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Lâm nghiệp

Vũ Huy Đại(1), Nguyễn Xuân Hiên

Nghiên cứu ảnh hưởng của tỷ lệ chất trợ đóng rắn đến tính chất cơ lý của ván compozit dăm gỗ - xi măng từ gỗ keo tai tượng

Research on the effect of accelerator to the physical and mechanical properties of Acada mangium wood - cement composite

Nông nghiệp & Phát triển nông thôn

2013

18

91-95

1859-4581

The effects of accelerator CaCl2 with 1 percent, 2 percent, 3 percent, 4 percent, 5 percent comparing to cement weight in Acacia mangium wood particle - cement mixture to some main physical and mechanical properties of this composite board including density, water absorption, thickness swelling, bending strength and its modulus of elasticity, internal bond were investigated. The results show that the amount of CaCl2 dramatically affects these properties of cement composite board. When this CaCl2 amount increase from 1 percent to 5 percent, the water absorption decrease from 35.62 percent to 18.925 percent; thickness swelling decrease from 3.46 percent to 1.28 percent; density change slightly from 0.95 to 1.109 g/cm3. When the CaCl2 amount increase from 1 percent to 3 percent, bending strength increase from 2.42 MPa to 3.09 MPa, then decrease to 2.76 MPa when this amount increase to 45 percent. The internal bond of cement board increase from 0.1691 MPa to 0.452 MPa with the increase of CaCl2 amount from 1 percent to 5 percent. The suitable amount of CaCl2 for making cement composite board from Acacia mangium should be 3 percent.

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