File Name: properties of fresh and hardened concrete .zip
It seems that you're in Germany. We have a dedicated site for Germany. This volume represents the current knowledge on the effect of SCMs slag, fly ash, silica fume, limestone powder, metakaolin, natural pozzolans, rice husk ash, special SCMs, ternary blends on the properties of fresh and hardened concrete e. Other topics treated in the book are postblending vs preblending, implications of SCM variability, interaction between SCM and commonly used admixtures e.
Concrete is strong in compression but relatively weak in tension and bending. It takes a great deal of force to crush concrete, but very little force to pull it apart or cause bending cracks. Compressive strength is determined primarily by the amount of cement used, but is also affected by the ratio of water to cement, as well as proper mixing and placing, and the adequacy and extent of hydration and curing. Both tensile strength and flexural bending strength can be increased by adding steel or fiber reinforcement. Required compressive strength is based on an analysis of the loads that will be applied and the soil conditions at the project site. Actual compressive strength is verified by testing samples in a laboratory using standardized equipment and procedures.
Mechanical strength , in particular compressive strength. The strength of normal concrete varies between 25 and 40 MPa. Above 50 MPa, the term High Performance Concrete is used 50 MPa corresponds to a force of 50 tonnes acting on a square with sides of ten centimetres. Concrete is extremely resistant to the physico-chemical attack emanating from the environment frost, rain atmospheric pollution, etc It is particularly well-suited for structures exposed to demanding and extreme conditions. Porosity and density. These properties are responsible for the first two.
Civil Lead. When concrete is its plastic state it is known as fresh concrete. Fresh concrete can be easily moulded to a durable structural member. Following are the properties of fresh concrete. The amount of water present in concrete should be in the proper ratio. Generally, a higher water-cement ratio is required for good workability.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Routine standard tests for fresh concrete include workability, air content, and matu- rity. A number of tests are recommended for evaluation of EOT concrete mixtures.
Fresh Concrete can be easily molded into any designed shape in construction. It can be prepared on the spot and may give a wide range of properties from easily available raw materials. Workability, in the simplest language, is the ease with which freshly prepared concrete can be transported and placed for the job and compacted to a dense mass. The fresh concrete which may be expected to give the best results must possess the property of workability. This is the most important property of fresh concrete. Fresh concrete should be capable of spreading uniformly without inducing any segregation of the aggregates.
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