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Influence of hybrid fibers on toughtness behavior of high flowing concrete
Eethar Thanon Dawood, Mahyuddin Ramli
Archives of Civil Engineering , 2011, DOI: 10.2478/v.10169-011-0018-0
Abstract: This study investigates the use of steel fibers and hybrid composite with a total fibers content of 2% on the high strength flowing concrete and determines the density, compressive strength, static modulus of elasticity, flexural strength and toughness indices for the mixes. The results show that the inclusion of more than 0.5% of palm fibers in hybrid fibers mixes reduces the compressive strength. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fibers with palm fibers can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fibers (1.5 steel fibers + 0.5% palm fibers) in specimens increases significantly the toughness indices and thus the use of hybrid fibers combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances.
Evaluation of Flowable High Strength Concrete Used as Repair Material (Review Study)
Eethar Thanon Dawood,Mahyuddin Ramli
Journal of Applied Sciences , 2011,
Abstract: The use of fibers in concrete or mortar is well known for their potential to enhance the flexural toughness, the energy dissipation and the impact resistance for many structural applications especially in building repairs and other Civil Engineering works. The use of fibers in flowable concrete provides great advantages in arresting cracks and enhancing the flexural rigidity of the composite material. Hence, this study investigates the procedure of tests required to determine the conductivity of the repair material by adoption of some combined systems of repair materials with concrete and the bond action of this repair material (Flowable high strength system).
Properties of High-Strength Flowable Mortar Reinforced with Palm Fibers
Eethar Thanon Dawood,Mahyuddin Ramli
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/718549
Abstract:
Properties of High-Strength Flowable Mortar Reinforced with Palm Fibers
Eethar Thanon Dawood,Mahyuddin Ramli
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/718549
Abstract: This study was conducted to determine some physical and mechanical properties of high-strength flowable mortar reinforced with different percentages of palm fiber (0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, and 1.6% as volumetric fractions). The density, compressive strength, flexural strength, and toughness index were tested to determine the mechanical properties of this mortar. Test results illustrate that the inclusion of this fiber reduces the density of mortar. The use of 0.6% of palm fiber increases the compressive strength and flexural strength by about 15.1%, and 16%, respectively; besides, the toughness index (I5) of the high-strength flowable mortar has been significantly enhanced by the use of 1% and more of palm fiber. 1. Introduction High-strength concrete or mortar subjected to axial compression is known to be a brittle material with almost no strain-softening behavior. Adding fibers to plain matrix has little or no effect on its precracking behavior but does substantially enhance its postcracking response, which leads to a greatly improved toughness and impact behavior. The application of fibers in concrete was regarded very difficult in the past, due to insufficient workability of fiber reinforced mixtures. The development of superplasticizer has proven to offer significant improvement in application of fibers like in slabs and floors, shell domes, rock slope stabilization, refractory linings, composite metal decks, seismic retrofitting, repair and rehabilitation of structure, fire protection coatings, concrete pipes and [1]. Over the last three decades, fiber-reinforced concrete (FRC) has been the subject of many investigations. Researches have been performed on the behavior of fiber-reinforced concrete subjected to various types of loading and incorporating different fibers ranging from steel, glass, plastic, and natural fibers in various sizes and shapes [2]. Natural fibers have the potential to be used as reinforcement to overcome the inherent deficiencies in cementitious materials. In recent years, there has been sustained interest in utilizing natural fibers in cement composites and in manufacturing products based on them with a view to have alternate building materials, which are energy efficient, economical, and ecofriendly. If the function of natural fibres in a relatively brittle cement matrix is to achieve and maintain toughness and ductility of the composite, then, the durability of such fibres in a highly alkaline cement matrix must be taken into consideration and ensured by effective modifications made either to the fibre
