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Field Investigation Methods
Published in Mark Edward Byrnes, Field Sampling Methods for Remedial Investigations, 2023
When sampling through asphalt/concrete or when sampling at depth, the following equipment are also required: Core barrel (slide hammer), hand auger, or rotary hammer drill with drill bitAluminum foilConcrete mortar mix to patch holes through asphalt/concreteSmall chisel or screwdriver for removal of temporary concrete patch
Tools Required: their Care and Proper Use
Published in Les Goring, Manual of First and Second Fixing Carpentry, 2018
Figure2.45: There is nowadays a wide range of dual-and triple-purpose drills to choose from, starting with the basic rotary-only drill and ending with the advanced electro pneumatic hammer drill. In the electric-powered range, of either 110 or 240 volts, the following combinations are available: the drill/screw-driver, drill/impact (percussion) drill/screwdriver, drill/rotary hammer drill/screwdriver, and combinations of battery-powered models such as the cordless screw-driver, drill/screwdriver, drill/impact drill/screwdriver, and the drill/rotary hammer drill/screwdriver. Careful consideration needs to be given in choosing a particular model in relation to the type of work to be done and its location regarding whether power is readily available and if so, whether it is 110 or 240 volts.
Sustained load performance of adhesive fastening systems in concrete
Published in Jaap Bakker, Dan M. Frangopol, Klaas van Breugel, Life-Cycle of Engineering Systems, 2017
R. Nilforoush, L. Elfgren, M. Nilsson
Two adhesive anchors were installed in each concrete foundation. The holes for installing anchors were drilled using an electric rotary hammer drill. The holes were then cleaned with a brush and air compressor. For both adhesive anchors of types A and B the holes had a diameter of 18 mm and a depth of 125 mm. For adhesive anchors of type E the holes had a diameter of 25 mm and a depth of 170 mm.
Investigation of pull-out characteristics of connections for post-installed rebar utilizing mortar-based binders and chemical adhesives
Published in Australian Journal of Structural Engineering, 2023
Anas Shahid Multani, Praveen Kumar Gupta
A vibrating rotary hammer drill was used to drill holes in the concrete used to support the post-rebar. With (10 + 2) 12 mm, (10 + 2) 14 mm, (12 + 4) 16 mm, (16 + 4) 20 mm, and (20 + 5) 25 mm diameter diamond bits, respectively, holes for anchors with diameters of 8 mm, 10 mm, 12 mm, 16 mm, and 20 mm were drilled along the specimens’ longitudinal axes of the specimens. All of the loose concrete fragments that would have interfered with the rebar’s ability to properly attach to the concrete were removed using compressed air. Later, while the samples were allowed to dry out as indicated in Figure 1(b), a water jet was employed for additional cleaning in case of specimens prepared for mortar-based binders (Shah et al. 2012). This process helps to create a clean and debris-free environment, allowing for better adhesion between the rebar and the mortar-based binders.
Product innovation concept generation based on deep learning and Kansei engineering
Published in Journal of Engineering Design, 2021
Xiong Li, Jianning Su, Zhipeng Zhang, Ruisheng Bai
It is well known that an image dataset in high quality is essential, if not most important, to the success of product concept image generation. However, it is not easy to get enough product pictures. Our collection of images is based on the approach mentioned in Section 2.2. First, some of the product images are crawled from a web page provided by the Bing search engine using a web crawler tool, and others are crawled from Amazon.com, JD.com and Taobao.com. For example, the results of the Bing search are shown in Figure 7. Table 1 lists the keywords and samples we used in the process of searching for hand drill images. Second, we manually check all product images and remove undesired images. It should be noted that we do not use a hammer drill as a search keyword. Thus, there are no hammer drill images in our dataset. Third, we used Easy Image Modifier for image filtering, format conversion (*.jpg), standard size (resolution: 256×256, 128×128). The combination of Vector Magic and Photoshop was used to improve pixel quality. Easy Photo Denoise was used for image noise reduction. Easy Image Modifier and Photoshop were combined for data augmentation technology (random colour and image flipping). Finally, we harvested 18,285 images of hand drills (i.e. hand drill dataset, named HD dataset) and 15,456 images of bicycle helmets (i.e. bicycle helmet dataset, named BH dataset).
Corrosion inhibition in reinforced concrete using silica fume immobilized bacterial cells
Published in Journal of Sustainable Cement-Based Materials, 2023
Kamal Anand, Shweta Goyal, M. Sudhakara Reddy
After 28 days of respective curing, one concrete specimen from each group was taken out and air-dried for 24 h. The concrete cubes were then drilled from two levels: up to 10 mm and between 40 and 50 mm from the top surface using a rotary hammer drill machine. The obtained concrete powder was stored separately in air-tight packets and was used to prepare AQS for further investigation. The procedure was adopted from Shaheen and Pradhan [59]. For preparing AQS, the concrete powder was blended with autoclaved distilled water in the 1:20 proportion by mass and then stirred for one day. Then this solution was filtered through Whatman no. 1 filter paper. The prepared AQS was then used for electrochemical tests on the bare steel specimens.