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HERU PURNOMO
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Behavior of Prestressed Concrete Beam using Reactive Powder Concrete Ignatius H. Sumartono; Heru Purnomo; Sidiq Purnomo; Feryandy Murdono
Journal of Civil Engineering Vol. 38 No. 3 (2023)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v38i03.7451

Abstract

The behavior of prestress pretension beams made of Reactive Powder Concrete (RPC) concrete with compressive strength above 120 MPa included in the Ultra High Performance Concrete (UHPC) classification was investigated to study the mechanical properties of concrete and the performance of prestressed beams against static load tests. The mechanical properties of RPC materials include concrete compressive strength, concrete tensile strength, concrete elastic modulus values and concrete density compared to 70 MPa High Strength Concrete (HSC) concrete. Curing concrete at an early age using high temperature hot steam (steam curing) ensures the development of the compressive strength of concrete. Experimental tests were carried out on 4 pretension beams designed to be used as highway bridge beams, namely beam #1 (30/50-HSC-NF-S); beam #2 (30/50-RPC-F-S); beam #3 (17/50-RPC-NF-S); beam #4 (17/50-RPC-NF-S). The mechanical properties of RPC concrete show superior values compared to HSC concrete. From the results of the static test, only beam #3 (RPC beam which does not use steel fiber in mixing) which shows a value of flexural resistance below the theoretical value due to brittle destruction that occurs in the beam. Steel fiber effectively maintains beam integrity thereby maximizing bending resistance, preventing explosive brittle destruction, and preventing concrete fragmentation during peak loads.
PENGEMBANGAN MODUL PEMBELAJARAN DEEP LEARNING UNTUK MENINGKATKAN KEMAMPUAN PENALARAN KRITIS SISWA MATEMATIKA DI SD N 2 PEDES Maria Margaretha; Heru Purnomo
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 01 (2026): Volume 11 No. 01, Maret 2026 Release
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i01.42989

Abstract

The development of a deep learning–based instructional module aimed to enhance third-grade students’ critical reasoning skills in mathematics, specifically on multiplication material at SD Negeri 2 Pedes. This study sought to analyze the feasibility, practicality, and effectiveness of the developed module in improving students’ critical reasoning abilities at the elementary school level. The research employed a Research and Development (R&D) method using the ADDIE model, which consists of five stages: Analysis, Design, Development, Implementation, and Evaluation. The research subjects were 17 third-grade students of SD Negeri 2 Pedes. The research instruments included expert validation sheets (material experts and module experts), teacher and student response questionnaires, and pretest–posttest instruments. The data were analyzed using descriptive quantitative techniques to determine the level of validity, practicality, and effectiveness of the module.The results indicated that the module achieved a feasibility percentage of 85% from the material expert and 80% from the module expert, both categorized as highly feasible. The responses from the teacher and students in the field trial reached 86.66% and 80%, respectively, which were categorized as highly practical. In terms of effectiveness, the students’ average score increased from 67.35 in the pretest to 83.82 in the posttest, with an N-Gain value of 0.4595 (moderate category). These findings demonstrate that the deep learning–based instructional module is feasible, practical, and effective in enhancing third-grade students’ critical reasoning skills in multiplication material at the elementary school level.Top of Form
Co-Authors Aftin Nazakia Ajeng T Normawati Ajeng Titah Normawati Anjani Okatafianti, Atikah Annisa Nur Aena Aprilia, Wida Arif Pristianto Arin Nur Fathonah Asna Arif Fathonah Asri Wiji Astuti Deri Anggraini Devia Putri Agnesia Dewi Purwaningsih Dwi Rosella Komala Sari Ernanda Zainovita fajarmaulana Feryandy Murdono haflah, khairuna Hazzima Nengsih Hotib Ignatius H. Sumartono Ikhsan, Wahyu Amirul Ilham Yugantara Jennifer Del Amore, Maria Joni Siswanto Khoirul Sofyan Kurniawati, Ikhsanty Novita Lilik Suprasno Maria Margaretha maria, Okky Melani Dewi Mu'awanah Mu'awanah Mu'awanah Muawanah Muawanah Muhamad Nor Mudhofar Muhardila Fauziah Muninggar Setia Pratama Muslimah Dwi Nurcahyani Mu’awanah Nara Puspitaningrum, Mareeta Ningrum Perwitasari Nisa Hanna Fazira Nova Putri Anugrah Pambayun S Uripno Pambayun Sugeng Uripno Pratiwi, Josi Anggi Raden Shafira Saniyyah Ramadhani Rahma Septiara Rendika Cipta Saputra Ronald Rizal Shidiq Safitri Idawati Salsabila, Anisa Samadi Sidiq Purnomo Sintia Herlina Siti Fadhilah Suci Anis Kunaifi Suryo Saputra Perdana Susi Widia Astuti Tania Linda Rizky Tantri Vidliana Tasya Ghea Amanda Taufik Eko Susilo Tomiana Tomiana Vika Farida Wahyu Kurniawati wahyuni wahyuni Zara Sugiyarti