Papers by Erniati Bachtiar
ARPN Journal of Engineering and Applied Sciences , 2020
Fly ash is a side waste from the cement industry that can damage the environment. Fly ash has the... more Fly ash is a side waste from the cement industry that can damage the environment. Fly ash has the potential as an essential material in making geopolymers. The study discusses how the relationship of the use of activator composition with the compressive strength of geopolymer mortar using fly ash. The sample uses activator sie NaOH and Na2SiO3. The sample uses several variations of NaOH composition and alkali modulus. NaOH variations consist of 13 M, 14 M, 15 M, and 16 M. Variations in alkali modulus include 1.5, 1.75, 2.00, 2.25, and 2.50. Treatment of samples according to room temperature and compressive strength testing was carried out at 7, 14, 28, and 56 days. Research has shown that the correlation between NaOH and alkali modulus on mortar strength is very significant. The highest compressive strength occurs at 14 M of all variations. The relationship of activator composition and compressive strength form 2nd polynomial equation order and NaOH optimum composition occurs between 14 and 15 M.
ARPN Journal of Engineering and Applied Sciences (ISSN 1819-6608), 2020
Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by c... more Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by curing oven with measured duration and temperature. Temperature and term used in the oven curing on the geopolymer mortar. They affect the strength of geopolymer mortar. This study aimed to determine the connection of duration and temperature used in the curing oven to the compressive strength of C-type fly ash based geopolymer mortar. The constituent material of geopolymer mortar is activators, fly ash, and sand-the activator using NaOH and Na2SiO3. A comparison of fly ash and sand is 1: 2.75. Comparison NaOH: Na2SiO3 is 1: 2 and 10 M NaOH. Oven temperature variations used45 o C, 65 o C, 85 o C, 105 o C, and 125 o C, and differences in the duration of use 20 hours, 10 hours, 8 hours, 6 hours, and 4 hours. The results showed that the connection of temperature and term used in the oven curing of the compressive strength of geopolymer mortar is significant. The relationship between duration and compressive strength has a non-linear polynomial equation negative. The period and temperature optimal for curing C-type Fly Ash based geopolymer mortar is the temperature of 105oC and the duration of 8 hours.
Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by c... more Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by curing oven with measured duration and temperature. Temperature and term used in the oven curing on the geopolymer mortar. They affect the strength of geopolymer mortar. This study aimed to determine the connection of duration and temperature used in the curing oven to the compressive strength of C-type fly ash based geopolymer mortar. The constituent material of geopolymer mortar is activators, fly ash, and sand -the activator using NaOH and Na2SiO3. A comparison of fly ash and sand is 1: 2.75. Comparison NaOH: Na2SiO3 is 1: 2 and 10 M NaOH. Oven temperature variations used45 o C, 65 o C, 85 o C, 105 o C, and 125 o C, and differences in the duration of use 20 hours, 10 hours, 8 hours, 6 hours, and 4 hours. The results showed that the connection of temperature and term used in the oven curing of the compressive strength of geopolymer mortar is significant. The relationship between duration and compressive strength has a non-linear polynomial equation negative. The period and temperature optimal for curing C-type Fly Ash based geopolymer mortar is the temperature of 105oC and the duration of 8 hours.
Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by c... more Oven curing gives effect to the strength of geopolymer mortar. The geopolymer mortar treated by curing oven with measured duration and temperature. Temperature and term used in the oven curing on the geopolymer mortar. They affect the strength of geopolymer mortar. This study aimed to determine the connection of duration and temperature used in the curing oven to the compressive strength of C-type fly ash based geopolymer mortar. The constituent material of geopolymer mortar is activators, fly ash, and sand -the activator using NaOH and Na2SiO3. A comparison of fly ash and sand is 1: 2.75. Comparison NaOH: Na2SiO3 is 1: 2 and 10 M NaOH. Oven temperature variations used45 o C, 65 o C, 85 o C, 105 o C, and 125 o C, and differences in the duration of use 20 hours, 10 hours, 8 hours, 6 hours, and 4 hours. The results showed that the connection of temperature and term used in the oven curing of the compressive strength of geopolymer mortar is significant. The relationship between duration and compressive strength has a non-linear polynomial equation negative. The period and temperature optimal for curing C-type Fly Ash based geopolymer mortar is the temperature of 105oC and the duration of 8 hours.
