ABSTRAK
Tujuan penelitian adalah, (1) mengetahui pengaruh abu sekam padi sebagai pengganti sebagian agregat halus dan variasi foam terhadap kuat tekan bata beton ringan foam, (2) mengetahui pengaruh abu sekam padi sebagai pengganti sebagian agregat halus dan variasi foam terhadap berat jenis bata beton ringan foam, (3) mengetahui pengaruh abu sekam padi sebagai pengganti sebagian agregat halus dan variasi foam terhadap daya serap air bata beton ringan foam,(4) mengetahui persentase abu sekam padi sebagai pengganti sebagian agregat halus dan variasi foam untuk mencapai kuat tekan yang memenuhi SNI No. 03 – 0349 – 1989, (5) mengetahui persentase abu sekam padi sebagai pengganti sebagian agregat halus dan varisi foam untuk mecapai berat jenis beton ringan yang memenuhi SNI No. 03 – 0349 – 1989, (6) mengetahui persentase abu sekam padi sebagai pengganti sebagian agregat halus dan variasi foam untuk mencapai daya serap air yang memenuhi SNI No. 03 – 0349 – 1989, (7) menghasilkan suplemen bahan ajar pada mata kuliah teknologi beton tentang pengaruh pemanfaatan abu sekam padi pada bata beton ringan foam terhadap kuat tekan, berat jenis, dan daya serap air bata beton ringan foam.
Penelitian ini menggunakan metode kuantitatif eksperimen dan teknik analisa data menggunakan analisis regresi berganda. Variabel yang mempengaruhi dalam penelitian adalah (1) variabel terikat: kuat tekan, berat jenis, dan daya serap air bata beton ringan foam, (2) variabel bebas: penggantian agregat halus dengan abu sekam padidenganvariasi 0%, 25%, 35%, dan 45% dan variasi foam 0,3 dan 0,2 dari volume beton.
Berdasarkan hasil penelitian disimpulkan bahwa, (1) variasiabu sekam padidan variasi foam berpengaruh kuat terhadap kuat tekan bata beton ringan foam,(2) variasi abu sekam padi dan variasi foam berpengaruh sangat kuat terhadap berat jenis bata beton ringan foam, (3) variasi abu sekam padi dan variasi foam berpengaruh sangat kuat terhadap daya serap air bata beton ringan foam, (4) tidak didapatkan prosentase abu sekam padi dan variasi foam untuk mencapai kuat tekan yang memenuhi SNI No. 03 – 0349 – 1989, (5) Semua persentase abu sekam padi dan variasi foam menghasilkan nilai berat jenis beton ringan yang memenuhi SNI No. 03 – 0349 – 1989, (6) Semua persentase abu sekam padi dan variasi foam menghasilkan nilai daya serap air yang memenuhi SNI No. 03 – 0349 - 1989(7) bahan ajar yang dihasilkan berupa suplemen bahan ajar tentang pengaruh pemanfaatan abu sekam padi sebagai pengganti sebagian agregat halus pada bata beton ringan foam terhadap kuat tekan, berat jenis, dan daya serap air.
Kata kunci: abu sekam, foam, bata beton ringan foam, kuat tekan, berat jenis, daya serap air
ABSTRACT
The purposes of this research were to, (1) determine the influence of  rice husk ash as smooth aggregate partial substitute and foam variation towards compressive strength of lightweight foam concrete brick, (2) determine the influence of  rice husk ash as smooth aggregate partial substitute and foam variation towards density of lightweight foam concrete brick, (3) determine the influence of  rice husk ash smooth aggregate partial substitute and foam variation towards absorption of lightweight foam concrete brick, (4) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve the compressive strength which fulfilledSNI No. 03 – 0349 – 1989, (5) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve thedensity lightweight concretewhich  fulfilled SNI No. 03 – 0349 – 1989, (6) determine the percentage of rice husk ash as smooth aggregate partial substitute and foam variation to achieve theabsorption which  fulfilled SNI No. 03 – 0349 – 1989, (7) produce course material supplement of concrete technology on the influence of using rice husk ash in lightweight foam concrete brick toward compressive strength, density, and absorption.
This research used experimental method and data analysis techniques used regression analysis. Variables in the study were (1) dependent variables: compressive strength, density, and absorption of lightweight foam concrete bricks, (2) independent variables: the substitute of smooth aggregate to rice husk ash withvariation 0%, 25%, 35%, and 45% and foamvariation0,2 and 0,3 of concrete volume.
Based on the results of the study concluded that, (1) variation of rice husk ash and foam was strongly influence towards the compressive strengthof lightweight foam concrete bricks, (2) variation of rice husk ash  and foam was strongly influence  towards the density of lightweight foam concrete bricks, (3) variation of rice husk ash and foam was very strongly influence towards the absorption of lightweight foam concrete bricks, (4) There was no percentage of rice husk ash and foam to achieve the compressive strengthof lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (5) All percentages of rice husk ash and foam variation produced the densityvalue of lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (6) All percentages of rice husk ash and foam variation produced the absorption value of lightweight foam concrete brick which fulfilled SNI No. 03 – 0349 – 1989, (7) the output course materials was a course materials supplement about the influence of the use rice husk ash as partly smooth agregate substitute of lightweight foam concrete brick to compressive strength, density, and absorption.
Keywords: rice husk ash, foam,lightweight foam concrete bricks, compressive strength, density, absorption.