1,721,005 research outputs found
Assessing impact of instruction on spatial ability among Malaysian engineering students
Get PDFSpatial ability across gender was examined among the first year engineering students in a Malaysian university. A sample of one hundred and eighty four participants, with a balanced ratio of male and female students, were recruited using stratified random sampling. In this study, participants were asked to complete a spatial ability test at their best in one hour. The test was adopted from Purdue Spatial Visualization Test: Rotations (PSVT:R) and the Mental Cutting Test (MCT). In addition, by using another set of comparable spatial ability test, the impact of instruction was measured. The results support many of the findings in previous research that males significantly outperformed females in spatial ability. However, there was no significant difference found between students' spatial scores and their entry qualifications. Results of this study also reveal an interesting finding on the significant effect of instruction in improving the spatial ability of engineering students. © Common Ground, Mohamad Raduan Kabit, Norehan Zulkiply, Aidil Azli Alias, Wan Hashim Wan Ibrahim, Resdiansyah Mansyur, Ron Aldrino Chan, All Rights Reserved, Permissions
Accreditation Handbook
Get PDFThis handbook is a reference for the faculty, academic and administrative staff on the process and procedure involved in preparing and obtaining accreditation. This handbook also serves as a valuable guide for the faculty to develop an assessment plan in the process of the future accreditation
Basic and Grade Stress for Some Timber in Sarawak
Get PDFStrength properties’ tests are conducted in the small clear sample. This paper aim to acquire the basic and grade stresses of some fast growing species thus identifies its strength group. Thus, the information of wood properties from different species and condition are acquired from strength property's test. The required information namely, bending parallel to the grain, compression stress parallel to grain, shear parallel to grain and modulus of elasticity. The condition of the trees which is referred to green and air-dry condition. Three different species which are referred to exotic species of Acacia mangium and indigenous species of Aras. The results from the study indicated that, Acacia mangium classified under the strength group SG5, whilst Aras was classified under the strength group SG7. The timber is of medium density Light Harwood ranging from 0.37-0.52g/cm3 air-dry condition
Evaluation of Acacia Mangium in Structural Size at Green Condition
Get PDFAcacia mangium is one of the most popular choices in the reforestation and rehabilitation of abandoned shifting cultivation areas dated back to the 70’s. This paper looks into the evaluation of mechanical strength and physical properties in structural size at green condition for Acacia mangium. The mechanical strength properties tests were referred to the modulus of rupture, modulus of elasticity and tensile strength. Meanwhile, physical properties determination referred to basic density and moisture content. At green condition, Acacia mangium had been identified under the strength group SG6. It was found that strength value of modulus of rupture was higher than the
tensile strength value with 44% stronger in bending compared to in tension. At the structural size, the mean value for moisture content and basic density at green condition were reported with 73.03% and 0.54g/cm3 respectively
The Behavior of Strength Properties from Three Different Tree Boles of Aras in Sarawak
Get PDFAras had been selected and tested in small clear specimens. Sampling of test specimens are made from three sections of the tree bole namely from bottom, middle, and top parts. This paper looks into the information of strength properties from three sections of sampled. The strength properties test required are the modulus of rupture, modulus of elasticity and compression stress parallel to grain. Meanwhile, the physical properties' test referred to moisture content and basic density. The testing conducted in two different conditions of the trees, which were referred to green and air-dry condition. It was found that the average mean values for modulus of rupture, modulus of elasticity and compressive stress parallel to grain tested at green condition were 47.52N/mm2, 6358.56N/mm2 and 22.42N/mm2 respectively meanwhile at air-dry condition were 70.49N/mm2, 8217.64N/mm2 and 34.07N/mm2 respectively. Meanwhile, the average mean values for moisture content at green condition were 83.34% whilst at the air-dry condition were 12.33%. Basic density remains unchanged from both conditions
MODIFIED CEMENT SYSTEM: DURABILITY AND AESTHETICS
