Papworths Construction Testing Equipment

Measuring the coating thickness is an essential practice that contributes todetermining the quality of the product, its process control and pricing. There are many different instruments that can be used in measuring the thickness of the coating. In order to understand the instrument which is being used in measuring the thickness of a coating, it is important to know the working technique of a coating thickness gauge. There are several factors that determine the method that is best while using the coating thickness gauge and these factors include the type of coating, the substrate material, the thickness of the coating, the shape and the size of the coating etc. These factors help in the process of using the coating thickness gauge. For different materials and thickness, different techniques are used. Here we have mentioned the popular techniques. So scroll down and check out: §   Magnetic Film Thickness Gauges: It is used in the non-destructive method of finding the thickn...

The CBR Test is a measure of the resistance of a material to penetration of standard plunger under controlled moisture conditions and density. The California Division of Highways developed it as a method of evaluating and classifying soil-subgrade and base course materials for flexible pavements. The test might be conducted in the undisturbed or remoulded sample. A cylindrical plunger of 50 mm diameter is used to penetrate a pavement component material at 1.25 mm/minute. Loads of 5 mm and 2.5 mm are recorded. It is expressed as a percentage of standard load value at a respective deformation level to obtain the value of CBR. California Bearing Ratio Test on Subgrade Soil The primary aim of this test is to determine the California Bearing Ratio value of the subgrade soil. Apparatus for CBR Test Any compression machine that can operate at a constant rate of 1.25 mm per minute can be used. It consists of a moulds of 150 mm and 175 mm height offer a collar of about 50 mm leng...

This is a test to measure the penetration strength of ground, subgrades and base courses during new roads constructions. It was developed by California Department of Transportation to make sure roads are constructed on perfect areas of the earth. The first step is to measure the pressure needed to penetrate soil or surface in a bid to avoid unnecessary destruction of land.  ASTM Standards D1883-05, D4429 and AASHTO T193 are the standards used in describing perfect CBR outcomes on soils and rocks. Importance of CBR Test You have found roads degrading in quality and cracking easily after some time of usage. That is simply due to the weight being exerted on that particular road by the vehicles passing on it. CBR is used to measure the load bearing capacity of soils in a bid to construct roads that will be durable and safe for the purposed carriage means. It can even measure load bearing capacity of airstrips to make sure only the appropriat...

CBR stands for California bearing ratio; It is the penetration test which is used to evaluate the mechanical adaptability of the soil mass in the natural ground level. The rate is measured to assess the bearing capacity of the soil surface. The basic procedure of conducting the CBR test on the soil is as follows: Ø   First, weight of the empty mould is taken. Ø   And then, keep the spacer disc on the base plate and then place the filter paper on the disc and then fix the mould to the base plate with the plate inside a shape and append the collar over the mould. Ø   Add water to the specimen collected and then compact the same by the standard or modified proctor test. Ø   After the compaction, you need to remove the collar and then the surface needs to be levelled-up by using the cutting edge. Ø   Then the base plate needs to detach and removed from the spacer disc. Ø   Now take the total weight of the mould with the compacted...

Laboratory ovens are designed and built for drying a range of materials like concrete, rock, soil, asphalt, and aggregates. They come in various litre capacities, with temperatures control ranging from ambient to 250°C. The interior of a high-quality soil drying oven is made from stainless steel , and the exterior is crafted from sheet steel then finished in a powder-coated paint. It functions with forced convection or fan-circulation and is equipped with an analogue over-temperature protection thermostat and a digital control unit for direct reading. Proper usage and safety precautions must be observed when using a soil drying oven, as it poses health and fire hazards to users and its immediate surroundings. The following are some of the hazards you must be aware of: Health hazard – Volatilised substances can pose chronic or acute respiratory hazards. Burn hazard – The oven chamber becomes extremely hot, causing surfaces and materials to be dangerous when ...

The purpose of the direct shear test is to find soil’s shearing strength. A special type of apparatus is required to evaluate sandy soil’s shearing strength, which will help predict the material’s suitability for building foundations and for supporting retaining walls, slab bridges, sheet piling, and pipes. The test should also be able to identify the value of internal friction’s angle and soil cohesion when designing structures. One of the most advanced direct shear test apparatus is an automatic direct and residual shear testing machine , which comes with a carriage assembly, load hanger, and the integral 10:1, 11:1, and 9:1 lever loading device. A high-end direct shear test apparatus is designed to be floor mounted and motorised. A beam loading device is supplied to strengthen the shear box assembly’s vertical load, and it can handle up to 50kg. The total load on the specimen can reach up to 5kM. The machine is compatible with various round and square shear box assemblies,...

Ground penetrating radar (GPR) is state-of-the-art equipment used for exploring the subsurface of the earth. The cutting-edge imaging technology found in high-end GPR systems measures electromagnetic wave propagation and echo from the subsurface, which images and identifies changes in the magnetic and electrical properties beneath the surface of the earth. Hence, GPR systems are useful in locating underground utility lines in earth or post tensioning and reinforcing in concrete. Ground penetrating radar is surprisingly versatile for many other applications, including forensic research, land surveying, detecting unexploded land mines, conducting groundwater studies, and monitoring the structural integrity of airplane runways. GPR is useful in many different fields. It is used to study ice, groundwater, soil, and bedrock under earth sciences and it may be helpful in finding diamonds and gold nuggets in alluvial gravel beds. In that case, ground penetrating radar is used to fi...