The number of problems found in the construction world include the difficulty or lack of fresh wa... more The number of problems found in the construction world include the difficulty or lack of fresh water in some areas to be mixed in the concrete, negligence in the maintenance of concrete and working process of concrete mainly on the concrete structures have a complex reinforcement and high concrete building structures. This study aims to find out the compressive strength, splitting tensile strength, absorption, and porosity of Self Compacting Concrete (SCC) using sea water as mixing water and with or without curing in sea water. The test specimens were made for each test specimen with the variation on age 1 day, 3 days, 7 days, 28 days and 90 days. The test method of compressive strength according to ASTM 39/C 39M-12a standard, tensile strength according to ASTM C496 / C496M-11 standard and the porosity and absorption according to ASTM C642-13 standard. The result of research was 1) the decrease in compressive strength in the specimen SCC-SWC was from 3 days, 7 days, 28 days and 90 days consecutive 13.20%, 12.90%, 12.80%, and 12.50%; 2) the decreases in splitting tensile strength in the specimen SCC-SWC were from the age of 3 days, 7 days, 28 days until the age of 90 days consecutive by 3.10%, 8.05%, 9.51%, and 9.21%; 3) the increase in the porosity values on the specimen SCC seawater without cured in sea water (SCC-SWC) at age 3 days, 7 days, 28 days and 90 days was 2.86%, 7.90%, 5.86%, and 5.55%, respectively; 4) the increase in the absorption values on the specimen SCC without curing at 3 days, 7 days, 28 days and 90 days was 15.80%, 20.57%, 15.84%, and 30.80%, respectively. The increase in mechanical properties (compressive strength and tensile strength) in the both of the specimen SCC-SC and SCC-SWC along with the decrease of porosity and absorption. Conversely, the decrease of compressive strength and tensile strength in the both of the specimen SCC-SC and SCC-SWC along with the increase in porosity and absorption value in the SCC.
ABSTRAK Self Compacting Concrete (SCC) merupakan salah satu solusi untuk mendapatkan konstruksi b... more ABSTRAK Self Compacting Concrete (SCC) merupakan salah satu solusi untuk mendapatkan konstruksi beton yang mempunyai ketahanan yang baik. Ketahanan beton diperoleh dengan pemadatan yang baik dengan dilakukan oleh tenaga-tenaga kerja terampil. Namun demikian, salah satu kelalaian yang sering terjadi dilapangan yakni mengabaikan curing pada beton keras setelah pengecoran. Penelitian ini membahas tentang workability beton segar dan sifat mekanik (kuat tekan dan kuat tarik belah) pada SCC tanpa curing. Pengujian workability berdasarkan standar EFNARC. Uji sifat mekanik berdasarkan standar ASTM. Metode pengujian kuat tekan sesuai standar ASTM 39/C 39M – 12a, sedangkan kuat Tarik belah sesuai satndar ASTM C496/C496M-11. Hasil penelitian menunujukkan bahwa SCC tanpa curing memberikan efek penurunan pada kuat tekan pada umur 1, 3, 7, 28, dan 90 hari berturut-turut sebesar 4,11 MPa (16,1%); 4,90 MPa (13,9%); 6,64 MPa (13,1%); dan 6, 72 MPa (12,75%). Kuat tarik belah terjadi penurunan berturut-turut sebesar 0,1 MPa (3,25%); 0,26 MPa (7,99%); 0,4 MPa (9,52%); dan 0,39 MPa (9,16%). ABSTRACT Self Compacting Concrete (SCC) is one solution to get concrete construction which it has good resistance. Durability of concrete was obtained by the good concrete compaction to be done by a skilled workforce. However, one of the negligence that often occur in the field ie after casting they was ignoring curing of the hardening concrete. This study discusses the workability of fresh concrete and mechanical properties (compressive strength and splitting tensile strength) on SCC without curing. Testing of the concrete workability based on EFNARC standard. The mechanical properties test based on ASTM standards. The method Compressive strength test based on ASTM standards 39 / C 39M-12a, whereas splitting tensile strength accordance standard ASTM C496 / C496M-11. The results of the study indicate that the SCC without curing effect on the reduction in compressive strength at ages 1, 3, 7, 28, and 90 days in a row at 4.11 MPa (16.1%); 4.90 MPa (13.9%); 6.64 MPa (13.1%); and 6, 72 MPa (12.75%). Splitting tensile strength decreased respectively by 0.1 MPa (3.25%); 0.26 MPa (7.99%); 0.4 MPa (9.52%); and 0.39 MPa (9.16%). PENDAHULUAN Teknologi beton saat ini berkembang sangat pesat. Penelitian yang inovatif dilakukan untuk mendapatkan sesuatu yang baru sebagai upaya meningkatkan kualitas beton bermunculan. Semua yang dilakukan para peneliti dimaksudkan untuk menjawab permasalahan yang timbul dalam penggunaan bahan dalam pencampuran beton serta mengatasi kendala-kendala yang sering terjadi dalam pelaksanaan pekerjaan di
