Effect of Cellulose Fiber on Humidity Control and Properties of Cement Mortar

Authors

LIANG Jinguo, CCCC Highway Con sultants Co .， Ltd.， Beijing 100088 ， ChinaFollow
MA Baofu, CCCC Highway Con sultants Co .， Ltd.， Beijing 100088 ， China

Abstract

To explore the effect of flax cell ulose fiber on the humidity and basic properties of cement mortar,this paper adopted flax cellulose fibers with different lengths (0.5 and 5 mm ) and mixing amounts (mass fraction of 0.5%,1%,1.5%,and 2% of cement ).Tests were conducted on rheological properties,mechanical properties,autogenous shrinkage properties,and internal relative humidity development of cement mortar.Setting time,compressive strength,shrinkage rate,and relative humidity were used to evaluate the performance improvement effect of cellulose fiber on cement mortar.The results show that the absorbance rate of flax fiber per unit mass of 0.5 mm is 3.45 times its weight,while the absorbance rate of flax fiber per unit mass of 5 mm is 6.03 times its weight.Flax fiber has significant advantages in humidity compensation,shrinkage inhibition,and crack retardation of cement-based materials.At each curing age,a higher mixing amount of fiber indicates lower compressive strength.Under the same mixing amount of fiber,the compressive strength of the short fiber group is higher than that of the long fiber group.Compared with the baseline mortar group,the short fiber has a more obvious inhibition effect on autogenous shrinkage.A higher mixing amount of flax fiber indicates more significant internal humidity compensation.In addition,under the same mixing amount of fiber,the humidity compensation effect of long fiber is better than that of short fiber,indicating that the water quantity of internal curing is the key to compensating for the internal humidity.

Publication Date

6-27-2024

DOI

10.14048/j.issn.1671-2579.2024.01.005

First Page

46

Last Page

52

Submission Date

February 2025

Recommended Citation

Jinguo, LIANG and Baofu, MA (2024) "Effect of Cellulose Fiber on Humidity Control and Properties of Cement Mortar," Journal of China & Foreign Highway: Vol. 44: Iss. 3, Article 5.
DOI: 10.14048/j.issn.1671-2579.2024.01.005
Available at: https://zwgl1980.csust.edu.cn/journal/vol44/iss3/5

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