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"Penggunaan sumber daya alam sebagai pembuat beton semakin meningkat belakangan ini sehingga menambah jumlah limbah beton. Penelitian ini akan menggunakan agregat kasar dan agregat halus daur ulang sebagai agregat pada beton. Komposisi benda uji terdiri dari 40% agregat kasar daur ulang dan 0%, 20%, 40% dan 60% agregat halus daur ulang dari limbah beton mutu K350-K400. Pengujian meliputi pengujian kuat tekan, kuat lentur, dan susut pada beton. Kuat tekan beton pada komposisi 20% agregat halus daur ulang meningkat 5,18% dari beton normal pada umur 28 hari. Kuat lentur beton dengan komposisi agregat halus daur ulang 20% memiliki nilai yang paling tinggi dibandingkan komposisi lainnya. Susut beton dengan komposisi 60% agregat halus daur ulang mempunyai nilai susut tertinggi dibandingkan dengan komposisi lainnya.

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The using of natural resources to make concrete is increase nowadays that can gain the concrete waste. This study will use fine and coarse recycle aggregate as aggregate as aggregate in concrete. The composition of the test object consisting of 40% coarse recycle aggregate and 0%, 20% 40%, and 60% fine recycle aggregate from concrete waste K350-K400. Testing includes, compressive strength test, flexural strength, and shrinkage in concrete. The purpose of this study is to know the influence of coarse and fine recycle aggregate to compressive strength, flexural strength, and shrinkage in concrete and the optimum composition of the fine recycle aggregate to be used. Compressive strength of concrete with 20% recycled fine aggregate increased by 5,18% of the normal concrete at 28 days. Flexural strength of concrete with 20% recycled fine aggregate has the highest value than other composition. Shrinkage of concrete with 60% recycled fine aggregate has the highest shrinkage value compared to other composition."

"Fully updated coverage of construction planning techniques and equipment technology. Construction Planning, Equipment, and Methods, Ninth Edition, follows in the footsteps of previous editions by laying out the fundamentals of machine utilization and production estimating in a logical, simple, and concise format. The book discusses the latest technologies and capabilities and offers real-world applications. Examples and illustrations showcase the newest equipment models, and end-of-chapter summaries and homework problems reinforce salient points. You will explore construction economics, earthwork, and soil and rock properties"

"Beberapa pembangunan gedung kantor di lingkungan BPJS Ketenagakerjaan selama 5 (lima) tahun terakhir mengalami keterlambatan dalam penyelesaian proyek. Hal tersebut disebabkan proses pengendalian pembangunan gedung kantor belum belum berjalan dengan baik dengan memperhatikan risiko yang dapat mempengaruhi kinerja waktu. Penelitian ini menggunakan kuesioner sebagai instrument penelitian yang disebarkan kepada responden dan dilakukan validasi oleh pakar. Analisa risiko kualitatif dilakukan pada penelitian untuk mengetahui faktor risiko yang ada selama siklus hidup pembangunan gedung dan mengembangkannya dengan manajemen risiko berbasis PMBOK edisi keenam. Hasil dari penelitian ini berupa faktor risiko tinggi dan respon risiko untuk pengembangan pedoman pengendalian proyek pembangunan gedung kantor yang ada di lingkungan BPJS Ketenagakerjaan sehingga dapat meningkatkan kinerja waktu proyek.

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Several office building constructions within BPJS Ketenagakerjaan during the last 5 (five) years have experienced delays in project completion. This is because the control process for the construction of office buildings has not gone well by taking into account the risks that can affect time performance. This study used a questionnaire as a research instrument distributed to respondents and validated by experts. Qualitative risk analysis was carried out in research to determine the risk factors that exist during the building construction life cycle and develop them with risk management based on PMBOK sixth edition. The results of this study are in the form of high-risk factors and risk responses for developing guidelines for controlling office building construction projects within the Employment BPJS to improve project time performance."

"Dalam dunia konstruksi, perubahan ruang lingkup (variation order) merupakan hal yang sering terjadi, banyak faktor yang menyebabkan variation order yang tidak dapat dihindarkan, salah satunya terjadi akibat pihak konsultan. Karena tugas utama konsultan  memberikan representasi grafis dan tertulis dalam bentuk dokumentasi gambar dan dokumen laporan yang memungkinkan pihak kontraktor dan subkontraktor mengubah konsep dan gagasan menjadi realitas fisik, kesalahan desain, desain kurang memadai ataupun kurangnya koordinasi merupakan penyebab yang biasa dilakukan oleh pihak konsultan.Dibutuhkan strategi dalam sebuah proses perancangan yang baik agar meminimalisir terjadinya variation order. Studi ini bertujuan untuk mengidentifikasi tahapan proses perancangan, mengidentifikasi peristiwa risiko yang terjadi ditahap perancangan yang menyebabkan terjadinya variation order, serta strategi untuk menurunkan variation order yang disebabkan oleh pihak konsultan perencana.Sehingga dapat memberikan kepuasan bagi pihak pemangku kepentingan khususnya perencana dalam menghasilkan karya yang dapat dipertanggungjawabkan. Metode Penelitian ini menggunakan metode kualitatif dengan menggunakan media bantu kuisioner.  Berdasarkan penelitian sebelumnya hasil penelitian merupakan adanya kesalahan dalam mempersiapkan dokumen yang dilakukan oleh pihak konsultan sehingga hal ini yang memicu terjadinya variation order.

