HIGH PERFORMANCE CONCRETE BY LEAST COST | |
| Conference | 33rd Our World in Concrete and Structures (OWICs) - 2008 |
| Authors | Mohamed M Yousry El Shikh*, Mansoura University, Egypt |
| Handle | 100033013 |
| Key Words | high performance concrete; costs; compressive strength; mineral admixture; chemical admixture; fibre; cement type; cement content. |
| Abstract | Knowledge of economy of High Performance Concrete (HPC) is vital to the application of these materials in practice. The high performance concrete may be obtained by different combinations of aggregate types, chemical and mineral admixtures. In addition, steel fibres may be used to enhance toughness and ductility. This range of approaches leads to different coefficients of costs values and extensive investigation is essential to provide the detailed information which is required to achieve least cost. Therefore, in this paper, the effect of using silica fume (microsilica), fly ash, gravel, dolomite, ordinary Portland cement, Sulphate resistance cement, Superfine cement and various chemical admixtures in different combinations is examined to get high performance concrete by least cost. Associated differences in the rate of strength development (100 - 140 MPa) and (100-150mm) slump may also have to be taken into consideration to achieve HPC by least cost. The investigation explains that, choice of economic mixes achieve the required performance; will play an important role in concrete economy. It’s found that, there are many mixes realize the required strength and slump, but these mixes are not necessarily economic mixes. Generally, on average, the cost of normal, medium, high, very high and ultra high strength concrete mixes is found to be equal 269.85LE, 323.57LE, 397.89LE, 448.32LE and 518.11LE respectively (US $ = 5.5 LE). Thus the strength increase from category to the other would be adopted by increasing the rate of cost by a percentage 20%, 47%, 66% and 92% respectively. This paper reports experimental and analytical works determining the guidelines to get high performance concrete mixes by least costs and important recommendations are drawn. |
| Full Text |  100033013 |
| Link to this page | www.cipremier.com/100033013 |
