Concrete jobs often require a little more than just a standard ready mix. From high-strength concrete for high-rise buildings in the city to mass concrete for dams, Holderchem offers specialty concrete mix designs that are best suited for specific projects.

Do you like working on challenging industry projects? We are offering internships for people with strong initiative and proactive communication skills to perform desk research, and field and laboratory testing of construction materials in order to optimize specialty concrete mix designs.

The interns will focus on a specific concrete type, thoroughly reviewing published research pertaining to the specialty concrete under consideration as well as Holderchem and other suppliers’ literature. They will review the concrete mix properties specified by standards, suppliers, practitioners in the field, and literature, to design concrete mixes to achieve desired properties. They will conduct comparative test analysis of admixtures and other specialty products available from Holderchem that are used in the specialty concrete mix designs, confirming their conformity to Technical Data Sheets, seeking optimizations, establishing initial test performance reports, and recommending improvement actions if any.

The interns will in the course of their work conduct laboratory tests of concrete, soils, and aggregates following ASTM, EN, and LIBNOR test methods. They will suggest starting concrete mix design formulations highlighting specific mix properties of interest. Tests shall include Aggregates testing, Concrete Mix Design Testing, and Dry-mix testing wherever applicable.

The interns shall conduct lab and field tests under supervision to validate findings ensuring at all times full traceability in the conduct of their product development work. They shall establish a technical and material safety data sheet for the specialty concrete product developed. In the conduct of their work, they shall strictly adhere to Holderchem’s product development and validation guidelines.

Aggregates testing: (Common work for both subtends)

1. Sieve analysis for aggregates
2. Density, specific gravity, and absorption for coarse and fine aggregates
3. Fine materials in aggregates
4. Flakiness and elongation
5. Bulk density and voids in aggregates
6. Standard test method for organic impurities in fine aggregates

Section 1: Concrete mix: (Four weeks program)

1. Concrete mix design
2. Standard specification for chemical admixture for concrete
3. Slump testing
4. Compressive strength treating
5. Air content of freshly mixed concrete testing
6. Testing Air entraining admixture for concrete
7. Determination of setting times of concrete mixtures by penetration resistance

Section 2: Dry-mix (tile adhesive, waterproofing, and grout): (Four weeks program)

1. Methods of testing for mortars and masonry cement
2. Bulk density of mortars
3. Determination of dry bulk density of hardened mortars
4. Determination of adhesive strength of hardened rendering and plastering mortars on substrates
5. Determination of water absorption coefficient due to the capillary action of hardened mortar
6. Determination of slip for tile adhesives
7. Determination of open time for tile
8. Determination of tensile adhesion strength for the cement-based tile adhesives
9. Evaluation of tile adhesives, classification, requirements, designation, and conformity to industry standards
10. Testing of masonry cement
11. Specification for mortars for masonry
12. Assessment of masonry cements conformity to standard specifications
13. Assessment of mortars for unit masonry conformity to Standard specification
14. Setting time
15. Compressive strength
16. Flexural strength
17. Pull off strength
18. Drying shrinkage
19. Water absorption

The interns will also conduct routine maintenance, repair, and calibration of laboratory and field equipment.

Note: Working Hours will be From 7:00 to 16:00 Monday to Friday