Bamboo has high tensile strength, so it can be an alternative to substitute wood or steel. Bamboo is a material that comes from nature, so it is vulnerable to degraded by weather changes and infected by termites and fungi. The effort to overcome this problem is by preserving before using it. This study aims to determine the tensile strength test results of bamboo after preserving and then compare with the tensile strength test results of bamboo without preserving. The research method was carried out by preserving bamboo by soaking the test sample in a container filled with water for a duration of time; 1 x 24 hours; 3 x 24 hours and 14 x 24 hours. The water used in freshwater with a salinity of 0 0/00 measured using a salinometer. The results showed that the tensile strength of bamboo increased compared without preserved with a percentage of 12.50%; 23.12% and 10.59% for the duration of time respectively 1x24 hours; 3x24 hours and 14x24 hours. Optimal tensile strength is obtained at a time duration of 3 x 24 hours and decreases at a longer time duration of 14x24 hours.

Bamboo is a natural material that can replace wood, but the bamboo weakness is easily attacked by powder beetle and a bad connection system. a simple method of bamboo connection system often uses fibbers, ropes or rattan. However, this method cannot guarantee the unity of structural elements, over time the bonds will become saggy because the shrinkage that is affected by temperature changes. Another alternative can be done by using the bolt or the Cendani bamboo (Bambusa multiplex) as shear connector. The purpose of research is to know the ability of the bolt and the Cendani bamboo the shear connector in an element structures of bamboo. The research method is done by combining three pieces of bamboo with mortar filler using the bolt and Cendani bamboo as a shear connector, then apply the load to the ultimate limit. The result showed that use of bolt as the shear connector was stronger than Cendani bamboo. This is available with the results of the higher tensile strength of the bolt compared by the tensile strength of Cendani bamboo.

Keberadaan industri pengolahan tepung ikan yang beroperasi di bantaran Sungai Kalimireng, Kecamatan Manyar, Kabupaten Gresik dimungkinkan dapat menimbulkan permasalahan lingkungan akibat resiko pencemaran limbah cair pengolahan tepung ikan. Penelitian ini bertujuan menganalisis kualitas Sungai Kalimireng di

This paper presents the results of an experimental study on Autoclaved Aerated Concrete (AAC) containing Sidoarjo Mud (Lusi) mud to utilize the mud.  Autoclaved aerated concrete (AAC) made from fine Artificial Lightweight Aggregate from Lusi mud and Fly Ash as a filler, sintered Lusi mud as the binder, aluminium powder as the foaming agent. Autoclaving process was conducted at 14 bars for 6 hours. AAC prepared in 3 (three) compositions, based on the variation of filler. The filler used in the research were sands (M-sand), fine ALWA made from Lusi mud (M-0), and fine ALWA made from Lusi mud mixed by fly ash (M-50). The workability of AAC investigated in this research was compressive strength of the AAC after 14 days, density, and X-Ray Diffraction. Experimental data showing that the compressive strength of AAC depends on the filler that is used, AAC classified at AAC-3 and AAC-4. The density of all the AAC can’t be classified as lightweight concrete. Experiment data showed the density occurs at 1148,0 kg/m3 to 1206,4 kg/m3. Chemical compounds of AAC with fine ALWA filler consisted of quartz, hematite, tobermorite, calcite, anorthite, magnetite, lime, and forsterite.