Evaluating aggregates using ASTM C1778
ASTM C1778, “Standard Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete,” can help you decide how best to mitigate expansions due to reactive aggregates. It covers both […]
Testing
ASTM C1074 predicts the strength of concrete in place
Despite our need for durability and high performance, the most common design criterion for concrete is compressive strength. Usually we specify the 28-day strength, that is, the compressive strength after […]
Specifying tests for durable concrete
Throughout my career, our industry has been pursuing performance specifications for concrete. That is, we want specifications for what the concrete must do, not what it must be. The sticking […]
Comparing ASTM C1556 and NT Build 492
ASTM C1556 and NT Build 492 both measure the ease with which chloride ions migrate into concrete. Both test methods estimate the diffusion coefficient, a measure of the rate at […]
Preventing aggregate popouts
In Minnesota, Iowa, and South Dakota, we sometimes see aggregate popouts, particularly in concrete flatwork. Popouts are unsightly surface defects that may appear a few hours to a few weeks […]
Join the Beton team!
Beton is looking for a Laboratory Manager to join our team. The Laboratory Manager will be responsible for maintenance and operation of laboratory and testing equipment. The Laboratory Manager will schedule […]
“Classic” alkali-silica reaction
“Classic” alkali-silica reaction is a reaction between alkalis in cement and reactive silicate minerals in susceptible aggregates. The reaction creates a gel that absorbs water and expands, resulting in the […]
Lies, damned lies and statistics
Statistics were part of our everyday lives long before anyone had heard of COVID-19. Pick up a newspaper any day of the week and see how many stories you find […]
What is a pooled sample?
The engineers’ code of ethics requires us to “hold paramount the safety, health, and welfare of the public“. Here’s one way public health officials use statistics to do just that. […]
Hot-weather concreting
As the weather warms up, it’s good to review best practices for hot-weather concreting. The American Concrete Institute defines hot-weather concreting as “one or a combination of the following conditions […]