Effects of poly(vinyl alcohol) on fiber cement interfaces. Part I: Bond stress-slip response
✍ Scribed by H. Najm; A.E. Naaman; T-J. Chu; R.E. Robertson
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 951 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1065-7355
No coin nor oath required. For personal study only.
✦ Synopsis
The addition of polymers to a cement matrix can add adding poly(vinyl alcohol) (PVA) to a cement based matrix to ira-significantly to the magnitude of the "adhesion" comprove the bond at the fiber-matrix interface. Two types of fibers were ponent of bond at the fiber-matrix interface. For examused, steel and brass fibers (simulating brass-coated steel fibers) in ple, Wei et al. [7,8] found that the pull-out force of a a series of pull-out tests where the load versus global slip up to fiber was almost quadrupled by adding 15% by weight complete pull-out was recorded. The measured slip was that at the of cement of a water-dispersion of acrylic polymer parsection where the fiber penetrates the matrix. The first article de-ticles. This improvement was suggested to arise from scribes the mechanical effects of the addition of PVA, while the the small size (50 to 100 nm) of the acrylic polymer second article presents the microscopic observations. Correlation be-particles which, being smaller than the cement partitween the two studies is pointed out in the second part and conclu-cles, are able to fill in the porous zone that typically sions are drawn. In particular, it is observed that the addition of surrounds the fibers. In the work described here, a PVA in the amount of 1.4% by weight of cement matrix leads to a water-soluble polymer, poly(vinyl alcohol) (PVA), was significant improvement in the bond strength as well as in the