One of the topics discussed during the training was concrete structure testing, presented by Dr.-Ing Josia Irwan Rastandi, S.T., M.T., an expert in the field. In his session, he emphasized the importance of concrete quality, which is often not achieved on-site, leading to buildings and structures having a shorter lifespan than expected.
Concrete quality failure can be caused by several factors, such as the selection of inadequate mixing materials, incorrect mix design, poor execution, and lack of proper curing. SNI 2847:2019 sets the acceptance criteria for concrete, including the compressive strength test of specimens taken at 28 days of age. Testing must be conducted by institutions that meet ASTM C1077 standards and in the field by qualified technicians. The frequency of testing should be done routinely, such as once a day or for every 110 m³ of concrete, with clear acceptance criteria. If test results show low compressive strength, further investigation is necessary, including concrete core tests to ensure structural safety, which must be performed following ASTM C42M standards.
“The test results from the laboratory and technicians must also be certified. When we begin to pour concrete, samples must be taken at least once every 110 m³ or once every 460 square meters,” said Dr.-Ing Josia Irwan Rastandi, S.T., M.T.
Mistakes in the concrete production process can lead to quality failure, including in material selection, mix design, and pouring techniques. Therefore, involving experts and certified institutions in every stage of concrete production and testing is crucial. By implementing proper practices and involving certified labour, concrete quality can be maintained, reducing the risk of failure and high repair costs in the future.
In a separate interview, the Dean of FTUI, Prof. Dr. Ir. Heri Hermansyah, S.T., M.Eng., IPU., said, “We hope that the results of this training will not only remain theoretical but can also be applied in everyday practice on-site. Through improved technical competence and understanding of the applicable standards, we can foster the creation of safer and more sustainable structures. We at the Faculty of Engineering, UI, are committed to continuing to collaborate with various institutions and stakeholders to improve the quality of education and practices in civil engineering and construction. We hope this training can be a first step toward achieving better infrastructure in Indonesia.”
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Public Communication Office
Faculty of Engineering, Universitas Indonesia
