University of Manchester

Effect of Aggregate Volume Fractions Prior to Uniaxial Compression Testing of Concrete

Jiaming Wang
Active

Scientific Case

Concrete is usually treated in models and simulations as a homogeneous material. The mechanical behavior and damage evolution of concrete is very complex and not fully understood. Studying the meso-scale structure, including aggregates, mortar and interface transition zones, will provide information to better understand the damage profile/mechanism and mechanical behavior However, the actual meso-structure of concrete is not easily obtained. With help of X-ray CT scanning, the meso-scale concrete structure will be characterized, meshed and imported into Abaqus for damage simulations.
In this project, image-based concrete meso-structures with various aggregate volume fractions of 20, 30 and 40% will be obtained, meshed and imported into FE model. The compressive strength will be measured after X-ray CT in concrete lab. The mechanical behavior and damage evolution between XCT image-based concrete model and a recently developed, fully synthetic model with aggregates randomly generated will be verified.
Composites

Experiment Design

Three cylinder specimens with 100 mm diameter and 200 mm height will be characterized by X-ray CT, containing aggregate volume fractions of 20%, 30% and 40%. These specimens are made with crushed limestone, OPC, water and sand, with the size of limestones varying from 6.3 mm to 10 mm. The full volume of these cylinders will be scanned, with an expected resolution of 50-100 μm, aiming to reveal the crushed limestone aggregates, air void space (& sand particles).
I am interested in crushed limestone aggregates with diameter ranging from 6.3 to 10 mm and air void/pores with approximately 1-4 mm in diameter.
Scanners and Rigs
Nikon XTH225
3
Not Required
1
None

Sample & Safety

Three cylinder specimens with 100 mm diameter and 200 mm height will be characterized by X-ray CT, containing aggregate volume fractions of 20%, 30% and 40%. These specimens are made with crushed limestone, OPC, water and sand, with the size of limestones varying from 6.3 mm to 10 mm. The full volume of these cylinders will be scanned, with an expected resolution of 50-100 μm, aiming to reveal the crushed limestone aggregates, air void space (& sand particles).
3
Other
No Hazard (MSDS of OPC available)

Scan Records

Project Report