CD Skripsi

Perubahan Sifat Mekanis Bata Ringan Clc Akibat Substitusi Abu Terbang (Fly Ash) Terhadap Semen

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ABSTRACT
The progress of building construction includes the construction of tall buildings that
require a relatively light self-weight structure to reduce the load that will be held by the
foundation. To reduce the structure's own weight, several innovations were carried out
including the use of lightweight bricks on the walls, as well as building floor panels.
Lightweight bricks are made from a mixture of cement, sand, water, and foaming agent.
To increase strength and improve its mechanical properties, lightweight bricks can be
made by adding a mixture of additives, including by using waste such as fly ash. Fly ash
is a coal combustion waste that has a finer grain than portland cement. The purpose of
this study was to analyze the optimum percentage of fly ash mixture to obtain lightweight
bricks with maximum compressive strength, then compare mechanical properties such as
compressive strength, displacement, and modulus of elasticity of lightweight bricks
without fly ash with lightweight bricks using a mixture of fly ash. This study used a cubeshaped
trial sample with a side length of 10 cm. Variations in the substitution of fly ash to
the trial sample were 0% (FA0), 5% (FA5), 10% (FA10), 15% (FA15), and 20% (FA20)
of the cement weight. The trial sample serves to determine the percentage of optimum fly
ash substitution which is used as a reference for making prototype samples. The
prototype sample measures 60 cm long, 10 cm wide, and 20 cm high. The compressive
strength of trial samples and prototype samples were tested at 3, 7, 14, and 28 days of
age using a compression load cell. When the prototype sample was 28 days old, the
shortening (displacement) value was read using a Linear Velocity Displacement
Transducer (LVDT) which was installed in the middle of the span of the lightweight brick
prototype sample. The compressive strength and displacement values are used in the
calculation of the elastic modulus. The results of this study obtained the optimum
compressive strength value of the trial sample, namely the FA15 variation of 1.64 MPa.
After obtaining the optimum compressive strength results, a prototype sample of FA0 and
FA15 variations were made with a compressive strength value of 1.006 MPa and 1.048
MPa. The displacement value in the prototype sample decreased by 25,21% due to the
substitution of fly ash by 15% of the cement weight. The modulus elasticity of FA0
variation is 28,846 MPa and the FA15 variation is 40,455 MPa. The conclusion of this
study is that the substitution of fly ash by 15% of the weight of cement resulted in
lightweight bricks being better able to withstand the displacement that occurred due to
the given load, and increasing the modulus of elasticity by 40.24%. It is suggested that
further research is related to more significant variations to maximize the yield of fly ash
substitution on lightweight bricks.
Keywords: Compressive strength, displacement, fly ash, lightweight brick, modulus of
elasticity.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

07 01. 122 (0037)

Penerbit

Pekanbaru : Universitas Riau –Fakultas Teknik – Teknik Sipil., 2022

Deskripsi Fisik

xii, 29 hlm.; ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

07 01. 122 (0037)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

Daus

Versi lain/terkait

Lampiran Berkas

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