Evolution of Durable High-Strength Flowable Mortar Reinforced with Hybrid Fibers
Eethar Thanon Dawood,Mahyuddin Ramli
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/730862
Abstract: The production and use of durable materials in construction are considered as one of the most challenging things for the professional engineers. Therefore, this research was conducted to investigate the mechanical properties and the durability by using of different percentages of steel fiber with high-strength flowable mortar (HSFM) and also the use of the hybridization of steel fibers, palm fibers, and synthetic fiber (Barchip). Different experimental tests (compressive strength, splitting tensile strength, flexural strength, and static modulus of elasticity among others) were determined after 90 days of normal water curing and 180 days of seawater exposure. The results indicate that hybrid fibers of 1.5% steel fibers？+？0.25% palm fibers？+？0.25% Barchip fibers provide significant improvement in the different mechanical properties of HSFM. Besides, the hybridization of fibers was found to be effective in the terms of durability (exposure to seawater). Therefore, the minimum reduction in static modulus of elasticity, compressive, splitting and flexural strength was obtained for the HSFM mixes of hybrid fibers using steel fibers with palm fibers and also for the use of steel, palm, and Barchip fibers. 1. Introduction High-strength concrete or mortar subjected to axial compression is known to be a brittle material with almost no strain-softening behavior. Adding fibers to plain matrix has little or no effect on its precracking behavior but does substantially enhance its postcracking response, which leads to a greatly improved toughness and impact behavior [1]. Besides that, ductility in fiber reinforced cementitious composites is enhanced because fibers bridge crack surface and delay the onset of the extension of cracks [2]. Shah and Naaman [3] investigated tensile strength, flexural strength, and compressive strength tests on mortar specimens reinforced with steel fibers. It was observed that the tensile or flexural strength of steel fiber-reinforced mortar was at least two to three times higher than that of plain mortar. However, the addition of steel fibers at higher dosages has some disadvantages in terms of poor workability and higher cost. In addition, the high stiffness of steel fibers in the matrix means that voids and honeycombs could be formed during placing as a result of improper compaction at low workability. In order for good flow ability of mortar, the addition of two or three different fiber types can yield the optimum performance [4, 5]. Sustersic et al. [6] stated that the effect of corrosion of surface steel fibers is not detrimental to
Lightweight Aerated Concrete Incorporating Various Percentages of Slag and PFA
Noor Ahmed Memon,Salihuddin Radin Sumadi,Mahyuddin Ramli
Journal of Applied Sciences , 2006,
Abstract: The present experimental study evaluates the performance of lightweight aerated concrete incorporating various dosages of Ground Granulated Blast Furnace Slag (GGBFS) and Pulverized Fuel Ash (PFA) as partial cement replacement. Performance of the aerated concrete is investigated in terms of ultimate compressive strength, density and strength development. Eight mixes are developed and tested at the age of 7, and 28 days. Specimen were cured in water (initially for 14 days) and open air (at room temperature) to examine the effect of the curing regime. The results of the study show that the mixes produced by replacing cement with slag (GGBFS) and PFA are comparable with the mix without cement replacement. It is also observed from the study that the cement-slag-PFA based lightweight aerated concrete can be produced of adequate compressive strength and capable to apply as lightweight non-load bearing concrete units.
The Effect of Media Composition and Frequency of Liquid Organic Fertilization Provision on the Early Growth of White Turmeric (Curcuma alba L.)
