# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DXnHCzlj4b5
- **Gondola URL:** https://gondola.cc/posts/64883921-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/86de1e199d.jpg
- **Posted:** 2026-04-26T22:09:24.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

Slump test (Abrams cone) in fresh concrete isn’t just a quick field check. It’s a controlled consistency assessment that indirectly reflects workability, cohesion, and water–cement ratio behavior under gravity-driven deformation.

In the standard procedure (per ASTM C143 / EN 12350-2), fresh concrete is placed into a conical mold in three equal layers, each rodded 25 times to eliminate entrapped air and ensure uniform compaction. Once the mold is lifted vertically, the concrete subsides. The vertical displacement between the original cone height and the displaced specimen is recorded as the slump.

A true slump indicates a cohesive mix with adequate internal friction. Shear slump suggests poor cohesion or segregation risk, often linked to insufficient fines or improper aggregate grading. Collapse slump typically indicates excessive water content or high-range water reducer dosage beyond optimal limits.

While slump is often treated as a proxy for workability, it does not directly measure placement energy, pumpability, or finishing characteristics. For high-performance or self-consolidating concrete (SCC), slump flow tests provide more relevant rheological insight.

Key variables influencing slump:

* Water–cement ratio (primary driver)
* Aggregate size, shape, and grading
* Admixtures (plasticizers, superplasticizers, air entrainers)
* Temperature and time since mixing (hydration kinetics)

Use slump results in context, not isolation. Pair with compressive strength tests, air content, and temperature measurements to ensure mix performance aligns with structural and durability requirements.

What type of slump do you see most often in your field tests, and how do you adjust your mix design in response

#CivilEngineering #ConcreteTesting #SlumpTest #ConstructionScience #MaterialsEngineering

## Stats

- **Views:** 77,613
- **Likes:** 438
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- **Comments:** 16

## Tags

materialsengineering, slumptest, constructionscience, civilengineering, concretetesting

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