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In the world of construction, changes in scope (variation orders) are a frequent occurrence, many factors cause unavoidable variation orders, one of which occurs due to the consultant. Because the main task of the consultant is to provide graphic and written representations in the form of drawing documentation and report documents that allow contractors and subcontractors to turn concepts and ideas into physical reality, design errors, inadequate designs or lack of coordination are common causes for consultants.It takes a strategy in a good design process in order to minimize the occurrence of variation orders. This study aims to identify the stages of the design process, identify risk events that occur at the design stage that cause variation orders, as well as strategies to reduce variation orders caused by the planning consultant.So that it can provide satisfaction for stakeholders, especially planners in producing work that can be accounted for. Methods This research uses a qualitative method by using a questionnaire as a media. Based on previous research, the results of the study were an error in preparing documents made by the consultant so that this triggered the variation order.

 

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"The book consists of two parts. The first part provides basic information about normal concrete, its grades used on sites and various kinds of modified concretes such as fiber-reinforced concrete, sulphur concrete, roller compacted concrete, high performance concrete, ultra- high performance concrete, and flowing concrete. . It further addresses physical properties of concrete and various types of Portland cement, blended cements, admixtures, additives including properties of aggregates and their influence. The second part of the book highlights the principal causes of concrete deterioration along with protective measures, resulting from incorrect selection of constituent materials, poor construction methods, external factors, chemical attack, corrosion problems, hot and cold weather effects, and the various errors in designing and detailing. Featuring an extensive bibliography of the highly adopted standards as well as manuals and journals critical to the construction industry at the end of each chapter, the volume offers readers an advanced understanding of the theory and practical application of concrete technology and international standards in North America and Britain."

"Konstruksi merupakan bagian dalam perkembangan infrastruktur dan industri konstruksi. Fakta yang menunjukkan bahwa tingkat kerusakan lingkungan sudah cenderung meningkat, relatif mudah untuk ditemukan. Salah satunya disebabkan oleh kegiatan pembangunan. Pada saat ini ada sebuah konsep Green Construction yang dapat menimalisir dampak negatif terhadap lingkungan.Penelitian dilakukan untuk melihat pengaruh penerapan konsep green construction pada pembangunan gedung terhadap kinerja mutu proyek. Metode yang digunakan adalah survei. Metoda ini digunakan untuk menjawab pertanyaan dari penelitian yang dilakukan. Data didapat dari kuisioner kepada responden yang terkait terhadap pelaksanaan proyek yang telah menggunakan konsep green construction ini. Pengolahan data dilakukan menggunakan SPSS.

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Construction is part of infrastructure development and construction industry. Facts showing that the level of environmental damage is likely to increase, relatively easy to find. One of them caused by construction activities. At this time there is a concept that can menimalisir Green Construction negative impacts on the environment.The study was conducted to see the effect of applying the concept of green building construction on the project quality performance. The method used was survey. This method is used to answer questions from the research undertaken. Data obtained from questionnaires to the respondents related to the implementation of projects that have used this concept of green construction. Data processing was performed using SPSS."

"Sektor rumah tangga adalah konsumen energi terbesar di Indonesia. Instrumen yang menggunakan energi paling besar pada sektor ini adalah sistem penyejuk udara sebagai akibat dari iklim tropis Indonesia yang membuat temperatur udara lebih tinggi daripada temperatur standar kenyamanan termal. Phase change material (PCM) berpotensi mengurangi konsumsi energi dengan menurunkan besar envelope heat transfer rate yang masuk ke dalam bangunan. Pemilihan PCM serta konfigurasi integrasinya dengan material bangunan krusial dalam menentukan performanya. Pemilihan didasarkan pada kondisi iklim tempat pengaplikasian PCM. Penelitian ini akan menguji performa termal beberapa PCM yang diintegrasikan dengan material bangunan bata beton ringan memanfaatkan simulasi numerikal pada peranti lunak EnergyPlus. Integrasi material bangunan bata beton ringan dengan satu jenis PCM bernama RT 35 yang diproduksi oleh Rubitherm Technologies GmbH, menghasilkan reduksi envelope heat gain transfer rate paling baik. Konfigurasi integrasi yang menempatkan PCM pada lapisan tengah material bangunan memiliki performa yang lebih baik jika dibandingkan konfigurasi yang menempatkan PCM pada lapisan luar serta dalam tembok bangunan. Hal tersebut terjadi karena penempatan PCM pada lapisan tengah memberikan perbedaan temperatur PCM yang lebih rendah dengan sekitarnya. Analisis sifat termal terhadap PCM RT 35 dengan ketebalan 20 mm yang ditempatkan pada lapisan tengah menghasilkan peningkatan hambatan termal tembok sebesar 0,141 m2-K/W.

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Household sector consumes the largest amount of energy compared to other sectors in Indonesia. The most consuming instrument is the air conditioning (AC) system as the tropical climate of Indonesia yields outdoor temperature that is higher than the standardized temperature for thermal comfort. Phase change material (PCM) possesses potential to reduce the employment of energy for the AC system by reducing the total envelope heat transfer rate incorporated into a building through the walls. However, the selection of PCM and its configuration of integration with the building materials are subjected to the climate environment. This study conducted examination of the thermal performance of some PCMs that are integrated with lightweight concrete through numerical simulation using EnergyPlus software. The integration of lightweight concrete with a PCM titled RT 35 manufactured by Rubitherm Technologies GmbH company yield the highest envelope heat gain transfer rate reduction. Meanwhile, the configuration that placed the PCM in the middle layer of the building material performs better than the configurations that placed the PCM on the outer and the inner surface of the wall. This is due to the PCM being imposed to a smaller temperature difference with its surroundings. Analysis of the thermal properties of the 20 mm thick PCM RT 35 that is placed on the middle layer of the walls also yields thermal resistance value of the wall which is 0.141 m2-K/W.

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