Using Job-­Site Test Results for Improving Concrete Quality

2014 ◽  
pp. 125-138
Keyword(s):  
Test Results ◽  
Concrete Quality ◽  
Job Site ◽  
Site Test

scholarly journals The Study of Interoperability Test for Onboard Control System in Railway Condition

2011 ◽  
Vol 2-3 ◽  
pp. 785-790
Author(s):  
Jong Hyen Baek ◽  
Yong Kyu Kim ◽  
Jae Ho Lee ◽  
Hyen Jung Jo
Keyword(s):  
Control System ◽  
Control Systems ◽  
Data Systems ◽  
Test Results ◽  
Simulation Environment ◽  
Train Control ◽  
Interoperability Test ◽  
Critical Characteristics ◽  
Site Test ◽  
Onboard Equipment

For the purpose of improving the future domestic train control systems and securing interoperability, according to the global development trends of train control systems, it is presented that the test results of interoperability between wayside train control systems installed in existed line, and the onboard train control system. Due to the safety-critical characteristics of train systems, the site test in the section where the wayside equipment is installed may lead to a danger against safety. Therefore, by way of constructing a simulation environment of train control systems, the T/R data systems of the equipment for interoperability are confirmed and the interoperability test are obtained by applying these systems to onboard equipment.

scholarly journals Estimation of compressive strength based on Pull-Out bond test results for on-site concrete quality control

2011 ◽  
Vol 4 (4) ◽  
pp. 582-591 ◽  
Author(s):  
M. S. Lorrain ◽  
M. P. Barbosa ◽  
L. C. P. Silva Fº
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Concrete Strength ◽  
Test Results ◽  
Compression Tests ◽  
Pull Out ◽  
Underlying Principle ◽  
Strength Based ◽  
Concrete Quality ◽  
Definition Of

Quality control of structural concrete has been conducted for several decades based mainly on the results of axial compression tests. This kind of test, although widely used, is not exempt from errors and has some considerable drawbacks that may affect its reliability, such as the need for appropriate and careful specimen conditioning and adoption of adequate capping techniques. For these reasons, it would be useful to have complementary or alternative ways to check compressive strength, in order to improve concrete quality control. The use of a bond test to monitor concrete strength is being proposed by an international group of researchers from France, Tunisia and Brazil as a potential means to this end. Given the fact that the link between bond resistance and concrete strength is already well established, this type of test seems to be a viable alternative to traditional methods. Nonetheless, to check if the underlying principle is sound when used in different circumstances, the group has been gathering data from several studies conducted by different researchers in various countries, with distinct concretes and rebar types. An analysis of the data collected shows that there is a clear and strong correlation between bond resistance and compressive strength, no matter the influence of other variables. This result validates the basic idea of using an Appropriate Pull-Out (APULOT) bond test to assess concrete strength. If the general principle is valid for random data obtained from different studies, the definition of a clear and appropriate test will probably lead to the reduction of experimental noise and increase the precision of the strength estimates obtained using this method.

scholarly journals Evaluation of the Effects of Coarse Aggregate Sizes on Concrete Quality

2017 ◽  
Vol 2 (10) ◽  
pp. 1 ◽  
Author(s):  
Lawrence Echefulechukwu Obi
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Aggregate Size ◽  
Test Results ◽  
Construction Sites ◽  
Coarse Aggregates ◽  
Appreciable Increase ◽  
Concrete Production ◽  
Concrete Quality

This work was necessitated by the observations made at construction sites where artisans and craftsmen were left alone in concrete production. It was discovered that they used inadequate quantity and size of coarse aggregates due to difficulty associated in the mixing as if the coarse aggregates were not needed in concrete production. The research has established that the coarse aggregates and their sizes play critical roles in the development of adequate strength in concrete. It was observed that with proper mixing, the slump test results did not witness shear or collapse type of slump rather there were true slump in all cases of the test. The workability decreased with slight differences when the coarse aggregate size was increased. The increase in the coarse aggregates yielded appreciable increase in the compressive strength. It can therefore be inferred that the quality of concrete in terms of strength can be enhanced through an increase in the coarse aggregate size when proper mix ratio, batching, mixing, transporting, placing and finishings are employed in concrete productions.

Study on Crack Spacing and Width of Expansive Soil due to Evaporation

2013 ◽  
Vol 690-693 ◽  
pp. 728-733 ◽  
Author(s):  
Jun Hua Wu ◽  
Song Yang
Keyword(s):  
Expansive Soil ◽  
Crack Spacing ◽  
Force Balance ◽  
Soil Parameters ◽  
Test Results ◽  
Maximum Width ◽  
Site Test ◽  
Final Characteristic

The expressions of crack spacing and width were deduced from the aspect of force-balance. The concept of maximum spacing and width of crack were put forward accordingly and they were verified and consistent with the site test results. Their relationships with soil parameters were discussed in detail. The new cracks do not appear until the spacing of adjacent cracks is greater than the maximum spacing, and the width of cracks will not be greater than the maximum width. The maximum spacing and width are judgments for describing and represent the final characteristic of cracks due to evaporation.