Get PDFConcrete deterioration is one of the most concerning matters in the construction world. Significant decay such as efflorescence should not be ignored. The efflorescence is a deposit of salts, usually white, formed on the surface of the concrete. The efflorescence is not a significant problem that leads to structural defects, but it can build unattractiveness to the structure, such as brick walls and concrete mortar. The way to prevent the efflorescence occurrence is by studying the results of testing such as absorption and efflorescence itself to reduce the efflorescence. The non-modified cement system can reduce efflorescence but cannot avoid it because of the reaction of cement hydration itself. This study proves that using a modified cement system such as Pulverized Fly Ash (PFA) and Polymers (water-based latex grade 29Y46), the efflorescence of the mortar can be prevented. This study proved that the modified mortar, a sample with PFA and Polymers, has higher strength, durability, and minor efflorescence than the non-modified cement system
STRENGTH AND DURABILITY EFFECT ON STABILIZED SUBGRADE SOIL
Get PDFThis paper presents the development of strength and durability effect of stabilized soil. The clayey soil collected from Kota Samarahan, Sarawak was admixed with cement, fly ash and rubberchip as an additive for stabilization purposes. The optimum mixture determined was then used as a recommendation for the design guidelines of subgrade based on JKR Standard Specification for Road Works. The stabilized clay specimens were prepared with 5%
cement and various fly ash and rubber chips contents, of 5%, 10% and 15%, respectively. The specimens were then
cured for 7 and 28 days before subjected to Unconfined Compressive Strength (UCS) tests and California Bearing
Ratio (CBR) tests. As observed, the stabilization improved the strength and stiffness of the soil properties
significantly. However, the addition of 15% rubberchip shows a reduction in strength for both 7 and 28 days curing
period. From the study, the optimum mixture, which fulfilled the JKR Standard Specification was the mixture of
5% cement and 15% fly ash. However, the mixture of 5% cement and 10% rubberchip is also recommended to be used as an alternative to stabilize the subgrade for low volume road
STRENGTH CHARACTERISTICS OF MORTAR CONTAINING DIFFERENT SIZES GLASS POWDER
Get PDFA greater portion of nonrecyclable waste glass is accumulated on landfills creating a serious environmental problem. Recent studies have been carried out to utilize the waste glass in construction as partial replacement of cement. This paper investigates the fineness properties of four sizes glass particles and strength characteristics of mortar in which cement is partially replaced with glass powder in the replacement level with 10%, 20%, 30% and 40%. Mortar cubes containing with varying particle sizes in the ranges of 212 µm, 75 µm, 63-38 µm and lower than 38 µm and in a water to cement ratio 0f 0.50 and 0.45 have been prepared. Room temperature and relative humidity have been maintained 32ºC and 90% respectively during the curing process. Replacement of 10% cement with glass powder reveals the higher compressive strength at 28days than other levels of replacement. The reduction in compressive strength increases with the level of cement replacement
Laboratory study of water absorption of modified mortar.
Get PDFThis study investigates the effects of polymer additives namely polyvinyl acetate (PVAc) on water absorption and compressive strength of mortar. Twelve mortar mixtures were investigated for water absorption test and compressive strength test. Results showed that water absorption were inversely proportional to the percentage of PVAc addition. Final analysis showed that addition of PVAc had significant effects on water absorption. Samples with 1%, 3% and 5% addition of PVAc showed an increase of water absorption capacity in comparison to control mortar
Effect of PFA on strength and water absorption of mortar.
Get PDFPartial replacement of cement by mineral admixtures or pozzolans can possibly improve the durability of mortar which directly related to its water absorption. Pulverized Fuel Ash (PFA) is one of the pozzolans that is locally available. Laboratory studies have been conducted on mortar mixes of 0.3w/c, 0.4w/c and 0.5w/c ratios with 10%, 20% and 30% PFA replacements. Mortar cubes were tested to determine their water absorption rates and compressive strengths as they mature. Amount of PFA replacements in the mortar has significant effects on the strength development and water absorption rate of the mortar. Results shows that 20% PFA mortars of 0.5w/c ratio is the best mix to reduced rate of water absorption and achieved higher compressive strength
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