Concrete damage on building is translated as a condition change from concrete quality. The damage that is referred to can be in the form of physical change or concrete quality downgrade on a building. This change can be caused by several reasons, such as implementation error, building overload, building function change, inadequate building maintenance, natural condition, and natural disaster. Concrete damage condition on buildings can be identified by performing a condition rating assessment. Condition rating assessment Is determined based on non-destructive examination. Assessment analysis results show the concrete structure condition and the action that must be done.

This research aims to make ultra high strength Reactive Powder Concrete (RPC) with marble powder as one of the components. The use of marble powder can increase Calcium Silicate Hydrate (CSH) and the strength of RPC. The research method used to achieve the objectives is experimental and divided into two steps. The first step is the characterization of a marble and micro silica powder mixture. Stoichiometry calculations are performed to determine the composition of the mixture. The test sample is made in the form of pellets consisting of a mixture of marble powder, micro silica, and water. The water content used is at 30% - 50%. Maintenance is carried out by immersion in water with the temperature of 20oC for 27 days and in steam at temperatures 200oC, 250oC, and 300oC with 2 atm pressure for 4 hours. Material characterization is carried out using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The second step in this research is the RPC compressive strength test. The test sample is made in the form of a cube measuring 50 x 50 x 50 mm. This cube is a mixture of water, cement, micro silica, marble powder, sand, and superplasticizer. Material composition is arranged based on the characterization of the sample pellet test, and maintenance of the sample cube test is carried out as in the sample pellet test.

Concrete quality degradation is a concrete quality downgrade from the perspective of concrete tension. Concrete quality degradation on concrete structure can happen either on new buildings (buildings that are still being constructed/in construction phase) or existing buildings (buildings that are already operational/in operational phase). The possible causes of concrete quality degradation on new buildings are, among others: incorrect implementation process such as readymix concrete quality that isn’t according to plan, lack of compacting, inadequate maintenance. Concrete quality degradation examination is done by examining concrete tension. On new buildings, one of the ways concrete tension can be identified is through test object examination. Concrete is a construction material that has a unique tension trait, where if it’s examined with a number of test objects, the value will spread around one particular average value. The value number depends on the field implementation perfection level. If the concrete tension of test object isn’t according to plan, installed concrete assessment with destructive and non destructive method can be performed. This research is done to identify the amount of concrete quality degradation on building structure based on tension value of concrete test object at the construction phase. Analysis results show the occurrence of a large concrete quality degradation, necessitating the determination of characteristics and categories until the worst possible concrete condition for concrete condition assessment needs.  AbstrakDegradasi mutu beton adalah penurunan kualitas beton dilihat dari kuat tekan beton. Degradasi mutu beton pada struktur beton dapat terjadi baik pada bangunan baru (bangunan yang sedang dibangun/tahap konstruksi) maupun bangunan existing (bangunan yang sudah beroperasi/tahap operasional). Penyebab degradasi mutu beton pada bangunan baru diantaranya ada bagian pada proses pelaksanaan yang kurang tepat seperti mutu beton readymix tidak sesuai rencana, kurangnya pemadatan, perawatan beton kurang baik. Pemeriksaan degradasi mutu beton dilakukan dengan memeriksa kuat tekan beton. Pada bangunan baru, kuat tekan beton dapat diketahui salah satunya melalui pengujian benda uji. Beton adalah suatu bahan konstruksi yang mempunyai sifat kekuatan tekan yang khas, yaitu apabila diperiksa dengan sejumlah besar benda uji, nilainya akan menyebar sekitar suatu nilai rata-rata tertentu. Besar atau kecil nilai bergantung pada tingkat kesempurnaan pelaksanaan di lapangan. Apabila kuat tekan beton dari benda uji tidak sesuai rencana maka dapat dilakukan pengujian beton terpasang dengan metode non destruktif dan destruktif.  Penelitian ini dilakukan untuk mengetahui besarnya degradasi mutu beton pada struktur bangunan gedung bertingkat berdasarkan nilai kekuatan tekan benda uji beton pada tahap konstruksi. Hasil analisis menunjukkan terjadi degradasi mutu beton yang besar, sehingga perlu ditetapkan karakteristik dan kategori sampai kondisi beton terburuk untuk kebutuhan penilaian kondisi beton.

