Strength Properties Of Oil Palm Clinker Concrete

1986 ◽  
pp. 28-37 ◽  
Author(s):  
Mat Lazim Zakaria
Keyword(s):  
Oil Palm ◽  
Lightweight Aggregate ◽  
Strength Properties ◽  
Term Strength ◽  
Test Results ◽  
Short Term ◽  
Research Project ◽  
Sulphate Content ◽  
Aggregate Concrete ◽  
Short Term Strength

Tire paper summarises the results of a research project on the utilization of oil palm clinker as lightweight aggregate in concrete. Oil palm clinker is a waste by-product in an oil palm processing mill.The test results indicate that the short-term strength properties of oil palrn clinker concrete are about the same as the properties of normal aggregate concrete. The advamage is it's weight reduced by 20%. The disadvantage is oil palm clinker has a high percentage of sulphate content.

scholarly journals Characterization of Short-Term Strength Properties of Fiber/Cement-Modified Slurry

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Ping Jiang ◽  
Tianhao Mao ◽  
Na Li ◽  
Liang Jia ◽  
Fang Zhang ◽  
...  
Keyword(s):  
Cement Content ◽  
Back Propagation ◽  
Strength Properties ◽  
Term Strength ◽  
Compression Tests ◽  
Short Term ◽  
Accuracy Requirement ◽  
Strength Failure ◽  
Short Term Strength ◽  
Neural Network Algorithm

The recycling of construction waste slurry is an urgent issue that needs to be solved in urban construction. To satisfy the requirements of subgrade filling, mechanical properties of fiber/cement-modified slurry were investigated. Unconfined compression tests were conducted for 7-day-cured specimens with a cement content of 5%, 10%, 15%, 20%, 25%, and 30%, respectively. Moreover, the effects of fiber contents (0.25%, 0.5%, 0.75%, and 1%, respectively) were also investigated for the specimens with a cement content of 20%. A formula satisfying the accuracy requirement was obtained by fitting the stress-strain curves using the back propagation (BP) neural network algorithm. Five parameters, including peak strength, failure strain, initial elastic modulus, residual strength, and energy dissipation, were used to characterize the short-term strength properties of fiber/cement-modified slurry. The analysis revealed that the cement content had a dominant effect on the short-term strength properties of fiber/cement-modified slurry, while the influence of fiber content was insignificant.

Effects of Training Loads on Short-term Strength Adaptations in Older Adults

2011 ◽  
Vol 43 (Suppl 1) ◽  
pp. 516
Author(s):  
Sandor Dorgo ◽  
Rebecca J. Reed-Jones ◽  
Chantal A. Vella ◽  
Christina Samples ◽  
Chandrasekhar Bulusu
Keyword(s):  
Older Adults ◽  
Term Strength ◽  
Short Term ◽  
Short Term Strength

SUBSTANTIATION OF THE SPECIFIC CRITERION FOR THE CORROSIVE EFFECT OF FORMATION MEDIA ON THE CYCLIC STRENGTH OF STEEL OF DOWNHOLE EQUIPMENT

2020 ◽  
pp. 60-64
Author(s):  
E.S. Yushin
Keyword(s):  
Approximate Calculation ◽  
Oil And Gas ◽  
Endurance Limit ◽  
Cyclic Strength ◽  
Cyclic Loads ◽  
Term Strength ◽  
Short Term ◽  
Specific Criterion ◽  
Corrosive Effect ◽  
Short Term Strength

The article provides the substantiation of the specific coefficient of corrosion influence, considered per unit of the limit of short-term strength of the metal, with the help of which it is possible to simplify the most approximate calculation of the limited endurance limit of steels of oil and gas equipment operating under cyclic loads, as well as perform subsequent resource calculations.

scholarly journals Strength exercise reduces hepatic pyruvate carboxylase and gluconeogenesis in DIO mice

2020 ◽  
Vol 247 (2) ◽  
pp. 127-138
Author(s):  
Rodrigo Martins Pereira ◽  
Kellen Cristina da Cruz Rodrigues ◽  
Marcella Ramos Sant’Ana ◽  
Guilherme Francisco Peruca ◽  
Ana Paula Morelli ◽  
...  
Keyword(s):  
Strength Training ◽  
Pyruvate Carboxylase ◽  
Hepatic Glucose Production ◽  
Glucose Production ◽  
Mrna Levels ◽  
Strength Exercise ◽  
Term Strength ◽  
Short Term ◽  
Hepatic Glucose ◽  
Short Term Strength

Obesity is linked to a reduction in the control of hepatic glucose production, which is the primary mechanism related to fasting hyperglycemia and the development of type 2 diabetes mellitus (T2DM). The main system involved in hepatic gluconeogenesis synthesis is controlled by pyruvate carboxylase (PC), which increases in obesity conditions. Recently, we showed that short-term strength training is an important tool against obesity-induced hyperglycemia. As aerobic exercise can reduce the hepatic PC content of obese animals, we hypothesized that strength exercise can also decrease this gluconeogenic enzyme. Therefore, this study investigated whether the metabolic benefits promoted by short-term strength training are related to changes in hepatic PC content. Swiss mice were divided into three groups: lean control (Ctl), obese sedentary (ObS), and obese short-term strength training (STST). The STST protocol was performed through one session/day for 15 days. The obese exercised animals had reduced hyperglycemia and insulin resistance. These results were related to better control of hepatic glucose production and hepatic insulin sensitivity. Our bioinformatics analysis showed that hepatic PC mRNA levels have positive correlations with glucose levels and adiposity, and negative correlations with locomotor activity and muscle mass. We also found that hepatic mRNA levels are related to lipogenic markers in the liver. Finally, we observed that the obese animals had an increased hepatic PC level; however, STST was efficient in reducing its amount. In conclusion, we provide insights into new biomolecular mechanisms by showing how STST is an efficient tool against obesity-related hyperglycemia and T2DM, even without body weight changes.