Relationship between Test Results of the ACSIRO and ASTM C1202 Methods

2006 ◽  
Vol 302-303 ◽  
pp. 567-571 ◽  
Author(s):  
Wei Wen Li ◽  
Fa Guang Leng ◽  
Xiong Zhou Yuan
Keyword(s):  
Standard Test ◽  
Total Charge ◽  
Test Results ◽  
Additional Test ◽  
Simple Modification ◽  
Concrete Quality ◽  
The Difference ◽  
Astm C1202 ◽  
The Relationship

The ASTM C1202 method is observed that the total electric charge passed is not an ideal indicator for classification of concrete quality when different binders are considered. Considering the drawback of the ASTM 1202 method, a simple modification to the ASTM C1202 method is recommended. The modification involves an additional test using curing water as electrolyze solution. The difference in the total charge passed obtained between standard test and test performed in curing water is suggested as an indicator for concrete quality. The test results show that there exists a good correlation between the ACSIRO and the ASTM C1202 methods. The relationship can be formulated as a linear function.

Evaluation of a Human On-site Urine Multidrug Test for Emergency Use With Dogs

2009 ◽  
Vol 45 (2) ◽  
pp. 59-66 ◽  
Author(s):  
Joan B. Teitler
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Illicit Drugs ◽  
Gas Chromatography Mass Spectrometry ◽  
Professional Judgment ◽  
Test Results ◽  
Clinical Consideration ◽  
Drug Classes ◽  
Test Kit ◽  
Site Test

A rapid, human on-site urine multidrug test was used to screen canine urine samples for the presence of five illegal drugs and drugs from three commonly abused drug classes. Each sample was sent to a toxicology laboratory for gas chromatography/mass spectrometry (GC/MS) validation. On-site test results and GC/MS assays confirmed that the human on-site test kit did identify barbiturates, opiates, benzodiazepines, and amphetamines/methamphetamines in urine from dogs that had received these common illicit drugs/drug classes either intravenously and/or orally. However, neither the on-site test kit nor the GC/MS individual assays for marijuana or methadone, a synthetic opiate, were effective in identifying marijuana and methadone in urine from dogs with suspected or known exposure. No index of suspicion was seen for exposure to phencyclidines or cocaine during the study period, and no exposures were indicated by the on-site test results. Overall, the test is a rapid, readily available, affordable, and useful complement to the veterinarian’s clinical consideration and professional judgment.

Field Investigation of Influences of Load on Pile Top on Negative Skin Friction Behaviors

2011 ◽  
Vol 243-249 ◽  
pp. 2138-2142
Author(s):  
Li Nong Xia ◽  
Yun Dong Miao ◽  
Shun Li ◽  
Xin Tong
Keyword(s):  
Skin Friction ◽  
Applied Load ◽  
Field Investigation ◽  
Neutral Point ◽  
Test Results ◽  
Negative Skin Friction ◽  
Field Investigations ◽  
Site Test ◽  
Made In

In order to study influences of applied load on pile top on the negative skin friction behaviors of piles, field investigations of negative skin friction behaviors of three identical piles with different loads on pile top are made in the same site. Test results show that applied load on pile top affects negative skin friction behaviors evidently. Additional settlement of pile induced by negative skin friction becomes larger, negative skin friction induced by the settlement of soil surrounding the pile becomes smaller with the increase of load on pile top. Dragload induced by negative skin friction decreases and position of neutral point in pile moves up while applied load on pile top increases. While there is no applied load on pile top, additional settlement induced by negative skin friction is minimum, dragload induced by negative skin friction is maximum and the neutral point is the farthest from the top of piles. The field investigation results may be useful to the further research for negative skin friction behaviors of pile.

scholarly journals Analisa Agregat Halus Pasir Zona III Dengan Agregat Kasar Ukuran 20 mm Dan 40 mm Untuk Uji Kuat Tekan Mutu Beton Pada Campuran Beton Normal

2018 ◽  
Vol 1 (1) ◽  
pp. 11 ◽  
Author(s):  
Nasir Bumulo ◽  
Nur Windawaty Rusnadin
Keyword(s):  
Compressive Strength ◽  
Construction Material ◽  
Control Variable ◽  
Fine Aggregate ◽  
Test Results ◽  
Testing Method ◽  
A Value ◽  
Concrete Quality ◽  
Independent Variable ◽  
Sand Material

