报,2007,35(4):478-484. [17] 侯学彪,黄丹,王委.掺纳米SiO2高性能混凝土研究进展[J].混凝土,2013(3):5-9. [18] Arel HS, Shaikh F U A. Effects of fly ash fineness, nano silica, and curing types on mechanical and durability properties of fly ash mortars[J]. Structural Concrete, 2018, 19(2): 597-607. [19] Berra M, Carassiti F, Mangialardi T. et al. Effects of nanosilica addition on workability and compressive strength of Portland cement pastes[J]. Construction and Building Materials, 2012, 35: 666-675. [20] 王浩,逄建军,张力冉,等. 减水剂对水泥浆体流变参数影响的数学分析[J].硅酸盐通报,2014,33(5):1035-1039. [21] 郭东明,李妍妍,左志昊,等.低黏度超细水泥浆液配比试验研究[J].煤矿安全,2019,50(5):72-77. [22] Leemann A, Winnefeld F. The effect of viscosity modifying agents on mortar and concrete[J]. Cement and Concrete Composites, 2007, 29(5): 341-349. [23] 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. -
期刊类型引用(11)
1. 姜龙，刘波，马平海. 综掘工作面粉尘分级防治技术应用研究. 能源技术与管理. 2024(02): 61-63+102 . 
百度学术
2. 司俊鸿，王昊宇，霍小泉，岳东，袁增云，范智海. 综掘工作面半封闭式区域联合控尘技术研究. 金属矿山. 2024(05): 126-133 . 百度学术
3. 莫金明. 风流速度与喷雾角度对雾滴场分布特征的影响. 煤矿安全. 2024(08): 62-71 . 本站查看
4. 郭佳策. 烟煤润湿性能影响机理研究. 内蒙古煤炭经济. 2024(16): 1-3 . 百度学术
5. 王成，彦鹏，代振华，陆斌，葛少成，赵伟智. 微米活性液滴场致荷电效果及煤尘润湿性能研究. 煤矿安全. 2024(10): 46-52 . 本站查看
6. 彦鹏，王成，代振华，陆斌，葛少成，刘旭东. 磁-电耦合喷雾降尘效果研究. 煤矿安全. 2024(11): 92-100 . 本站查看
7. 常伟，王昊，辛创业，卢守青，刘状. 综掘工作面压风射流对呼吸性粉尘污染的影响规律研究. 煤矿安全. 2024(12): 115-122 . 本站查看
8. 娄剑. 综掘煤巷综合降尘技术研究. 矿业装备. 2024(12): 34-36 . 百度学术
9. 明洁. 综掘工作面长压短抽通风除尘技术探析. 当代化工研究. 2023(14): 114-116 . 百度学术
10. 司俊鸿，王昊宇，霍小泉，胡伟，袁增云，范智海. 综掘工作面气雾涡旋降尘技术研究及应用. 金属矿山. 2023(07): 135-141 . 百度学术
11. 徐丹丹，邱进伟. 磁化对表面活性剂性能影响及降尘效果研究. 煤炭工程. 2023(09): 134-139 . 百度学术
其他类型引用(1)
计量
- 文章访问数: 20
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 12
下载:
