Astm C 94-05

ASTM C94-05 is a construction standard that specifies requirements for ready-mixed concrete, helping producers and purchasers establish consistent expectations for material quality, production, and delivery. It addresses constituent materials, batching, mixing, transportation, and discharge, with conformity evaluated through sampling and tests such as slump, air content, temperature, and compressive strength when specified. In engineering practice, the standard supports quality control from the concrete plant to the job site and provides a common basis for ordering, inspecting, and accepting concrete used in structural and infrastructure projects. Applying its requirements can improve consistency, document performance, and reduce variability in placed concrete.

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Research

JoVE Journal - Bioengineering

Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives

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Cited by 6 •

2020

We present a procedure, ASTM D7998-19, for a rapid and more consistent evaluation of both dry and wet strength of adhesive bonds on wood. The method can also be used to provide information on strength development as a function of temperature and time or strength retention up to 250 °C.

Education

JoVE Science Education - Engineering

Stress-Strain Characteristics of Aluminum

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2023

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Aluminum is one of the most abundant materials in our lives, as it is omnipresent in everything from soda cans to airplane components. Its widespread use is relatively recent (1900AD), primarily because aluminum does not occur in its free state, but rather in combination with oxygen and other elements, often in the form of Al2O3. Aluminum was originally obtained from bauxite mineral deposits...

Using Synthetic Biology to Engineer Living Cells That Interface with Programmable Materials

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Cited by 5 •

2017

This paper presents a series of protocols for developing engineered cells and functionalized surfaces that enable synthetically engineered E. coli to control and manipulate programmable material surfaces.

Charpy Impact Test of Cold Formed and Hot Rolled Steels Under Diverse Temperature Conditions

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2023

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA One of the more insidious types of failures that can occur in structures are brittle fractures,which are mostly due to either poor quality materials or poor material selection. Brittle fractures tend to occur suddenly and without much material inelasticity; think of a bone fracture, for example. These failures often occur in situations where there is little ability for the material to develop...

Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells

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Cited by 11 •

2020

Radiation-induced DNA damage response activated by neutron mixed-beam used in boron neutron capture therapy (BNCT) has not been fully established. This protocol provides a step-by-step procedure to detect radiation-induced foci (RIF) of repair proteins by immunofluorescence staining in human colon cancer cell lines after irradiation with the neutron-mixed beam.

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