Early-age hydration and shrinkage of cement paste with coir fibers as studied by Nuclear Magnetic Resonance

被引：14
作者：
Zhang, XiaoXiao [1 ,2 ]
Ji, YanLiang [3 ]
Pel, Leo [1 ]
Sun, ZhenPing [3 ]
Smeulders, David [2 ]
机构：
[1] Eindhoven Univ Technol, Dept Appl Phys, Transport Permeable Media, POB 513, NL-5600 MB Eindhoven, Netherlands
[2] Eindhoven Univ Technol, Dept Mech Engn, Energy Technol, POB 513, NL-5600 MB Eindhoven, Netherlands
[3] Tongji Univ, Sch Mat Sci & Engn, Key Lab Adv Civil Engn Mat, Minist Educ, Shanghai 201804, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 336卷
关键词：
Coir fibers; Cement hydration; Pore size distribution; Shrinkage; NMR; PORTLAND-CEMENT; AUTOGENOUS SHRINKAGE; SUPERABSORBENT POLYMERS; MECHANICAL-PROPERTIES; WATER DISTRIBUTION; PLASTIC CRACKING; COCONUT FIBER; SILICA FUME; NMR; COMPOSITES;
D O I：
10.1016/j.conbuildmat.2022.127460
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Nuclear Magnetic Resonance (NMR) is used to study the early-age hydration as well as autogenous shrinkage and drying shrinkage of cement paste with the addition of coir fibers. The dosage and water content of coir fibers are evaluated. The results show that added coir fibers have a negligible influence on cement hydration kinetics. However, the internal curing effect of saturated coir fibers and water competition induced by dry fibers are visualized. As the saturated fiber content increases, autogenous shrinkage and drying shrinkage decrease due to the internal curing and reinforcing effects of fibers. Dry fibers generate more autogenous shrinkage but less drying shrinkage than saturated fibers of the same dosage due to the introduced water competition. NMR is proven able to track water transportation and shrinkage in cement composites.
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页数：10
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