Concrete is a construction material that is widely used in building structutre work in indonesia becouse it has many benefits. Its compactness and cooperation arragement is very influential toward the compressive strength. One factor is the compectness of concrete fine aggregate and coarse aggregate. The aim of this research was to find out compessive strength of concrete at 28 days using sand material zone III with pebbles the size of 20 mm and 40 mm in a normal concrete mix.The reseach was using the quantitaive testing method. The independent variable of this research was the composition of the mixture, and dependent variable was in the form of concrete quality. The control variable was the material being used. The data collection was done by conducting laboratory testing based on SNI and PBI. The data analysis was done by calculating the average of the test results are then compered with SNI and PBI.The result of concrete research with sand material of zone III and gravel of 20 mm and 40 mm was observed at 28 days old showed a compressive strength value of 311,89 Kg / cm2. Then the concrete sample with sand material of zone III and pebble size 40 mm shows the value of compressive strength of 334,46 Kg / cm2. From this result, it can be concluded that the mixture of sand zone III with gravel measuring 40 mm has a value of concrete compressive strength greater than 20 mm.

The Solution of a Vibration Problem on a Turbine-Compressor Set Mounted on a Steel Foundation

1977 ◽  
Vol 191 (1) ◽  
pp. 135-145
Author(s):  
J.N. Ramsden ◽  
J.R. Stoker
Keyword(s):  
Theoretical Model ◽  
Test Results ◽  
Vibration Level ◽  
Sufficient Detail ◽  
Speed Range ◽  
Central Column ◽  
Vibration Pattern ◽  
Site Test ◽  
Considerable Detail ◽  
Foundation Structure

The paper describes a vibration investigation undertaken as part of the commissioning of a 12 M.V. steam-turbine driven blower. The set which was mounted on a flexible steel foundation. suffered severe vibration of the exhaust-end pedestal of the turbine. Early attempts to cure the vibration had failed. To avoid further delays it was decided to make a theoretical model of the machine and its foundation and to develop this until it agreed with measurements taken at site. Having proved the theoretical model it was then to be used to try out suggested modifications to the foundation to see if a solution could be found. The first stage of the work was to make site measurements of the machine's vibration pattern over the speed range of the machine. Recordings were made and analysed of the motion of various points on the shaft, bearing housings, casings and supporting structure in sufficient detail to demonstrate the validity of the theoretical model's predictions. The theoretical model used finite element techniques to model the shaft and the foundation structure. The shaft, mounted via hydrodynamically-lubricated bearings in the structure, was spun over the speed range of the machine and the response to unbalance of the shaft and structure computed. It was found that considerable detail was required in the idealisation before the predictions finally agreed with the site test results. When this agreement was obtained a modification involving a central column under the centre bearing pedestal was put into the theoretical model. It was predicted that this modification would reduce the peak vibration by 78 percent. When the real column was fitted to the foundation the vibration level was found to have been reduced by 75 percent.

Cost Comparison of Traditional Glass Fiber Test Methods and Computer Aided Neural Prediction Supported Systems

2018 ◽  
Author(s):  
SADIK ALPER YILDIZEL ◽  
SERDAR CARBAS ◽  
OSMAN TUNCA
Keyword(s):  
Neural Networks ◽  
Reinforced Concrete ◽  
Glass Fiber ◽  
Fiber Reinforced Concrete ◽  
Test Results ◽  
Fiber Reinforced ◽  
Proportional Limit ◽  
Glass Fiber Reinforced ◽  
Computer Aided ◽  
Site Test

Within the complexity of the industrial production strategies, computer aided technologies have been becoming a survival key for company administrators for reducing expenses. Furthermore, new production methods and adaptation of dynamic market requirements force owners to apply computer aided solutions to reduce to production time of goods to the market. Nowadays, prefabricated concrete producers are facing the same problem and trying to apply new solutions to overcome these high costs. In this research, artificial neural networks and traditional glass fiber testing methods were compared to reduce the quality control and assurance processes of prefabricated glass fiber reinforced concrete (GRC) production. 143 different four-point flexural test results of glass fiber reinforced concrete mixes with the varied parameters as temperature, fiber content and slump values were introduced the artificial neural networks models. The proportional limit properties (LOP) of glass fiber reinforced concrete and trained neural network analysis are taken into consideration for comparison. The outcomes of the analysis reflected that there is a strong correlation between the proportional limit of glass fiber reinforced concrete on-site test and the artificial swarm-based optimization algorithm results. Depending on this secure data, on-site test quantities are reduced and checked for cost deduction of traditional test results.

Sign in / Sign up

Export Citation Format

Share Document