Analysis of physical characteristics and mechanism of retarder to stratified cemented backfill

被引:1
|
作者
Ai, Chunming [1 ,2 ]
Yu, Anju [1 ,2 ]
Liu, Chao [3 ]
Li, Tao [3 ]
机构
[1] Liaoning Tech Univ, Coll Safety Sci & Engn, Huludao 125000, Peoples R China
[2] Minist Educ, Key Lab Thermal Disaster & Prevent, Huludao 125000, Peoples R China
[3] Norin Min Ltd, 12A Guang Men Nan Jie, Beijing 100053, Peoples R China
来源
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
关键词
Stratified cemented backfill; Retarder; Physical characteristics; Mechanism; STRENGTH; SUPERPLASTICIZER; MODEL; FILL;
D O I
10.1038/s41598-024-64507-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The stratified structural plane caused by stratified backfill will reduce the strength of backfill, and the introduction of retarder will make up for the defect. Three retarders, sodium tripoly-phosphate, citric acid and sucrose, were introduced. After determining the optimal dosage of retarder, they were added into the filling slurry with a ratio of lime to sand of 1:6 and a mass concentration of 75%. Based on the hydration reaction mechanism and damage mechanics theory of cement, the setting time test and uniaxial compressive strength test were carried out. With the help of scanning electron microscopy and X-ray diffraction, the influence mechanism of retarder on the physical characteristics of stratified cemented filling was investigated.The main research contents and achievements are as follows:. The results showed that the three retarding agents can delay the setting time of the cement filling slurry, and the retarding effect is sucrose > citric acid > sodium tripolyphosphate. The addition of retarder can improve the uniaxial compressive strength and integrity of stratified consolidated backfill, and the best filling interval time (FIT) is 12 h. Appropriate addition of retarder will increase the amount of cement hydration products, make the structure of hydration products more dense, reduce the formation of stratified structural plane, and help to improve the strength of stratified cemented backfill.
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页数:10
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