Abstract
To provide a cement reinforced with short fibers, which is improved in shear break resistance while taking advantage of excellent deformation ability of ECC.
A cement composition X containing 1.0-3.0 vol.% of PVA short fibers having a fiber diameter of 30-50 µm, and a fiber length of 5-20 mm, and having properties described in the following [A] wherein the water-cement ratio is not less than 30% and the sand-cement ratio is 0-100% is mixed with a coarse aggregate Y to make a kneaded material having a content of the coarse aggregate Y of 5-15 vol.% in the whole kneaded material. The kneaded material is placed as a cement composite material. [A] A hardened body of a kneaded material obtained by kneading the cement composition X (not containing the coarse aggregate Y) to disperse the PVA short fibers randomly in the three-dimensional direction behaves to show not less than 1% of a tensile strain in the tensile test, the hardened body having a material age of 28 days by standard under water curing.
A cement composition X containing 1.0-3.0 vol.% of PVA short fibers having a fiber diameter of 30-50 µm, and a fiber length of 5-20 mm, and having properties described in the following [A] wherein the water-cement ratio is not less than 30% and the sand-cement ratio is 0-100% is mixed with a coarse aggregate Y to make a kneaded material having a content of the coarse aggregate Y of 5-15 vol.% in the whole kneaded material. The kneaded material is placed as a cement composite material. [A] A hardened body of a kneaded material obtained by kneading the cement composition X (not containing the coarse aggregate Y) to disperse the PVA short fibers randomly in the three-dimensional direction behaves to show not less than 1% of a tensile strain in the tensile test, the hardened body having a material age of 28 days by standard under water curing.
| Original language | English |
|---|---|
| Patent number | JP2011121832 (A) |
| IPC | C04B28/02; C04B16/06; E01D1/00 |
| Publication status | Published - 23 Jun 2011 |