Electronic Theses and Dissertation

Kuat Tarik Belah Beton Mutu Tinggi Menggunakan
Tanah Diatomae Sebagai Substitusi Semen dengan Penambahan Serat Polypropylene dan Serat Kaca

Imanatul Khaira
1704101010137
Program Studi Sarjana Teknik Sipil
Jurusan Teknik Sipil - Fakultas Teknik
Universitas Syiah Kuala

Abstrak

Beton mutu tinggi menjadi alternatif pembangunan infrastruktur. Kekuatan beton mutu tinggi memerlukan material penyusun beton yang berkualitas. Berdasarkan hasil penelitian Azzahra (2019) dan Rahman (2019), penambahan tanah diatomae sebagai substitusi semen dalam campuran beton dapat menghasilkan beton mutu tinggi. Beton memiliki kelebihan dalam memikul kuat tekan yang tinggi, namun beton lemah dalam menahan kuat tarik. Penambahan serat pada adukan beton menjadi salah satu alternatif untuk meningkatkan nilai kuat tarik belah pada beton. Tujuan dari penelitian ini untuk mengetahui pengaruh penambahan serat polypropylene dan serat kaca terhadap kuat tarik belah beton mutu tinggi dengan tanah diatomae sebagai substitusi semen. Adapun variasi persentase tanah diatomae yang digunakan adalah 0% dan 10% dari berat semen. Dalam penelitian ini digunakan variasi serat polypropylene dan serat kaca sebesar 0%, 0,2%, 0,4%, 0,6% dan 0,8% dari volume beton. Superplasticizer yang digunakan 1,5% serta w/c 0,3. Benda uji untuk kuat tarik belah berupa silinder dengan diameter 100 mm dan tinggi 200 mm. Pengujian dilakukan pada umur beton 28 hari. Berdasarkan hasil penelitian, nilai kuat tarik belah beton dengan substitusi tanah diatomae lebih rendah dibandingkan dengan kuat tarik belah tanpa substitusi tanah diatomae yaitu sebesar 7,41 MPa untuk beton tanpa substitusi tanah diatomae dan 5,44 MPa pada substitusi 10% tanah diatomae. Penambahan serat polypropylene dan serat kaca juga mempengaruhi nilai kuat tarik belah beton, dimana semakin tinggi penambahan serat maka kuat tarik belah beton juga semakin tinggi. Nilai kuat tarik belah beton tertinggi terdapat pada beton tanpa substitusi tanah diatomae dengan penambahan serat polypropylene dan serat kaca sebesar 0,8%. Penambahan 0,8% serat polypropylene didapatkan hasil sebesar 7,96 MPa sedangkan pada penambahan 0,8% serat kaca diperoleh hasil sebesar 7,81 MPa. Berdasarkan hasil yang didapatkan menunjukkan bahwa penambahan serat polypropylene dan serat kaca mempengaruhi kuat tarik belah beton mutu tinggi.


Kata kunci: Kuat tarik belah, beton mutu tinggi, serat polypropylene, serat kaca, tanah diatomae

Split Tensile Strength of High Performance Concrete Using Diatomaceous Earth as Cement Replacement with Addition of Polypropylene Fiber and Fiberglass Imanatul Khaira 1704101010137 Civil Engineering Department Civil Engineering Major - Engineering Faculty Syiah Kuala University Abstract High performance concrete becomes an alternative to infrastructure development. High performance concrete strength requires quality concrete building materials. Based on the results of Azzahra (2019) and Rahman (2019) research, the addition of diatomaceous earth as a cement substitution in concrete mixtures can produce high performance concrete. Concrete has advantages in shouldering high compressive strength, but concrete is weak in withstanding strong tensile. The addition of fiber to the concrete mortar becomes one of the alternatives to increase the strong value of pull on the concrete. The purpose of this research was to find out the effect of the addition of polypropylene fiber and glass fiber on the strong pull of high performance concrete with diatomaceous earth as cement substitution. The percentage variation in diatomaceous earth used is 0% and 10% of the weight of cement. In this research used variations of polypropylene fiber and fiberglass by 0%, 0.2%, 0.4%, 0.6% and 0.8% of concrete volume. Superplasticizers used 1.5% and w/c 0.3. The speciments for tensile strength in the form of cylindrical with a diameter of 100 mm and a height of 200 mm. Testing is carried out at 28 days of concrete age. Based on the results of the research, the tensile strength value of concrete with diatomaceous earth substitution is lower than the tensile strength without diatomaceous earth substitution which is 7.41 MPa for concrete without diatomaceous earth substitution and 5.44 MPa in substitution 10% diatomaceous earth. The addition of polypropylene fiber and glass fiber also affects the tensile strength value of concrete, where the higher the addition of fiber, the tensile strength concrete is also higher. The tensile strength concrete value is found in concrete without diatomaceous earth substitution with the addition of polypropylene fiber and fiberglass by 0.8%. The addition of 0.8% of polypropylene fiber was obtained a result of 7.96 MPa while in the addition of 0.8% of glass fiber obtained results in 7.81 MPa. Based on the results obtained showed that the addition of polypropylene fiber and fiberglass affects the tensile strength of high performance concrete. Keywords: Split tensile strength, high performance concrete, polypropylene fiber, fiberglass, diatomaceous earth