Ramli
- , 2018, DOI: 10.4172/2376-0354.1000236
Abstract: Turmeric white is one of the potential medicinal plants for cultivated. Turmeric White has an important role in human life, such as useful for traditional medicine which can cure various kinds of diseases. The purpose of this research is to determine the effect of media composition and frequency of liquid organic fertilizer provision to the early growth of white turmeric plants. This research conducted in Mamboro sub-district, Palu Utara District, Central Sulawesi Province from July to September 2015, at an altitude of ± 25 meters above sea level. The research used Randomized Block Design (RAK) factorial pattern with two treatment factors repeated 3 (three) times. The first factor is a different media composition (M) consisting of 3 treatment levels, namely: M1: Soil M2: Soil + Sand, M3: Soil + Sand + Manure. Secondary frequency Frequency of liquid organic fertilizer (F) consisting of 4 treatment levels, namely: F1: 1 time, F2: 2 times, F3: 3 times, F4: 4 times, with concentration 10 cc / l Water. Each treatment was repeated 3 times so that there were 36 experimental units. The research results showed that the treatments of media composition, significantly effect on stem diameter, leaf width, and number of shoots aged of 12 WAP. The Frequency of liquid organic fertilizer gave a real effect on the plant’s height aged of 12 WAP. The interaction between the composition of the media and the frequency of organic liquid fertilizer gave a significant effect on plant height of 8 WAP and number of leaves aged of 12 WAP. The combination of soil + sand + cow manure and the provision of 4 times frequency of liquid organic fertilizer give better growth compared to other treatment combinations
ANALISIS VECTOR AUTO REGRESSIVE (VAR) TERHADAP KORELASI ANTARA BELANJA PUBLIK DAN PERTUMBUHAN EKONOMI DI SULAWESI SELATAN, TAHUN 1985-2005
Abustan Abustan,Mahyuddin Mahyuddin
- , 2009, DOI: https://doi.org/10.23917/jep.v10i1.805
Abstract: Vector Auto Regression (VAR) is an analysis or statistic method which can be used to predict time series variable and to analyst dynamic impact of disturbance factor in the variable system. In addition, VAR analysis is very useful to assess the interrelationship between economic variables. This research through the following test phases: unit root test, test of hypothesis, Granger causality test, and form a vector autoregresion model (VAR). The data used in this research is the GDP data and budget data of South Sulawesi in the period 1985-2004. The research aims to analyze the interrelationship between public expenditure and economic growth in South Sulawesi. The result showed statistically significant in economic growth (PDRB) influence public expenditure (APBD), however, not vice versa. Otherwise, for the need of APBD prediction, the used of lag 4 was the optimum model based on the causal relationship to PDRB
Relationship Between Chemical Component and In Vitro Digestibility of Tropical Grasses
PRAPTI MAHYUDDIN
HAYATI Journal of Biosciences , 2008,
Abstract: Fifty samples of leaf and stem of Sorghum stipodeum, Themeda australis, Iseilema vaginiflorum, Brachyacne convergens, and Dicanthium fecundum with different stage of maturity were used to study the relationship between their chemical components and in vitro dry matter digestibility (IVDMD). The IVDMD was performed by two stage of digestion; the first stage was digestion in rumen inoculum and the second stage was digestion of protein using neutral detergent solution. The relationship between chemical components and IVDMD was analysed using regression method. There was a negative correlation between fiber component [neutral detergent fiber (NDF), acid detergent fiber (ADF), and lignin] and a positive correlation between water soluble extract (WSE) or crude protein with IVDMD. Water soluble extract was the best predictor of IVDMD with r = 0.71 and residual standard deviation of 8.4 unit. Since the method of WSE is simple and inexpensive, it can be used as a predictor of dry matter digestibility of most forages. Although there were large variation exist among the species, however, the stage of maturity was an important factor affecting IVDMD showed in four out of five species tested. In two of the five species measured, the IVDMD were higher in leaf than that in stem.
Improvement of Murrah Buffalo Milk Production Fed Palm Oil Solid Waste Containing Ration
P. Mahyuddin
Media Peternakan , 2010,
Abstract: A field trial was conducted to study the effect of dietary inclusion of palm oil solid waste on milk production of murrah buffalo raised under palm oil plantation. Two farms from different districts were involved in this study. Forty cows with 7–9 month pregnancy were selected from each farm and they were divided into control and treatment groups. Cows in control group were offered a mixed supplement of 1 kg copra meal + 2 kg fresh grated cassava root + mineral mix and treatments group were offered the control diet + 1 kg palm oil solid waste. The dietary supplement was offered to the cows for 2 months before and 2 months period after calving. The cows were grazed under palm oil plantation. The addition of palm oil solid waste in the diet improved (P<0.05) milk yield (8.5 l/d vs 10.5 l /d), calves weight at birth (19.6 kg vs 22.1 kg) and live weight gain of the calves (0.66 kg/d vs 0.99 kg/d). Additional dietary inclusion of palm oil solid waste improved milk yield of murrah buffalo, and further improvement of milk yield was expected to achieve by higher inclusion of palm oil solid waste in the diet.
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