Standard Abrams Slump Cone Mold
Rigid galvanized sheet steel cone with 100 mm top opening, 200 mm base, 300 mm height, and dual foot pieces.
Civil Engineering / Concrete Slump Test
FREE TO EXPLORELABORATORY 01 · CIVIL ENGINEERING
Fresh Concrete Workability & Consistency Determination by Abrams Slump Cone
Determine the workability, rheological consistency, and slump loss of freshly mixed Portland cement concrete under variable water-cement ratios (w/c) using the standard Abrams slump cone according to ASTM C143 / BS EN 12350-2. Explore interactive structural mechanics, materials simulation, and civil engineering telemetry.
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Your virtual civil engineering laboratory.
MEASURED SLUMP HEIGHT S—
CIVIL INFRASTRUCTURE TELEMETRY
Ready to sample with w/c Ratio = 0.5 ratio.
Adjust w/c Ratio, then execute civil engineering measurement.
Civil engineering telemetry is evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity structural mechanics and geotechnical continuum modeling.
Civil engineering assumptions and boundary condition limits
The civil engineering physical models apply within the specified calibrated operational window (0.4 to 0.65 ratio). Evaluated using standard Grade C25/30 mix proportion (1:2:3 cement:sand:gravel by mass) with dry 20 mm nominal maximum size crushed limestone aggregates. Linearized regression relates slump height S directly to w/c ratio with intercept representing minimum threshold hydration moisture.
Laboratory apparatus & testing equipment.
Hemispherical Bullet-Nosed Tamping Rod
Smooth steel rod 16 mm in diameter and 600 mm in length used for standard multi-layer consolidation.
Rigid Non-Absorbent Steel Base Plate
Machined flat, level base plate providing stable, non-yielding friction boundary condition.
Precision Rigid Steel Scale Rule
Measures vertical subsidence from top of inverted cone to displaced concrete center with 1 mm resolution.
Laboratory Pan Concrete Mixer
Motor-driven 40-liter counter-current pan mixer producing uniform batch dispersion in 180 seconds.
Scoop, Strike-Off Bar & Trowel Set
Facilitates rapid filling, leveling, and finishing of top concrete layer prior to mold lifting.
FOLLOW THE METHOD
A reason behind every step.
Determine the workability, rheological consistency, and slump loss of freshly mixed Portland cement concrete under variable water-cement ratios (w/c) using the standard Abrams slump cone according to ASTM C143 / BS EN 12350-2. Standardized parameter settings: 0.4, 0.45, 0.5, 0.55, 0.6, 0.65 ratio.
01
Apparatus Cleaning & Moisten Conditioning
Clean interior surface of the slump cone and base plate thoroughly; moisten with a damp sponge to remove surface dust and eliminate dry suction absorption.
02
Base Plate Positioning & Clamping
Place the cone firmly on the level base plate, standing on the foot rests to ensure a rigid seal and prevent lateral movement during rodding.
03
First Layer Filling & Rodding
Fill the cone to approximately one-third its volume (depth of ~70 mm); rod uniformly with 25 strokes distributed evenly over the cross section.
04
Second & Third Layer Compaction
Fill the second layer to two-thirds volume (~155 mm) and rod 25 times penetrating into bottom layer; fill third layer overflowing the top, rod 25 times penetrating second layer.
05
Strike-Off & Vertical Mold Extraction
Strike off excess concrete flush with the top rim using the tamping rod with a rolling screeding motion; clean spilled concrete from base plate; lift cone vertically in 5 ± 2 seconds without rotational jerking.
06
Slump Measurement & Inspection
Invert cone next to concrete mass; lay tamping rod across cone top and measure vertical distance to the displaced center of the slumped mass; record slump type (true, shear, collapse).
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into civil engineering insight.
Points are your recorded observations. The solid regression line validates Concrete Slump Test mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
S = 240.0000 · (w/c) - 75.0000
| # | Water-Cement Ratio (w/c) (ratio) | Measured Slump Height S (mm) | Water-cement ratio (w/c) | Measured slump height S (mm) | Remove |
|---|
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CHECK YOUR UNDERSTANDING
Explain what the civil engineering metrics mean.
The standard dimensions of the Abrams slump cone mold are:
How many strokes of the tamping rod are applied per layer during the slump test?
A fresh concrete mix exhibiting a shear slump indicates:
Raising the slump cone mold vertically should be completed in approximately:
THEORY AND STRUCTURAL CONTEXT
Civil engineering background & physical principles.
Workability is among the most vital rheological properties of freshly mixed concrete, defining the ease, homogeneity, and cohesiveness with which concrete can be mixed, transported, placed, compacted, and finished without destructive honeycombing or segregation. Developed by Duff Abrams in the early 20th century, the slump test employs a truncated conical mold (100 mm top diameter, 200 mm base diameter, and 300 mm height). When fresh concrete is filled in three equal layers, consolidated with 25 standard strokes of a 16 mm bullet-nosed tamping rod, and the mold is smoothly raised vertically in 5 ± 2 seconds, the unsupported concrete mass subsides under its own self-weight. The vertical drop between the original top surface and the displaced centroid defines the slump S. In structural civil engineering, slump classifications dictate placement applications: true slump (25 to 100 mm) for heavily reinforced foundations and columns, shear slump indicating plastic collapse or lack of cohesion, and collapse slump (>150 mm) observed in superplasticized self-consolidating mixes. In this laboratory investigation, fresh concrete batches with identical aggregate proportions are tested across water-cement ratios from 0.40 to 0.65 to establish the linear workability response and calibrate water-demand sensitivity.
S = 240.0000 · (w/c) - 75.0000
Evaluated using standard Grade C25/30 mix proportion (1:2:3 cement:sand:gravel by mass) with dry 20 mm nominal maximum size crushed limestone aggregates. Linearized regression relates slump height S directly to w/c ratio with intercept representing minimum threshold hydration moisture.