水泥-粘土复合粉混合砂浆早期强度研究

2021-11-02 07:38:55陈欢刘飞张健程阳何国顺王延磊
粘接 2021年10期

陈欢 刘飞 张健 程阳 何国顺 王延磊

摘 要:本文利用室内试验,对水泥-粘土复合粉混合砂浆早期强度进行研究,对不同龄期、掺量对水泥土强度影响进行分析,得到材料应力-应变全过程曲线,得到合适水泥土配比。通过分析试验结果表示,水泥土无侧限抗压强度在龄期不断增长过程中不断的增大,养护龄期为7~21d时候的无侧限抗压强度迅速增长。添加水泥能够对土体性能进行改善,并且在水泥掺量增长过程中增加。添加适量的粘土,此混合砂浆材料能够在注浆加固工程中使用。

关键词:水泥;粘土;砂浆;混合砂浆

中图分类号:TB33  文献标识码:A     文章编号:1001-5922(2021)10-0094-04

Study on Early Strength of Cement - clay Composite Powder Mixed Mortar

Chen Huan, Liu Fei, Zhang Jian, Cheng Yang, He Guoshun, Wang Yanlei

(School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China )

Abstract:In this paper, using the laboratory test, the early strength of cement-clay composite powder mixed mortar was studied, the influence of different ages and dosage on the strength of cement soil was analyzed, the stress-strain curve of the whole process of the material was obtained, and the appropriate cement soil ratio was obtained. According to the analysis of the test results, the unconfined compressive strength of cement soil increases continuously in the process of increasing age, and the unconfined compressive strength increases rapidly when the curing age is 7~21d. The addition of cement can improve the properties of soil and increase with the increase of cement content. Adding proper amount of clay, the slurry material can be used in the grouting reinforcement project.

Key words:cement ; clay ; mortar ; mixed mortar

水泥粘土混合砂漿的成本较低,并且具有良好的抗震性能,被广泛应用到堤防、垃圾填埋、矿山等工程中,很少在水利工程中使用,都认为砂浆结石的强度无法满足需求,国内外相关学者对此方面也进行了研究[1]。中国学者分析了粘土水泥固化浆材中固化剂含量、水泥掺量等因素,得到强度和水泥掺入比、龄期的关系曲线;国外学者利用实验得到在一定水灰比,水泥强度在水固比降低过程中增加。传统浆材结石强度指标都是通过自然养护得到的,组分材料的龄期、试验样本的尺寸会影响到强度指标,对于水泥土研究比较多,粘土水泥浆材强度研究成果比较少[2]。因此,本文对水泥粘土混合砂浆的强度进行分析。

1 影响水泥粘土混合砂浆强度的因素

在对水泥土加固进行研究中,国内外学者研究表示:第1种,水泥水化作用。……

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