Teknologi konstruksi beton diarahkan bersifat berkelanjutan dan ramah lingkungan. Limbah cangkang... more Teknologi konstruksi beton diarahkan bersifat berkelanjutan dan ramah lingkungan. Limbah cangkang kemiri sebagai pengganti agregat kasar campuran beton diketahui bahwa cangkang kemiri memiliki tekstur yang keras sehingga kemungkinan dapat digunakan sebagai pengganti agregat kasar. Tujuan penelitian ini adalah untuk mengetahui pengaruh limbah cangkang kemiri sebagai pengganti agregat kasar terhadap sifat fisik (slump test, bleeding, segregation, berat isi) dan sifat mekanik (kuat tekan dan kuat tarik belah) beton yang menggunakan cangkang kemiri sebagai material pengganti agregat kasar. Variasi penelitian adalah variasi persentase cangkag kemiri pada campuran beton yakni sebesar 0%, 25%, 50%, 75% dan 100% terhadap volume agregat kasar pada campuran beton. Jumlah benda uji masing-masing 5 buah setiap variasi. Pengujian sifat mekanik beton (kuat tekan dan kuat tarik belah) dilakukan pada umur 28 hari. untuk uji kuat tekan beton, dan 28 hari untuk kuat tarik belah beton serta berat isi beton. Beton yang menggunakan cangkang kemiri sebagai pengganti agregat kasar mengalami penurunan kuat tekan pada sampel BC-25, BC-50, BC-75, BC-100 berturut-turut sebesar 11,72 MPa (37,71%); 15,54 MPa (50,00%); 18,35 MPa (59,02%); dan 18,85 MPa (60,66%) dari kuat tekan BN sebesar 31,08 Mpa. Beton yang menggunakan cangkang kemiri sebagai pengganti agregat kasar mengalami penurunan kuat tarik belah pada sampel BC-25, BC-50, BC-75, BC-100 berturut-turut sebesar 0,95 MPa (28,70%); 1,21 MPa (36,56%); 1,27 MPa (38,37%); dan 1,40 MPa (42,30%) dari kuat tarik belah BN sebesar 3,31 MPa. Menurunnya nilai berat isi, kuat tekan dan kuat tarik belah sangat dipengaruhi oleh bertambahnya persentase cangkang kemiri pada beton.
Seawater is one of natural resources that is very abundant. According to the United Nations in 20... more Seawater is one of natural resources that is very abundant. According to the United Nations in 2050, more than half of the world's population will not be able to get enough drinking water. Indonesia is an archipelago country so much that the quality of the source water area does not qualify as a drinking water. Concrete construction in areas that are likely very minimal quantity of fresh water or no, then the seawater cannot be avoided in mixing concrete.
This article is a review of the literature/prior research related to concrete using seawater. Mixing concrete using seawater on concrete can increase the compressive strength when compared to using fresh water. This is because the seawater does not interfere with the hydration process of the formation of calcium silicate hydrate gel/ tobermorite (CSH) and calcium hydrate/portlandite (CH). In addition to the salt content in the seawater that NaCl will react on fresh concrete will form salt crystals Friedel (Friedel's salt: 3CaO. Al2O3. CaCl2. 10H2O) which can improve the higher pH, and alkalinity increases so will activate the hydration of cement and provide structure pasta is more dense with pores smaller, safe to use seawater as mixing water in the concrete. Thus, the possibility of seawater will be used as mixing water in concrete without reducing the strength and durability of concrete
Books by Erniati Bachtiar
Seamolec, WWW.seamolec.org, 2020
WWW.seamolec.org, SEAMEO SEAMOLEC, Tangerang, 2020
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Papers by Erniati Bachtiar
This article is a review of the literature/prior research related to concrete using seawater. Mixing concrete using seawater on concrete can increase the compressive strength when compared to using fresh water. This is because the seawater does not interfere with the hydration process of the formation of calcium silicate hydrate gel/ tobermorite (CSH) and calcium hydrate/portlandite (CH). In addition to the salt content in the seawater that NaCl will react on fresh concrete will form salt crystals Friedel (Friedel's salt: 3CaO. Al2O3. CaCl2. 10H2O) which can improve the higher pH, and alkalinity increases so will activate the hydration of cement and provide structure pasta is more dense with pores smaller, safe to use seawater as mixing water in the concrete. Thus, the possibility of seawater will be used as mixing water in concrete without reducing the strength and durability of concrete
Books by Erniati Bachtiar
This article is a review of the literature/prior research related to concrete using seawater. Mixing concrete using seawater on concrete can increase the compressive strength when compared to using fresh water. This is because the seawater does not interfere with the hydration process of the formation of calcium silicate hydrate gel/ tobermorite (CSH) and calcium hydrate/portlandite (CH). In addition to the salt content in the seawater that NaCl will react on fresh concrete will form salt crystals Friedel (Friedel's salt: 3CaO. Al2O3. CaCl2. 10H2O) which can improve the higher pH, and alkalinity increases so will activate the hydration of cement and provide structure pasta is more dense with pores smaller, safe to use seawater as mixing water in the concrete. Thus, the possibility of seawater will be used as mixing water in concrete without reducing the strength and durability of concrete