This research gives information about the practice of concreting work in Reinforced Concrete (RC) building project in Indonesia. The study area is Padang City, which has suffered severe damages due to September 2009 Earthquake. The target interviewee is 100 builders who are constructing RC buildings. This interview together with observation was conducted by directly visiting the construction sites. While collecting information about the main factors which contribute to RC building quality, e.g., concrete mixing, compaction, concrete placing and curing, the information about the profile of the builders have been collected. The results show that the workers dominate the profile of builders in productive age with 30 years experiences on average. However, 90% of the builders yet experience any construction workshop. The concreting work, which is conducted by the builders, yet reaches the required standard. More than 50% of the builders produced concrete with the higher water-cement ratio, and almost 65% admitted that they add more water after concrete`s setting time is finished. There are 3common methods of concrete compaction which is used. 6% of the builders use a vibrator, 43% use the rodding method, 28% use hummer, and 8% choose to add more water to placed concrete to increase concrete workability. Meanwhile, more than 60% of the builders do not cure the placed concrete. The results show that construction practice that is conducted by the local builders is needed to be improved. The mistakes seem to be repeated over a generation since the source of learning of the builders is mainly from their senior builder (77.25%) and self-learning (2.5%). Only 7.5% that admitted they had experienced on construction workshop.

Beton merupakan campuran agregat kasar dan halus, air serta semen atau bahan tambah lainnya. Dalam pelaksanaan pembuatan struktur beton masih banyak ditemukan permasalahan-permasalahan seperti pekerjaan yang tidak sesuai dengan mutu perencanaannya. Oleh karena itu perlu dilakukan pemeriksaan terhadap mutu beton apakah sudah sesuai dengan mutu yang direncanakan. Untuk mengetahui mutu beton dapat dilakukan dengan dua cara yaitu pengujian destruktif yang dilakukan dengan mesin uji tekan (Compression Testing Mechine) dan non destruktif dilakukan dengan hammer test. Tujuan dari penelitian ini untuk mendapat nilai factor pengali dari hasil uji hammer test sehingga diketahui  nilai kuat tekan aktual beton, selain untuk mengetahui perbandingan nilai kuat tekan hasil hammer test dan mesin tekan. Penelitian yang dilakukan menggunakan metode eksperimental dengan menggunakan 60 sampel kubus beton normal. Setelah dilakukan pengujian dapat disimpulkan bahwa terdapat perbedaan antara nilai kuat tekan kubus aktual dengan perkiraan kuat tekan hasil uji hammer test, dimana nilai kuat tekan aktual lebih besar 23,35% dibandingkan uji hammer test arah vertikal dan 37,68% pada arah horizontal. Faktor pengali kuat tekan aktual adalah 1,3 terhadap prediksi hammer test arah vertikal (900) dan 1,6 untuk arah horizontal (1800)

This research introduces ways of preparing the community to play a direct role in reducing the risk of earthquake and tsunami disasters. Nagari Matobe is a village located in South Sipora. This location is in an earthquake tsunami-prone area. The regional government has prepared Matobe village to be a disaster-resilient village. A previous survey from 2019-2020 showed that the community of Matobe village lacked knowledge of earthquakes, tsunamis, and disaster mitigation systems. This research aimed to improve preparation for earthquake and tsunami disasters by making the people of Matobe village resilient to disasters. The steps taken to improve community preparedness were: 1. An initial survey on community conditions, buildings, soil characteristics, and the community’s preparedness to face earthquakes and tsunamis; 2. The creation of a topographic map; 3. Education and training for elementary school students, with simulations, on the mechanism of earthquakes and tsunamis, on how to evacuate and prepare for evacuation, through stories using Doraemon, Nobita, and Dorami, comic characters from Japan; 4. Providing education and training on building materials under the 2002 Indonesian building planning standards and plans for earthquake-safe buildings following the 2016 earthquake-safe building structure standards; 5. Education and training to strengthen existing buildings; and 6. A proposal for a tsunami evacuation map and the location of evacuation signs. The community in Nagari Matobe was very cooperative and took an active role during the implementation of this research. The evaluation questionnaire distributed to elementary school students showed that the students were delighted and, on average, thought that the education and training in preparedness were beneficial. This education and training became an important reference for the community and government in developing Matobe village to become a disaster-resilient village.