Concrete quality check on site
An excessively high water content in the fresh concrete leads to capillary pores, whereby water can penetrate deep into the concrete. The consequences are increased frost sensitivity with the risk of spalling and reduced protection of the reinforcing steel against corrosion.
If there is too little water in the fresh concrete, not all cement grains are sufficiently supplied with water. Unhydrated cement can swell when water enters later and lead to cracks in the concrete and thus also to strength losses.
With 4 to 5 measurements, you can obtain reliable information on the water content in fresh concrete with the SONO within 1 to 2 minutes. You can thus quickly calculate the w/c ratio.
Compared to the previously common measurement of the water content in the Darr method (approx. 30 min), the PERI SONO WZ analyzer ensures time savings on the construction site.
The w/c ratio determines the proportion of cement gel, gel, capillary and air voids in the hardened concrete. Capillary and air voids in the hardened concrete have a great influence on the load-bearing capacity and durability of the concrete.
In addition to the physical properties, the water content of the fresh concrete also influences the visual concrete result.
SONO saves valuable time in determining the water-cement ratio not only on the construction site, but also in the laboratory.
Using innovative TRIME® radar technology, reliable measurement results of the water content in fresh concrete can be obtained quickly.
TRIME® radar technology
SONO works on the basis of radar technology with state-of-the-art TRIME®TDR technology (Time-DomainReflectometry). This novel technology has been validated in many years of cooperation with several scientific institutions.
In the so-called time-of-flight measurement, a radar pulse is used to determine the volumetric water content. The basic technology is successfully used for a wide variety of moisture measurements. For moisture measurement in fresh concrete, the method was further developed accordingly. The special probe and the associated handheld meter now offer a simple solution for reliable results on the construction site.
Simple handheld measuring device
The handheld device is very easy to operate, it only has four different keys: the two arrow keys can be used to select the setting variants, the "Measure" key starts the measuring process and the "Settings" key is used to access the setting parameters.
A few steps to successful measurement
Before starting the measurement, three parameters must be entered: the bulk density, the characteristics of the concrete mix design and the general set. In most cases, the data can be taken from the delivery bill, are known or can be determined quickly.
The handheld unit displays the water content in the fresh concrete. The actual w/c ratio can then be easily calculated on the basis of this water content and the cement content (specified in kg on the delivery document). The data for w/c ratio or water content determined in this way provide a high level of reliability in the production of concrete that conforms to norms.