File Name: effect of cement replacement by silica fume and fly ash creator.zip
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- Effect of Thermal-cured Hydraulic Cement Admixtures on the Mechanical Properties of Concrete
- Flow ability
The applications of steel slag powder and steel slag aggregate in ultra-high performance concrete UHPC were investigated by determining the fluidity, nonevaporable water content, and pore structure of paste and the compressive strength of concrete and by observing the morphologies of hardened paste and the concrete fracture surface. The results show that the fluidity of the paste containing steel slag is higher. The nonevaporable water content of the hardened paste containing steel slag powder is close to that of the control sample at late ages. Both steel slag powder and steel slag aggregate react and connect tightly to gels and hardened paste, respectively. The UHPC containing steel slag aggregate demonstrates higher compressive strengths.
The use of fly ash in portland cement concrete PCC has many benefits and improves concrete performance in both the fresh and hardened state. Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost effective. When fly ash is added to concrete, the amount of portland cement may be reduced. Benefits to Fresh Concrete. Generally, fly ash benefits fresh concrete by reducing the mixing water requirement and improving the paste flow behavior. The resulting benefits are as follows:.
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Print Send Add Share. Notes General Note: The current state of practice in the construction industry is to supplement concrete mixtures with supplementary cementitious materials such as slag or class F coal fly ash as a means to enhance the plastic and elastic properties of concrete while reducing the cost. The production of class F fly ash is currently being reduced due to the implementation of natural gas powered energy facilities. The industry is in need of a n alternate material s of comparable performance to bridge the gap in materials that will be caused by the elimination of class F fly ash. This research investigates many alternative supplemental cementitious materials in binary and ternary blended cementitious systems at 20 to 70 percent replacement levels for portland cement.
Effect of Thermal-cured Hydraulic Cement Admixtures on the Mechanical Properties of Concrete
In the cement industry, researchers have worked on blending cement with supplementary cementitious materials SCMs to enhance the mechanical properties of concrete. For technical and environmental reasons, previous studies have recommended that concretes be designed with less ordinary Portland cement OPC. Other researchers encourage the use of thermal treatments at the precast stage. In this work, high volumes of various SCMs other than OPC were used to prepare five cement formulations, including a control sample. Initial tests of three hydraulic binders were performed to check their suitability before mixing cement samples. The samples were treated in water, air, hot water, and hot air curing HAC conditions after demoulding. The study showed that a combination of rice husk ash RHA and fly ash FA with OPC in the binder matrix, cured under HAC conditions, gave the best compressive and flexural strength results with the lowest water absorption.
Show all documents Effect of self curing agents on the different properties of cement and mortar The effect of Polyethylene glycol PEG and Polyacrylamide PAA addition, on the properties of the ordinary cement and mortar, such as setting time, flow-ability, flow ability, compressive,[r]. Experimental Investigation on Self Compacting Concrete Using Quarry Dust The flow ability of self compacting concrete depends on the powder and paste content. Hence, in order to increase the flow ability , mineral admixtures such as fly ash has been used. Table 2 gives the physical properties of the fly ash. These aggregates should be round, properly graded and smaller in maximum size which increases the flow ability and passing ability of SCC during the placement and avoids necessary bleeding and segregation.
Muhit1, S. Ahmed2, M. Amin1 and M. Raihan1 1.
Keywords: Fad , compressive strength , flexural strength , porthland , DRX. Authors: P. Parthiban , J. Keywords: compressive strength , alccofine , RCPT , wood ash pellets.
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