ACI PRC-132.1-22, “Responsibility for the Care of Test Specimens for Acceptance of Concrete“, describes who should do what to ensure accurate acceptance testing. As a TechNote rather than a standard […]
ASTM C1077 is the “Standard Practice for Agencies Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Testing Agency Evaluation.” As we’ve discussed previously, in the construction […]
As part of its Prescription to Performance (P2P) initiative, the National Ready Mixed Concrete Association surveyed its members. They wanted to know which prescriptive requirements kept them from optimizing concrete. […]
Acceptance of concrete delivered to the job site is usually on the basis of compressive strength tests in accordance with ASTM C31 and ASTM C39. To compensate for variability in […]
Previously we discussed acceptance testing of concrete according to ASTM C31, Standard Practice for Making and Curing Concrete Test Specimens in the Field and ASTM C39, Standard Test Method for Compressive […]
For quality assurance in concrete construction, the most common acceptance criterion is the compressive strength of the concrete. A field technician makes specimens according to ASTM C31, Standard Practice for […]
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 […]
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 […]
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 […]
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 […]