Modulus Of Rupture Properties Research Articles

PENGARUH ASAM STEARAT TERHADAP SIFAT KETEGUHAN PATAH/MODULUS OF RUPTURE PAPAN PARTIKEL TERMOPLASTIK BEKAS BERPENGISI TEMPURUNG KELAPA

The utilization of former thermoplastic and coconut shell as particle board is one way to reduce plastic waste packaging, the ratio of the former as a thermoplastic matrix and coconut shells as fillers 60:40. Purpose of this study was to determine the effect of stearic acid on properties of modulus of rupture former thermoplastic particle board filler of coconut shell. Method of shell particle board manufacturing using the extruder, starting with the modification of coconut shell particles (size 80 mesh) with stearic acid (0 g, 3 g, 6 g and 9 g in 60 ml of ethanol ) and then dried in an oven at a temperature 70oC . Matrix and coconut shell ( 60:40 ) mixed in the extruder and then printed with hot press at a temperature of 170oC, until forming particle board with a size of 200 mm x 200 mm x 10 mm. Particle board analyzed the modulus of rupture in accordance with SNI 03-2105-2006. The results showed an increase in modulus of rupture properties. The modulus of rupture is 37.402 MPa greatest.

1 Year Long Term on Strength Properties of Pozzolanics Local Soil Bricks

This work emphasizes on the study of Pozzolanics Local Soil Brick properties. The compressive strength and flexural strength on modulus of rupture properties are investigated. At the ratio of 5% Portland cement type 1 and 30% fly ashes by weight at water powder ratio (w/p) 0.3525. This brick is called as Pozzolanics soil bricks. Their properties are compared to soil cement bricks (RCM35) at the age of 3, 7, 14, 28, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360. Results show that the compressive strength and flexural strength increase with increasing curing time. The compressive strength and the flexural strength at 360 day curing times increases as 41.83% and 43.77%, respectively compared at 28 day curing times. Similar to soil cement bricks, the compressive strength and flexural strength of Pozzolanics soil bricks increase as 20.80% and 11.94% respectively compared between 360 day and 28 day curing times. However, comparing to RCM35 at 360 days the compressive strength and the flexural strength are lower as 60.43% and 4.90 times respectively.

Use of wood from Pinus caribaea var. caribaea and Pinus caribaea var. bahamensis for production of particleboard panels

This study aimed to evaluate the quality of particleboard panels made with wood from Pinus caribaea var. caribaea and Pinus caribaea var. bahamensis, as obtained from forest stands. Experimental panels were produced with a nominal density of 0.70 g/cm³, using urea-formaldehyde resin and wood particles of Pinus caribaea var. caribaea and Pinus caribaea var. bahamensis, at rates of 100%x0%, 75%x25%, 50%x50%, 25%x75% and 0%x100%. Pinus taeda wood was used as control sample. Panels were compressed at a specific pressure of 40 kgf/cm² and temperature of 160ºC, for 8 minutes. Analysis results of water absorption, thickness swell, internal bond, modulus of elasticity and modulus of rupture properties indicated feasibility of using wood from Pinus caribaea var. caribaea and Pinus caribaea var. bahamensis for production of particleboard panels, individually or combined at rates of 75%, 50% and 25%.