Los Angeles Abrasion Test on Aggregates -Values for Pavements and Roads
With this value, you can also validate if your system meets the maximum bus capacitance allowed by the specification. Maximum resistance After you get the capacitance, you can plug the capacitance back in the equation to get the maximum resistor values for your system. R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady-state conditions. The R-value is the building industry term for thermal resistance "per unit area." It is sometimes denoted RSI-value if the SI (metric) units are used.
Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When you join you get additional benefits. By registering, you agree to the Terms of Service and Privacy Fhe. Lost your valje Please enter your email address. You will receive a link and will create a new password via email. Sorry, you do not have permission to ask a question, You must log in to ask a question. Become VIP Member. Do you need to remove the ads? Los Angeles abrasion test on aggregates is the measure of aggregate toughness and abrasion resistance such as valie, degradation and disintegration.
The aggregate used in surface course of the highway vapue are subjected to wearing due to movement of traffic. When vehicles move on the road, the soil particles present what do you wear to a college graduation the pneumatic tyres and road surface cause abrasion of road aggregates.
The steel rimmed wheels of animal driven vehicles also cause considerable abrasion of the road surface. What is the value of resistance, the road aggregates should be hard enough to resist abrasion.
Resistance to abrasion of aggregate is determined in laboratory by Los Angeles test machine. The principle of Los Angeles abrasion test is to produce abrasive action by use of standard steel balls which when mixed with aggregates and rotated resistanxe a drum for specific number of revolutions also causes impact on aggregates.
The percentage wear of the aggregates due to rubbing with steel balls is determined and is known as Los Angeles Abrasion Value. The sample should conform to any of the gradings shown in table 1.
Los Angeles test is commonly used to evaluate the hardness of aggregates. The test has more acceptability because the resistance to abrasion and impact is determined simultaneously. Depending upon the value, the suitability of aggregates for different road constructions can be eesistance as per IRC specifications as given:. Join Join TheConstructor to ask questions, answer questions, write articles, reeistance connect with other people. Have an account? Log in Now. Join for free or log in to continue reading Remember Me!
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The calculator does not go to 3 spots after the decimal and therefore, shows / 3 = > (resistor value) / 3 (number of resistors) = [parallel resistance value] With multiple resistors of the same value this is all you need to do to know the parallel resistance: Know the value of the resistor (R) Know how many resistors you are using (N) read the output (x) Here is the. Pitting resistance equivalent number (PREN) is a predictive measurement of a stainless steel's resistance to localized pitting corrosion based on its chemical composition. In general: the higher PREN-value, the more resistant is the stainless steel to localized pitting corrosion by chloride. It indicates that the connected resistance is too high to measure on the selected scale. If you plug in the leads but don't connect them to anything then the resistance is (as far as the meter is concerned) pretty much infinite, which it shows with the 1 in the left most digit.
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.
It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have a brand new multimeter, but any time I set it to resistance mode any setting according to the user manual, it shows 1 in the leftmost digit, and the decimal point will move around based on which setting I chose but the remaining digits will never set to 0.
The output does not change when I connect the leads to opposite ends of a resistor. If you plug in the leads but don't connect them to anything then the resistance is as far as the meter is concerned pretty much infinite, which it shows with the 1 in the left most digit.
Connect the leads to the proper jacks sounds like you have, red to the Volts and Ohms jack and black to the Common and short the ends of the probes together. You should get a value very near zero. If you don't get that zero reading then post a picture of your meter as you short the leads together showing the meter and its settings, the connections of the leads and how you shorted them. You may be doing something wrong. If everything looks good, you may have a bad lead or a meter with a bad jack.
More likely, though, is that you are doing something simple wrong. From the answer you've now posted, it appears you were doing something simple the wrong way. An incorrectly connected lead is an operator error. Seems Icy found the issue. The positive lead wasn't fully connected, yet the other modes were giving some output.
After that, if I put the very bottom of the leads together, I get a reading close to 0. I also tried a ohm resistor, and after a moment it picked it up and read. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why does my multimeter always show a value of 1 for resistance? Ask Question. Asked 5 years, 6 months ago. Active 1 month ago. Viewed 34k times. Am I doing it wrong, or is my meter defective? Improve this question. Ambo 5 5 bronze badges. If you try to measure large resistor in small range, it will end up showing the same 1 in left corner, I suppose.
The meter should read 0, or close to 0 i. It could be the leads. Are they fully pushed into the connectors? Show 1 more comment. Active Oldest Votes. It indicates that the connected resistance is too high to measure on the selected scale. Improve this answer. I was also fairly certain it was me doing something wrong.
All good to go now. Add a comment. Normally it will also flash the battery low symbol when that happens but only flash it on the ohmmeter scale.
On a DMM with no or broken battery indicator, it might be hard to figure out when this is happening. The Overflow Blog. Podcast Non-fungible Talking. Featured on Meta. New onboarding for review queues. Linked 1. Related 6. Hot Network Questions. Question feed. Accept all cookies Customize settings.