Humboldt Blog

Asphalt, Technical

This guest post was written by Chuck Oden, PhD of ESS. This white paper was originally published by ESS and we are sharing it here, with his permission. Introduction The Humboldt Asphalt Pavement Scanner (APS) is a revolutionary new system that provides detailed and comprehensive quality information for new asphalt mats without...

Laboratory, COVID-19

This guest post was written by Jack Germaine. He is a Research Professor of Civil and Environmental Engineering at Tufts University. Universities were quick to adapt to the norms of social distancing. Various modes of remote delivery were implemented to allow students to continue educational progress. Laboratory subjects are...

Concrete

Knowing the quality of the concrete being used in construction is a requirement at building sites worldwide. Concrete slump testing is a quick and easy procedure that can be performed in real-time and on-site that is used to determine the workability as well as the consistency of fresh concrete. Concrete with slump values that...

Soil, Nuclear Density Gauge

Soil density is an important factor to most construction projects and provides critical support for buildings, roads, pavements and other structures. Soil is frequently disturbed during the development process resulting in the introduction of air or water into the ground. Any water particles or air voids must be removed from...

The WofA, or Women of Asphalt, is a national organization aimed at supporting women who work in the asphalt industry through education, mentorship and advocacy. Women of Asphalt was formed in 2017 with five founding members and has grown to over 1,000 members in 2020. There is no cost to join and you can do so at:...

Asphalt, Balanced Mix Design

This guest post is written by Fan Yin, PhD. He is an Assistant Research Professor at the National Center for Asphalt Technology at Auburn University. We are sharing it here, with his permission, but the original article may be found here. The Hamburg Wheel Tracking Test (HWTT) per AASHTO T 324 is widely used by asphalt...

Asphalt, Ductility Testing

What is Ductility Testing? Materials that are capable of deforming plastically before fracturing are defined as ductile. Ductile testing, therefore, involves measuring the amount of stress that can be applied to a material without fracture. Why is Ductile Testing Important? Ductile testing will tell you the tensile strength of...

Soil, Hydrometer Analysis

What is a Hydrometer? Hydrometers are used to measure the relative density of a liquid. They are primarily made of glass and have two parts: the hydrometer with a mercury weighted bulb at the bottom and a cylinder with graduation marks. The science behind the hydrometer is simple – the lower the density of the liquid, the more...

Laboratory

We understand, you get attached to your lab balance. You’ve had it for years and tend to rely on it like a third hand. But how long is too long to use the same balance? When is it time for a replacement? First off, consider these questions: Does your balance need maintenance more often than it used to? Does your balance hold...

Asphalt, Soil, California Bearing Ratio

The California Ratio (CBR) test is a penetration test used to evaluate the subgrade strength of roads and pavements. The California Bearing Ratio Test was developed by the California Division of Highways around 1930 and has subsequently been adopted by numerous states, the Federal Highway Commission, and many other countries....

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