Table of Contents
What is sulfur capping?
Capping of concrete cylinders and drilled concrete cores with sulfur mortar or other capping compounds prepares specimens for compressive strength testing. Specifically, this procedure provides plane surfaces perpendicular to the specimen axis to evenly distribute loading forces.
Why do we use sulfur compound in capping cylindrical concrete specimen?
Capping concrete cylinders and grout prisms with sulfur mortar helps to give them a plane, level surface so that force is applied evenly to the entire end surface when the specimen is broken during the ASTM C39 procedure to test compressive strength.
What is sulfur mortar?
Sulfur mortars were prepared by silica flour, mica and carbon as filler in which silica flour can reduce odor problems. Sulfur mortar specimens have compressive strength (200-424 kg/cm2), tensile strength (more than 80 kg/cm2), and flexural strength (110-120 kg/cm2).
Why is capping needed?
Capping after a root canal procedure not only helps the treated tooth to regain its strength but also helps to save surrounding teeth from getting damaged.
What is the method of capping?
Capping involves placing a cover over contaminated material such as landfill waste or contaminated soil. Such covers are called “caps.” Caps do not destroy or remove contaminants. Instead, they isolate them and keep them in place to avoid the spread of contamination.
Is sulfur used in concrete?
5.1. Sulfur-based concrete uses sulfur as a binder in its molten state [7], which replaces ingredients of conventional concrete like water and cement. Sulfur is heated to make molten sulfur, which is cooled to form hardened concrete [92].
What is the strength of sulfur?
The Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to scratch another mineral visibly. Sulfur is has a hardness of approximately 2.
What is a capping layer?
A capping layer helps to create a construction platform where the subgrade is not viable. It is granular product from a crushed rock quarry, and often incorporates recycled materials. Capping layer materials help to reduce costs and to protect the subgrade from rainfall and weathering.
How many layers do you place in a slump cone?
The steel slump cone is placed on a solid, impermeable, level base and filled with the fresh concrete in three equal layers. Each layer is rodded 25 times to ensure compaction. The third layer is finished off level with the top of the cone.
What is the ASTM standard for concrete?
The ASTM C39 test standard for compressive strength of concrete cylinders requires numerous checks for dimensions of the concrete cylinders and alignment during testing. The manual instructs and illustrates acceptable practices to properly perform these measurements.
What are capping materials?
What is the compressive strength of Sulphur concrete?
Tested sulfur concrete has compression strength of 20 MPa, and after 14 days it reaches the strength of 25 MPa, which has a growth rate of 25 percent, but after this time the compressive strength of sulfur comes down even less than the resistance of 14 days and gets a growth rate of 12.5 percent compared to the …
How do you make concrete sulphur?
Cement and water, important compounds in normal concrete, are not part of sulfur concrete. The concrete is heated above the melting point of sulfur ca. 140 °C (284 °F) in a ratio of between 12% and 25% sulfur, the rest being aggregate.
What colour is sulfur?
pale yellow
Pure sulfur is a tasteless, odourless, brittle solid that is pale yellow in colour, a poor conductor of electricity, and insoluble in water. It reacts with all metals except gold and platinum, forming sulfides; it also forms compounds with several nonmetallic elements.
How thick is a capping layer?
They are constructed by: Laying a relatively thin layer of material (max. 250mm). Thoroughly compacting the layer.
What is a capping material?
As subbase, capping or fill material, the material is exposed to natural outdoor conditions, potentially including sulphates that may be present in the surrounding soils. It is standard practice to evaluate the resistance of the aggregate to weathering, in the form of sulphate soundness tests.