iv

ABSTRAK

Penelitian mengenai sifat mekanik papan gipsum dengan penambahan serat sabut

kelapa telah dilakukan dengan cara penyusunan serat secara acak dengan panjang

serat antara 1 cm sampai 2 cm. Perbandingan persentase serat adalah 0,5%, 1,0%,

1,5%, terhadap massa tepung gipsum, dan perbandingan massa gipsum dengan air

adalah 2:1. Penambahan serat sabut kelapa tidak mempengaruhi nilai kuat lentur

bahan, dimana nilai rata-rata kuat lentur sekitar 6,9 N/mm2. Penambahan serat

sabut kelapa menyebabkan kuat tekan menurun. Dari 95,01 N/mm2 untuk

komposisi serat 0% menjadi 76,8 N/mm2

(komposisi 1%) dan 87 N/mm2

(komposisi 1,5%). Namun demikian penambahan serat sabut kelapa

mempengaruhi kuat tarik bahan secara signifikan. Kuat tarik sebesar 0,35 N/mm2

untuk komposisi 0% dan 1,03 N/mm2 untuk komposisi 1%. Pada komposisi serat

1,5%, diperoleh daya serapan air terendah 9,12% dan massa jenis tertinggi 1,4

gr/cm3.

Kata kunci : Sampel, gipsum, serat sabut kelapa, densitas, daya serap air, kuat

tekan, kuat lentur, kuat tarik

ABSTRACT

Research about mechanical characteristics of gypsum panel by mixing coconut

fiber was conducted using random oriented fiber by length of fiber between 1 and

2 cm. comparison of fiber percentage is 0.5%, 1%, and 1.5%, toward mass of

gypsum powder, and comparison of mass of gypsum and water is 2:1. Increasing

coconut fiber does not involve value of compress strength of the specimen, where

average value is around 6.9 N/mm2. Increasing coconut fiber causes decreasing of

compress strength. From 95.01 N/mm2 for fiber composition 0% becomes 78.8

N/mm2 (composition 1%) and 87 N/mm2 (composition 1.5%). However,

increasing coconut fiber significantly involves tensile strength in the amount of

0.35 N/mm2 for composition 0% and 1.03% N/mm2 for composition 1%. In the

fiber composition 1.5%, is obtained the lowest water infiltration 9.12% and the

highest density is 1.4 gr/cm3.

Keywords: gypsum, coconut fiber, density, water infiltration, compress strength,

bending strength, tensile strength