Technical - Moisture testing

The plastic sheet method for measuring moisture in concrete.

Is this an effective way to determine concrete slab moisture problems? Check the testing video:

Same with rubber mat:

How to test moisture / RH (Relative Humidity) content in cementitious substrate / wood / gypsum boards / plaster boards using authorized tools and standards as per ASTM F 2420 & F 2170_Moisture testing machine - Delmhorst 2100

This video shows you how to do the Calcium Chloride (or ASTM F 1869-04) test. This is a test for measuring moisture emitted from the surface of concrete.

The removable Rapid RH^® Easy Reader with our patented Touch-n-Sense™ technology allows you to take repeated readings from any Smart Sensor quickly and easily as per ASTM F2170:

• Testing the moisture as per AASHTO T 217
 
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• ASTM D4944
 
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• FLORIDA FM5-507 - This is applicable for the materials which are collected from the site Or taken out from the place.

The Gilson Aqua-Check Moisture Tester is made in the USA, and offers an affordable choice for rapid, accurate and reliable moisture tests on sand, aggregates, ores, coal, soils and other materials with particle size up to 20mm. Samples can be quickly tested on-site, eliminating delay and risk of moisture loss during transport. Portable units are easy to use, and meet ASTM, AASHTO and Florida DOT requirements.

A pre-weighed 20g sample is placed in the test cell, along with a measured quantity of calcium carbide reagent. When the cell is sealed and agitated for one to three minutes, free moisture in the test sample reacts with the reagent to produce acetylene gas. The integral pressure gauge registers 0—20% moisture by weight in 0.2% graduations. Moisture range can be doubled by halving the pre-weighed sample weight.

The MA-26X Aqua-Check has a rugged, die-cast aluminum body with a tough, wear-resistant coating and includes a 0—20 % pressure gauge, with a certificate of calibration. Models are also supplied with an electronic digital balance, two 1.25in (32mm) dia. steel pulverizing balls, reagent measuring scoop, brush and instructions in a heavy-duty, waterproof plastic case.

Let see how to test Calcium Chloride ASTM F1869:

AS1884-2012 Floor coverings—Resilient sheet and tiles—Installation practices: No underlay or floor covering shall be laid on the subfloor until the conditioning units have been in operation at the expected operating temperature & humidity levels for at least 7 days. During this period the temperature and humidity shall not be allowed to fall outside the recommended limits of the manufacturer of the floor covering. These conditions shall be maintained during laying and for 48 hours thereafter.

the older AS1884 with removal of the 5.5% moisture content measured with an electrical probe, and relegation of the surface relative humidity test and 70% RH to a lesser option. Research showed that when the surface was covered over with impervious flooring, moisture rose from below to restore equilibrium rendering surface measurements less reliable. It was found that 5.5% moisture content equalled 85%+ RH, and 70% RH at the surface was equivalent to around 3% moisture content. The newer requirement of 75% RH at 0.4x slab depth is a tighter specification and is approximately equal to 2% moisture content (similar to the DIN standard requirements) and 60% RH at the surface. The textile floor covering figures are less stringent.

The nominal moisture vapour transmission rate of 15gm/m²/24 hours is considered to be the maximum permitted for resilient flooring as per the requirements of AS2870 for dampproofing of floors. Hence we need to maintain the vapour transmission rate well below.

May thanks to google.com and Doc88.com - from where the details were took.