Strength and Volume Stability of Controlled Low-Strength Material Based on Titanium Gypsum

Abstract

Abstract: A new type of cementless titanium gypsum-based controlled low-strength material (CLSM) was proposed to solve the problems of low comprehensive utilization and insufficient consumption of titanium gypsum and poor compaction in road projects. The unconfined compressive strength test method and volume stability test method were used to study the effects of construction waste soil replacement rate, water-solid ratio, titanium gypsum content and activator content on the compressive strength and volume stability of CLSM, and the reasons for the properties changes through XRD and SEM were explored. The results show that the early strength of CLSM increases with the increase of the replacement of construction waste soil, but the expansion rate decreases. Increasing the water-solid ratio reduces the strength, and the expansion rate increases accordingly. However, increasing the content of titanium gypsum reduces the strength and expansion rate of CLSM. When the content of titanium gypsum is 70% (mass fraction), the volume of CLSM tends to shrink, and the shrinkage rate basically reaches the maximum at 14 d. The increase of the amount of quicklime improves the shrinkage of CLSM and plays a certain role in compensating for shrinkage.

Key words: titanium gypsum, controlled low-strength material, construction waste soil, unconfined compressive strength, volume stability

CLC Number:

X705

ZHU Haoze, YU Fengquan, GENG Jian, WANG Xiangyang, QIN Huabin. Strength and Volume Stability of Controlled Low-Strength Material Based on Titanium Gypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3644-3653.

References

[1] 刘巧玲.钛石膏杂质分析及其建材资源化研究[D].重庆:重庆大学,2004.
LIU Q L. Study on analysis of impurities in titanium gypsum and titanium gypsum as building material[D]. Chongqing: Chongqing University, 2004 (in Chinese).
[2] 杨冬蕾.我国磷石膏和钛石膏资源化利用进展及展望[J].硫酸工业,2018(10):5-10.
YANG D L. Progress and prospect of resource utilization of phosphogypsum and titanium gypsum in China[J]. Sulphuric Acid Industry, 2018(10): 5-10 (in Chinese).
[3] GAZQUEZ M J, BOLIVAR J P, VACA F, et al. Evaluation of the use of TiO₂ industry red gypsum waste in cement production[J]. Cement and Concrete Composites, 2013, 37: 76-81.
[4] 肖世玉,吕淑珍,宁美,等.富铁钛石膏做水泥缓凝剂的试验研究[J].混凝土与水泥制品,2016(12):82-87.
XIAO S Y, LYU S Z, NING M, et al. Experimental research on cement retarder by titanium gypsum with iron in rich[J]. China Concrete and Cement Products, 2016(12): 82-87 (in Chinese).
[5] 刘妍,李国忠.不同激发剂对钛石膏-粉煤灰复合胶凝材料力学性能影响的研究[J].粉煤灰,2015,27(2):8-11.
LIU Y, LI G Z. Effect of different activators on mechanical performance of titanium gypsum-fly ash compound cementitious material[J]. Coal Ash, 2015, 27(2): 8-11 (in Chinese).
[6] American Concrete Institute. Controlled low-strength materials (CLSM)[R]. ACI 229R, 2013.
[7] LING T C, KALIYAVARADHAN S K, POON C S. Global perspective on application of controlled low-strength material (CLSM) for trench backfilling an overview[J]. Construction and Building Materials, 2018, 158: 535-548.
[8] 郝彤,王帅,冷发光.利用地铁盾构渣土制备高流态充填材料[J].硅酸盐通报,2020,39(5):1525-1532.
HAO T, WANG S, LENG F G. Preparation of high fluid filling materials by using subway shield muck[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(5): 1525-1532 (in Chinese).
[9] 保卫国,黄崇伟,王德荣.黏土填充型可控性低强度回填材料力学性能[J].解放军理工大学学报(自然科学版),2018(7):1-5.
BAO W G, HUANG C W, WANG D R. Mechanical properties for controlled low strength backfill material base on filled-type clay[J]. Journal of PLA University of Science and Technology (Natural Science Edition), 2018(7): 1-5 (in Chinese).
[10] 张雪松,俞然刚,陈金平,等.废弃输油管道充填用可控低强度材料性能研究[J].硅酸盐通报,2017,36(6):1823-1829+1840.
ZHANG X S, YU R G, CHEN J P, et al. Properties of controlled low-strength materials using in waste oil pipeline[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(6): 1823-1829+1840 (in Chinese).
[11] WANG L, ZOU F L, FANG X L, et al. A novel type of controlled low strength material derived from alum sludge and green materials[J]. Construction and Building Materials, 2018, 165: 792-800.
[12] 张宏,凌建明,钱劲松.可控性低强度材料(CLSM)研究进展[J].华东公路,2011(6):49-54.
ZHANG H, LING J M, QIAN J S. Research progress of controlled low strength materials (CLSM)[J]. East China Highway, 2011(6): 49-54 (in Chinese).
[13] 贾冬冬.低强度流动性建筑垃圾回填材料基本性能研究[D].北京:北京工业大学,2014.
JIA D D. Study on performance of low-strength flowable backfill materials made of construction waste[D]. Beijing: Beijing University of Technology, 2014 (in Chinese).
[14] Standard test method for flow consistency of controlled low strength material (CLSM): ASTM D6103—04[S]. ASTM International, West Conshohocken, PA, 2004.
[15] Standard test method for preparation and testing of controlled low strength material (CLSM) test cylinders: ASTM D4832—16[S]. ASTM International, West Conshohocken, PA, 2016.
[16] 中华人民共和国交通部.公路工程水泥及水泥混凝土试验规程:JTG E30—2005[S].北京:人民交通出版社,2005.
Ministry of Transport of People's Republic of China. Test method of cement and concrete for highway engineering: JTG E30—2005[S]. Beijing: China Communications Press, 2005 (in Chinese).
[17] 中华人民共和国建设部.建筑砂浆基本性能试验方法标准:JGJ/T 70—2009[S].北京:中国建筑工业出版社,2009.
Ministry of Construction of People's Republic of China. Standard for test method of basic properties of construction mortar: JGJ/T 70—2009[S]. Beijing: China Architecture and Building Press, 2009 (in Chinese).
[18] 刘顺妮,林宗寿,陈云波.改性石灰粘土固化剂的研究[J].矿物学报,1998,18(2):169-173.
LIU S N, LIN Z S, CHEN Y B. A study on soil stabilizer manufactured from modified lime[J]. Acta Mineralogica Sinica, 1998, 18(2): 169-173 (in Chinese).
[19] GHORAB H Y, KISHAR E A, ABOU ELFETOUH S H. Studies on the stability of the calcium sulfoaluminate hydrates. Part Ⅱ: effect of alite, lime, and monocarboaluminate hydrate[J]. Cement and Concrete Research, 1998, 28(1): 53-61.
[20] 郭印,徐日庆,邵允铖.淤泥质土的固化机理研究[J].浙江大学学报(工学版),2008,42(6):1071-1075.
GUO Y, XU R Q, SHAO Y C. Study on mechanism of muddy soil stabilization[J]. Journal of Zhejiang University (Engineering Science), 2008, 42(6): 1071-1075 (in Chinese).