مقاله انگلیسی بررسی پیشرفته بتن خود متراکم با استفاده از مواد افزودنی معدنی
Abstract
Introduction
Self curing concrete
Application of metakaolin in self curing processes
Materials present in self compacting concrete
Casting properties of concrete
Efect of acid on the hardened of concrete
Scope of self compacting concrete in the future applications
Conclusions
References
Abstract
Concrete is the most widely used construction material because of its molded ability into any required structural form and shape due to its fuid behavior at early ages. In compaction the vibration is essential for achieving the workability, the required strength and durability of concrete. Inadequate compaction of concrete results in more number of voids. Afecting strength and extensive durability of structures, self compacting concrete (SCC) provides a solution to these problems. And it is able to compact itself without any additional vibration. In this concrete, cement replacement with some material like fy ash, metakaolin, ground granulated blast furnace slag (GGBS) etc. because to reduce 5–7% of CO2 emissions in cement and due to the curing of concrete large amount of water is required. To overcome the high consumption of water it is needed to study the self-curing concrete. This investigation will shown scientifc basis for potential design of SCC materials for concrete structures.
Introduction
Concrete is a composite material composed of fne and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. In the past the lime based cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as calcium aluminates cement or with Portland cement to form Portland cement concrete. Many other non cementations’ types of concrete exist with diferent methods of binding aggregate together, including asphalt concrete with a bitumen binder, which is frequently used for road surfaces and polymer concretes that use polymers as a binder. When aggregate was mixed with dry portland cement and water, the mixture forms fuid slurry that is easily poured and molded into shape. The cement reacts with water and other ingredients to form a hard matrix that binds the materials together into a durable stone-like material that has many uses. Often, additives are included in the mixture to improve the physical properties of wet mix or fnished material. Most concrete was poured with reinforcing materials embedded to provide a tensile strength and yielding reinforced concrete. Concrete is one of the most frequently used building materials. Its usage worldwide is twice that of steel, wood, plastics and aluminum combined. Globally, the ready-mix concrete industry, the largest segment of concrete market, is projected to exceed $600 billion in revenue by 2025 [1, 2].