Experimental Evaluation of Three Different Humidity Conditions to Physical and Mechanical Properties of Three Different Mixtures of Unfired Soil Bricks

Authors

Heru Purnomo, Civil Engineering Department, Universitas Indonesia, Depok 16424, IndonesiaFollow
Srikandi Wahyu Arini, Civil Engineering Department, Universitas Indonesia, Depok 16424, Indonesia

Abstract

Unfired brick is considered as a more environmentally friendly material than fired brick. It has lower mechanical properties than that of fired brick where humidity influences both bricks. Physical and mechanical properties of unfired bricks made of three kinds of mixtures were studied experimentally under three humidity conditions. The first kind of unfired brick was made only with soil and water while the second type was made of a mixture of soil, water and lime, and the third type was a mixture of soil, water, lime and uniform treated coir where 4% of lime mass was substituted with coir mass. Physical properties evaluation consisted of water content, absorption, volume shrinkage and density of those unfired bricks. Some variations occur in the third type of unfired bricks physical test results, where in general in more humid conditions there are tendency to have higher density, higher absorption, higher water content and less volume shrinkage compared to two other types of unfired bricks. Mechanical properties are evaluated by its modulus of rupture, compressive strength and modulus of elasticity. It is found that the addition of 4% treated 2.5 cm coir gives better mechanical properties in humid conditions compared to others types of unfired bricks.

Bahasa Abstract

Evaluasi Eksperimental Tiga Kondisi Kelembaban terhadap Properti Fisik dan Mekanik Tiga Campuran Bata Tidak Dibakar. Bata tidak dibakar dianggap lebih ramah lingkungan dibanding bata dibakar. Bata tidak dibakar memiliki properti mekanik yang lebih rendah daripada bata dibakar, dimana kelembaban berpengaruh pada keduanya. Properti fisik dan mekanik bata tidak dibakar yang dibuat dari tiga macam campuran dipelajari secara eksperimental terhadap tiga kondisi kelembaban. Tipe pertama dari bata tidak dibakar dibuat hanya dengan tanah dan air, sedangkan tipe kedua terbuat dari campuran tanah, air dan kapur; dan tipe ketiga terbuat dari campuran tanah, air, kapur dan serabut kelapa seragam yang sudah mendapat perlakuan sebelumnya dimana 4% dari massa kapur diganti dengan massa serabut kelapa. Evaluasi properti fisik terdiri dari kadar air, absorbsi, susut volume dan densitas bata tidak dibakar tersebut. Beberapa variasi muncul pada hasil tes fisik tipe bata ketiga, dimana secara umum pada kondisi lebih lembab terdapat kecenderungan untuk memiliki densitas lebih tinggi, absorbsi lebih tinggi, kadar air tinggi dan susut volume lebih kecil dibandingkan terhadap kedua jenis lainnya bata tidak dibakar. Properti mekanik dievaluasi oleh modulus keruntuhan, kuat tekan dan modulus elastisitasnya. Diketemukan bahwa penambahan 4% serabut memberikan properti mekanik yang lebih baik pada kondisi lembab dibandingkan tipe bata tidak dibakar lainnya.

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Recommended Citation

Purnomo, Heru and Arini, Srikandi Wahyu (2019) "Experimental Evaluation of Three Different Humidity Conditions to Physical and Mechanical Properties of Three Different Mixtures of Unfired Soil Bricks," Makara Journal of Technology: Vol. 23: Iss. 2, Article 7.
DOI: 10.7454/mst.v23i2.3583
Available at: https://scholarhub.ui.ac.id/mjt/vol23/iss2/7