Pengaruh Penggunaan Artificial Light Weight Aggregate (ALWA) berbahan Styrofoam terhadap Kuat Tekan Self Compacting Concrete (SCC)

Self Compacting Concrete (SCC) adalah beton segar yang mampu mengalir mengisi bekisting dengan sendirinya tanpa memerlukan alat penggetar. Salah satu penyebab kerusakan bangunan saat terjadi gempa bumi yaitu berat sendiri struktur. Agregat ringan merupakan salah satu cara untuk mereduksi berat stuktur, oleh karena itu self compacting concrete beragregat ALWA merupakan suatu solusi untuk mereduksi beban mati struktur dengan kemudahan pelaksanaan pengerjaan. Penelitian ini dilakukan untuk mengetahui seberapa besar kuat tekan, modulus elastisitas, kuat tarik belah dan kuat tarik lentur pada masing-masing variasi komposisi ALWA sebagai pengganti agregat kasar pada Beton Normal dan SCC. Proporsi ALWA yang disubstitusi ke dalam beton yaitu 0%, 15%, 50% dan 100%. Benda uji yang digunakan berbentuk silinder dengan ukuran tinggi 200 mm dan diameter 100 mm untuk pengujian kuat tekan, modulus elastisitas dan kuat tarik belah. Sedangkan benda uji berbentuk balok dengan ukuran 150 mm x 150 mm x 600 mm untuk pengujian kuat lentur. Hasil dari pengujian kuat tekan menunjukkan bahwa semakin tinggi variasi komposisi ALWA maka semakin rendah kuat tekan yang dihasilkan. Penambahan ALWA sebagai pengganti agregat kasar pada campuran beton normal dan SCC paling efektif terjadi pada kadar 15% ALWA dengan kuat tekan pada beton normal dan SCC yang dihasilkan sebesar 21.13 MPa dan 28.33 MPa. Sedangkan untuk nilai modulus elastisitas pada beton normal yaitu 20843.99 MPa dan modulus elastisitas SCC sebesar 23717.77 MPa. Kuat tarik belah beton normal adalah 2.23 MPa dan SCC adalah 2.32 MPa. Nilai modulus runtuh dari beton memadat sendiri (SCC) dengan kadar 15% ALWA yaitu sebesar 5.029 MPa. ========================================================================================================= Self Compacting Concrete (SCC) is a fresh concrete that can flow filling the formwork by itself without need the vibrator. One of the causes of damage to buildings during an earthquake is its own weight structure. Lightweight aggregate is one manner to reduce weight of the structure, therefore self compacting concrete with ALWA aggregate is a solution to reduce dead load structure with ease of processing. This research was conducted to find out how big compressive strength, modulus of elasticity, tensile strength and flexural strength in each variation of ALWA composition as a substitute of coarse aggregate on regular concrete and SCC. The proportion of ALWA substituted into the concrete is 0%, 15%, 50% and 100%. The test specimens used are cylindrical in size 200 mm and diameter 100 mm for testing of compressive strength, modulus of elasticity and tensile strength. While the specimens beam with the size of 150 mm x 150 mm x 600 mm for testing of flexural strength. The results of the compressive strength test show that the higher composition of ALWA the lower compressive strength. The addition of ALWA as a substitute of coarse aggregate to regular concrete and SCC most effective occurred at 15% ALWA with compressive strength on regular concrete and SCC is 21.13 MPa and 28.33 MPa. While the modulus of elasticity value in regular concrete is 20843.99 MPa and modulus of elasticity in SCC is 23717.77 MPa. The tensile strength of regular concrete is 2.23 MPa and SCC is 2.32 MPa. The modulus rupture of Self Compacting Concrete (SCC) with 15% ALWA is 5.029 MPa

Stress and Strain on Self-Compacting Concrete using ALWA as Coarse Aggregates Substitution