Pembangunan bangunan gedung wajib dilaksanakan secara tertib administratif dan teknis untuk menjamin keandalan bangunan gedung tanpa menimbulkan dampak penting terhadap lingkungan. Keandalan bangunan gedung adalah kondisi keselamatan, kesehatan, kenyamanan, dan kemudahan yang memenuhi persyaratan teknis oleh kinerja bangunan gedung. Tingkat keandalan suatu bangunan dapat diketahui dengan melakukan penilaian terhadap kondisi struktur bangunan. Seiring berjalannya waktu, struktur bangunan dapat mengalami kerusakan dan menimbulkan risiko besar bagi pengguna bangunan. Untuk mengurangi risiko akibat kerusakan struktur maka perlu diketahui aspek-aspek yang dapat menyebabkan terjadinya kerusakan. Penilaian tingkat keandalan struktur beton dilakukan dengan menetapkan kriteria penilaian kerusakan beton pada bangunan gedung berdasarkan skala prioritas. Penilaian skala prioritas kriteria kerusakan pada struktur beton ditetapkan berdasarkan pendapat para ahli, sehingga penilaian bersifat deskriptif. Untuk mengantisipasi permasalahan tersebut maka penetapan skala prioritas dilakukan dengan pendekatan Fuzzy Logic untuk mewakili adanya ketidakpastian yang digabungkan dengan metode Analytic Hierarchy Process (AHP) sebagai alat pengambilan keputusan. Dalam  Hasil penelitian menunjukan kriteria, sub kriteria 1, dan sub kriteria 2 dengan skala prioritas tertinggi. Secara keseluruhan kriteria penilaian kerusakan beton dengan skala prioritas tertinggi adalah paparan dan korosi pada tulangan, penurunan tanah, dan dinding geser. Dapat diartikan pula bahwa kriteria dengan skala prioritas tertinggi merupakan aspek yang harus diperhatikan dalam perencanaan, pelaksanaan, dan pemeliharaan bangunan. Building construction must be executed in an orderly, administrative, and technical way to ensure the building’s reliability without causing any significant drawback to the environment. Building reliability is safety conditions, health, comfort, and ease that fulfill the technical terms from building performance. A building’s reliability rating can be identified by assessing the building structure condition. As time goes, building structure can experience damage and cause high risk for the building’s users. To reduce risk from structure damage, the aspects that can cause damage need to be identified. Concrete structure reliability rating assessment is done by determining concrete damage assessment criteria on building based on priority scale. Priority scale assessment on concrete structure is determined based on expert opinion, so the assessment is descriptive. To anticipate that problem, priority scale determination is done by using the Fuzzy Logic approach to represent uncertainty, which is combined with the Analytic Hierarchy Process (AHP) method as a decision making tool. In the research results are shown the criteria, sub criteria 1, and sub criteria 2 with high priority scale. As a wholethe concrete damage assessment criteria with the highest priority scale is exposure and corrosion on the reinforcement, land subsidence, and sliding wall. It can also be interpreted that the criteria with the highest priority scale are the aspects that have to be watched out for in building planning, implementation, and maintenance.

Building reliability is the ability of a building to carry out its functions according to plan. But in reality there are cases where buildings are not reliable. Therefore it is necessary to assess the reliability of the building in order to know the value of the reliability of a building so that it can be concluded whether the building is still functional or not. So a study was conducted on the assessment of the reliability of buildings that cover 5 aspects of the building, namely aspects of architecture, structure, utilities, accessibility, and building and environmental layout. The assessment will be carried out according to the existing function weights for the five aspects of the assessment. Evaluation is broadly carried out using visual observation methods and specifically for the aspect of utility the document study method is used as an additional. Can be known reliability in each aspect with the existing reliability classification. After evaluating each aspect, a comprehensive reliability assessment will be carried out with the weight of existing functions and can be known whether the building is reliable, less reliable, or unreliable through the existing reliability classifications and it can be seen whether the building is still in a worthy condition or not.