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American Society for Testing and Materials

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Properties Of Concrete

Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective

A critical review and assessment for usage of recycled aggregate as sustainable construction material

Thank you for reading design and control of concrete mixtures. Maybe you have knowledge that, people have look numerous times for their chosen books like this design and control of concrete mixtures, but end up in infectious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they cope with some infectious virus inside their desktop computer. design and control of concrete mixtures is available in our digital library an online access to it is set as public so you can download it instantly. Our book servers saves in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the design and control of concrete mixtures is universally compatible with any devices to read.

Design And Control Of Concrete Mixtures

Ammonia synthesis requires high pressure and high temperature process. Unfortunately, the capital intensive cost resulting low yield of ammonia by using recent catalyst which is iron oxide. Therefore, manganese zinc ferrite as a soft ferrite material will be introduced as a new nanocatalyst to enhance the ammonia yield. As a new nanocatalyst for ammonia production, study of comparasion two different concentration of MnZn Ferrite is very important. This paper will compare the yield of ammonia by using two different nanocatalyst which are Mn 0.4 Zn 0.6 Fe 2 O 4 and Mn 0.6 Zn 0.4 Fe 2 O 4 . Both were synthesized by sol-gel method and has been characterize by using FESEM (morphology), XRD (phase identification), EDX (elemental analysis) and TPR (oxide reduction). The ammonia was produce with and without magnetic field applied. The result shows that the ammonia yield is higher for Mn 0.4 Zn 0.6 Fe 2 O 4 nanocatalyst than Mn 0.6 Zn 0.4 Fe 2 O 4 by using magnetic field applied. 67.2% of yield has been achieved by using new nanocatalyst Mn 0.6 Zn 0.4 Fe 2 O 4 and magnetic field applied at ambient environment.

/pdf/properties-of-mn0-4zn0-6fe2o4-and-mn0-6zn0-4fe2o4-as-2ujbrnq6ws.pdf

Properties of Mn0.4Zn0.6Fe2O4 and Mn0.6Zn0.4Fe2O4 as Nanocatalyst for Ammonia Production

Abstrak — Penelitian ini berfokus pada pemanfaatan bottom ash sebagai bahan dasar pembuatan paving geopolimer. Diketahui bahwa bottom ash merupakan limbah hasil pembakaran batu bara yang jarang dimanfaatkan dibandingkan dengan fly ash . Selain itu digunakan SCBA ( Sugar Cane Bagasse Ash ) sebagai sumber silika aktif untuk menambah kandungan silika pada bottom ash . Agregat atau filler pada paving geopolimer menggunakan abu batu, sedangkan untuk binder (pengikat) menggunakan larutan alkali aktifator. Hasil pengujian menunjukkan bahwa semakin banyak penambahan berat SCBA pada paving geopolimer justru menurunkan kualitas dari paving tersebut. Dari pengujian kuat tekan paving diperoleh hasil kuat tekan maksimal pada umur 28 hari dengan penambahan berat SCBA 0%, yaitu sebesar 11.60 MPa. Nilai keausan paling besar terjadi pada paving dengan penambahan berat SCBA 35%, yaitu yaitu sebesar 3.12 mm/menit, sedangkan keausan paling kecil terjadi pada paving dengan penambahan berat SCBA 30% yaitu sebesar 0.72 mm/menit, terjadi ketimpangan nilai keausan paving dikarenakan benda uji terendam banjir sehingga menyebabkan perbedaan kualitas antar paving dalam pengujian keausan, sedangkan resapan air paving paling kecil terjadi pada paving dengan penambahan berat SCBA 0% yaitu sebesar 10.58%. Sehingga diperoleh kesimpulan akhir bahwa paving geopolimer tidak memenuhi persyaratan standar paving berdasarkan SNI 03-0691-1996 namun memenuhi syarat untuk dijadikan bata sebagai pasangan dinding kelas I berdasarkan SNI 03-0349-1989.

/pdf/paving-geopolimer-berbahan-dasar-bottom-ash-dan-sugar-cane-4b165zmgms.pdf

Paving Geopolimer Berbahan Dasar Bottom Ash dan Sugar Cane Bagasse Ash (SCBA)

Experimental and analytical study for shear strengthening of reinforced-concrete beams using a prefabricated geopolymer–mortar panel

Nonlinear finite element study on element size effects in alkali-activated fly ash based reinforced geopolymer concrete beam

Quality of fly ash is varying widely in the field, it depends on the combustion process and the quality of the basic ingredients, namely coal. It will affect the physical and mechanical properties of the concrete mixtures used. This study used 12 samples of fly ash. The physical and chemical properties and finesse modulus were analyzed. The fly ash was mixed with OPC (Ordinary Portland Cement) with the proportion of 20% fly ash and 80% OPC. The specimens were form with mortar dimension of 5cm x 5 cm. The test was affected by the correlation of fly ash fineness modulus to compressive strength, correlation density of fly ash to compressive strength, and correlation of carbon content to the compressive strength.

https://iopscience.iop.org/article/10.1088/1757-899X/267/1/012003/pdf

Januarti Jaya Ekaputri

Papers

Properties of Mn0.4Zn0.6Fe2O4 and Mn0.6Zn0.4Fe2O4 as Nanocatalyst for Ammonia Production

Paving Geopolimer Berbahan Dasar Bottom Ash dan Sugar Cane Bagasse Ash (SCBA)

Experimental and analytical study for shear strengthening of reinforced-concrete beams using a prefabricated geopolymer–mortar panel

Nonlinear finite element study on element size effects in alkali-activated fly ash based reinforced geopolymer concrete beam

Physical and Chemical Character of Fly Ash of Coal Fired Power Plant in Java