Concrete with lightweight aggregates is a type of concrete that is widely used in earthquake-prone areas. One of the building blocks for lightweight concrete utilizing waste is Styrofoam. Styrofoam in lightweight concrete began to be widely used in structural buildings. Self-compacting concrete is a type of concrete that can flow by itself without experiencing segregation. Light aggregate concrete is applied to self-compacting concrete in order to get benefits from an economic and construction time perspective, thereby saving costs and processing time. This study aimed to determine the ductility level of concrete seen from the magnitude of the stress and strain values at each ALWA content as a substitute for gravel in regular and self-compacting concrete. The loading of a concrete cylinder affects the relationship between stress and strain. Variations in the composition of ALWA substituted in concrete, from 0%, 15%, 50%, to 100%. The test was carried out as compressive strength with a cylindrical specimen with a height dimension of 200 mm and a diameter of 100 mm. The results of the test show that the strain values of 0.5f'c at SCC0, SCC15, SCC50, and SCC100 are 0.00140, 0.00140, 0.00146, 0.00151, the higher the ALWA substituted in the SCC mixture, the greater the strain value. In addition, the higher the amount of substituted ALWA in the SCC mixture, the lower the level of workability. This study shows that lightweight aggregate with Styrofoam can make concrete more ductile.ABSTRAKBeton dengan agregat ringan merupakan salah satu jenis beton yang banyak digunakan pada daerah rawan gempa. Bahan penyusun beton ringan dengan memanfaatkan limbah salah satunya berbahan Styrofoam. Penggunaan styrofoam pada beton ringan mulai banyak digunakan pada bangunan yang bersifat struktur. Beton memadat sendiri adalah jenis beton yang memiliki kemampuan untuk mengalir dengan sendirinya tanpa mengalami segregasi. Beton beragregat ringan diaplikasikan pada beton memadat sendiri agar mendapatkan manfaat dari segi ekonomi dan waktu pelaksanaan konstruksi, sehingga lebih menghemat biaya dan waktu pengerjaan. Tujuan penelitian ini untuk mengetahui tingkat daktilitas beton dilihat dari besarnya nilai tegangan dan regangan pada setiap kadar ALWA sebagai pengganti kerikil pada beton normal dan beton memadat sendiri. Pembebanan suatu silinder beton mempengaruhi hubungan antara tegangan dan regangan. Variasi komposisi ALWA yang disubstitusi pada beton yaitu dari 0%, 15%, 50% sampai 100%. Pengujian yang dilakukan berupa kuat tekan dengan benda uji berbentuk silinder dimensi tinggi 200 mm dan diameter 100 mm. Hasil dari pengujian menunjukkan nilai regangan 0.5f’c pada SCC0, SCC15, SCC50, SCC100 nilainya yaitu 0.00140, 0.00140, 0.00146, 0.00151, semakin tinggi ALWA yang disubstitusi dalam campuran SCC maka semakin besar nilai regangannya. Selain itu, semakin tinggi jumlah ALWA yang disubstitusi dalam campuran SCC maka semakin rendah tingkat workability. Penelitian ini menunjukkan penggunaan agregat ringan dengan styrofoam dapat menjadikan beton lebih daktail daripada sebelumnya

The Effect of Styrofoam Artificial Lightweight Aggregate (ALWA) on Compressive Strength of Self Compacting Concrete (SCC)

Self-compacting concrete (SCC) is a fresh concrete that is able to flow and fill up the formwork by itself without the need of a vibrator to compact it. One of the reasons that causes the damage of a building structure during an earthquake is the heavy weight of its structural members which are from the high density of the material used such concrete material. Lightweight aggregate is one of the solutions to reduce the weight of the structure. Therefore, the SCC using the artificial lightweight aggregate (ALWA) is one of the solutions to reduce the self-weight (dead load) of a structure. This research was conducted to investigate the impact of the use of ALWA in conventional concrete and SCC in terms of its compressive strength and modulus of elasticity. To study the impact of the use of ALWA in SCC, several variation of percentage of ALWA as a substitution to the natural coarse aggregate was examined. The proportions of ALWA as a replacement to the coarse aggregate were 0%, 15%, 50%, and 100%. The test specimens were the cylindrical concrete of 200 mm in height and 100 mm in diameter for both compressive strength and modulus of elasticity tests. The results of the compressive strength test indicated that the higher the percentage of ALWA used in SCC, the lower the compressive strength of the concrete. The addition of ALWA as a substitution to the natural coarse aggregate to conventional concrete and SCC was found optimum at 15% replacement with the compressive strength of conventional concrete and SCC of 21.13 and 28.33 MPa, respectively. Whereas, the modulus of elasticity of the conventional concrete and SCC were found to be 20,843.99 and 23,717.77 MPa, respectively