scholarly journals Short-term strength training reduces gluconeogenesis and NAFLD in obese mice

2019 ◽  
Vol 241 (1) ◽  
pp. 59-70 ◽  
Author(s):  
Rodrigo Martins Pereira ◽  
Kellen Cristina da Cruz Rodrigues ◽  
Chadi Pellegrini Anaruma ◽  
Marcella Ramos Sant’Ana ◽  
Thaís Dantis Pereira de Campos ◽  
...  
Keyword(s):  
Weight Loss ◽  
Insulin Sensitivity ◽  
Strength Training ◽  
Term Strength ◽  
Obese Mice ◽  
Short Term ◽  
Fat Accumulation ◽  
Hepatic Insulin Sensitivity ◽  
Short Term Strength ◽  
Hepatic Fat

Non-alcoholic fatty liver disease (NAFLD) has a positive correlation with obesity, insulin resistance and type 2 diabetes mellitus (T2D). The aerobic training is an important tool in combating NAFLD. However, no studies have demonstrated the molecular effects of short-term strength training on the accumulation of hepatic fat in obese mice. This study aimed to investigate the effects of short-term strength training on the mechanisms of oxidation and lipid synthesis in the liver of obese mice. The short duration protocol was used to avoid changing the amount of adipose tissue. Swiss mice were separated into three groups: lean control (CTL), sedentary obese (OB) and strength training obese (STO). The obese groups were fed a high-fat diet (HFD) and the STO group performed the strength training protocol 1 session/day for 15 days. The short-term strength training reduced hepatic fat accumulation, increasing hepatic insulin sensitivity and controlling hepatic glucose production. The obese animals increased the mRNA of lipogenic genes Fasn and Scd1 and reduced the oxidative genes Cpt1a and Ppara. On the other hand, the STO group presented the opposite results. Finally, the obese animals presented higher levels of lipogenic proteins (ACC and FAS) and proinflammatory cytokines (TNF-α and IL-1β), but the short-term strength training was efficient in reducing this condition, regardless of body weight loss. In conclusion, there was a reduction of obesity-related hepatic lipogenesis and inflammation after short-term strength training, independent of weight loss, leading to improvements in hepatic insulin sensitivity and glycemic homeostasis in obese mice. Key points: (1) Short-term strength training (STST) reduced fat accumulation and inflammation in the liver; (2) Hepatic insulin sensitivity and HPG control were increased with STST; (3) The content and activity of ACC and content of FAS were reduced with STST; (4) STST improved hepatic fat accumulation and glycemic homeostasis; (5) STST effects were observed independently of body weight change.

scholarly journals Flexural Capacity and Deflection of Fiber-Reinforced Lightweight Aggregate Concrete Beams Reinforced with GFRP Bars

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 873 ◽  
Author(s):  
Xi Liu ◽  
Yijia Sun ◽  
Tao Wu
Keyword(s):  
Lightweight Aggregate ◽  
Reinforcement Ratio ◽  
Steel Fibers ◽  
Lightweight Aggregate Concrete ◽  
Fiber Reinforced ◽  
Flexural Capacity ◽  
Short Term ◽  
Aggregate Concrete ◽  
Reinforced Polymer ◽  
Stiffness Model

Adding fibers is highly effective to enhance the deflection and ductility of fiber-reinforced polymer (FRP)-reinforced beams. In this study, the stress and strain conditions of FRP-reinforced lightweight aggregate concrete (LWC) beams with and without fibers at ultimate load level were specified. Based on the sectional analyses, alternative equations to predict the balanced reinforcement ratio and flexural capacity for beams failed by balanced failure and concrete crushing were established. A rational equation for estimating the short-term stiffness of FRP–LWC beams at service-load levels was suggested based on Zhu’s model. In addition, the contribution of the steel fibers on the short-term stiffness was quantified incorporating the effects of FRP reinforcement ratio. The proposed short-term stiffness model was validated with measured deflections from an experimental database for fiber-reinforced normal weight concrete (FNWC) beams reinforced with FRP bars. Furthermore, six glass fiber-reinforced polymer (GFRP)-reinforced LWC beams with and without steel fibers were tested under four-point bending. Based on the test results, the proposed models and procedures according to current design codes ACI 440.1R, ISIS-M03, GB 50608, and CSA S806 were linked together by comparing their predictions. The results showed that increasing the reinforcement ratio and adding steel fibers decreased the strain of the FRP bars. The flexural capacity of the LWC beams with and without steel fibers was generally underestimated by the design codes, while the proposed model provided accurate ultimate moment predictions. Moreover, the proposed short-term stiffness model yielded reasonable estimations of deflection for both steel fiber-reinforced lightweight aggregate concrete (SFLWC) and FNWC beams.

scholarly journals Properties of oil palm shell lightweight aggregate concrete containing fly ash as partial cement replacement

2020 ◽  
Vol 849 ◽  
pp. 012048
Author(s):  
Khairunisa Muthusamy ◽  
Mohamad Safwan Jaafar ◽  
Nili Wahida Azhar ◽  
Nurazzimah Zamri ◽  
Nadiah Samsuddin ◽  
...  
Keyword(s):  
Fly Ash ◽  
Oil Palm ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Cement Replacement ◽  
Palm Shell ◽  
Oil Palm Shell ◽  
Partial Cement Replacement
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