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Abstrak :
Tesis ini membahas mengenai pengaruh fasies dan diagenesis terhadap kualitas batugamping untuk bahan baku semen portland. Fasies dan diagenesis batugamping diketahui dengan analisis petrografi berdasarkan komposisi batugamping. Penentuan kualitas batugamping diketahui dengan analisis XRF (X-ray Fluorescence) untuk mengetahui kandungan senyawa CaO. Korelasi dilakukan setelah fasies dan diagenesis serta kualitas batugamping diketahui. Fasies batugamping kristalin memiliki kadar CaO lebih tinggi karena tersusun dari mineral kalsit dan minim pengotor. Lalu fasies wackestone yang memiliki kandungan CaO lebih rendah diakibatkan oleh dominasi mud supported pada fasies ini. Diagenesis batugamping berada pada Zona Marine Phreatic, Zona Burial, dan Zona Meteoric Phreatic. Hal ini diketahui dari tipe diagenesis yang ditemukan berupa sementasi, dll. Tipe diagenesis disolusi dan neomorfisme diduga mempengaruhi kualitas dari batugamping untuk bahan baku semen portland. Menggunakan acuan kualitas batugamping dari PT. Semen Padang bahwa kualitas batugamping daerah penelitian sudah memenuhi kriteria karena kandungan senyawa CaO rata-rata yaitu 52%. ......This thesis discusses the effect of facies and diagenesis on the quality of limestone as raw material for portland cement. Limestone facies and diagenesis are known by petrographic analysis based on limestone composition. Determination of the quality of limestone is known by XRF (X-ray Fluorescence) analysis to determine the content of CaO compounds. Correlation was carried out after the facies and diagenesis as well as the quality of the limestone were known. The crystalline limestone facies has a higher CaO content because it is composed of the mineral calcite and has minimal impurities. Then the wackestone facies which has a lower CaO content is caused by the dominance of mud supported in this facies. Limestone diagenesis is in the Marine Phreatic Zone, Burial Zone, and Meteoric Phreatic Zone. This is known from the type of diagenesis found in the form of cementation, etc. The type of dissolution diagenesis and neomorphism is thought to affect the quality of limestone as raw material for portland cement. Using limestone quality reference from PT. Semen Padang that the quality of the limestone in the study area met the criteria because the average content of the CaO compound was 52%.

Abstrak :
Dampak lingkungan yang ditimbulkan oleh sektor konstruksi mulai pengoptimalan pemakaian material daur ulang, seperti penggunaan Ground Granulated Blast Furnace Slag (GGBFS). Penggunaannya pada mortar atau beton dalam kadar tertentu dapat menyerupai bahkan melebihi kekuatan dan ketahanan mortar atau beton yang menggunakan ordinary portland cement (OPC). Penggunaan GGBFS sebenarnya juga kerap digunakan sebagai pencampur tambahan pada semen portland, sehingga menghasilkan material komposit yang dinamakan Portland Composite Cement (PCC) yang sekarang ini sudah cukup pasaran. Di sisi lain, penggunaan serat sebagai material konstruksi juga menjadi salah satu alternatif untuk mengurangi penggunaan material, karena mampu meningkatkan kekuatan mekanis, terutama pada kuat tarik dan lentur. Pada penelitian ini dilakukan substitusi semen portland biasa (OPC) dengan PCC sebesar 100% dan GGBFS sebesar 50% pada mortar yang mengandung serat abaka dan serat rami. Variasi dilakukan uji mekanis seperti uji kuat tekan, uji kuat tarik belah, dan uji kuat lentur, serta uji fisis seperti uji permeabilitas, uji susut, dan uji absorpsi air. Hasil menunjukkan bahwa substitusi GGBFS dapat menghasilkan sifat mekanis dan fisis yang serupa dengan mortar yang hanya menggunakan semen OPC. Penambahan serat juga berdampak baik bagi sifat mekanis mortar, terutama pada kuat lenturnya. ......The environmental impact caused by the construction sector has started to trigger the usage optimalization of recycled materials, such as the use of Ground Granulated Blast Furnace Slag (GGBFS). Its use in mortar or concrete in a certain way can resemble and even exceed the strength and durability of mortar or concrete using ordinary portland cement (OPC). The use of GGBFS is actually also often used as an additional mixer for portland cement, resulting in a composite material called Portland Composite Cement (PCC) which is currently quite on the market. On the other hand, the use of fiber as a construction material is also an alternative to reduce the use of materials, because it can increase the mechanical strength of mortar or concrete, especially in tensile and flexural strength. In this study, the substitution of ordinary portland cement (OPC) with 100% PCC and 50% GGBFS was carried out in a mortar containing abaca fiber and ramie fiber. Variations were carried out to mechanical tests such as compressive strength tests, split tensile strength tests, and flexural strength tests, as well as physical properties such as permeability tests, shrinkage tests, and water absorption tests. The results show that the GGBFS substitution can match the mechanical and physical properties of mortar using OPC. The addition of fibers also has a good impact on the mechanical properties of mortar, especially on its flexural strength.