EFFECT OF SULFATES IN FINE AGGREGATE ON SOME PROPERTIES OF SELF COMPACTING CONCRETE INCORPORATING HIGH REACTIVE METAKAOLINE | ||
| Al-Qadisiyah Journal for Engineering Sciences | ||
| Article 1, Volume 6, Issue 4, December 2013, Pages 426-438 PDF (0 K) | ||
| Authors | ||
| Haider K. Ammash; Haider M. Al-Baghdadi; Nabeel Hasan Ali Al-Salim | ||
| Abstract | ||
| Fine aggregate contaminated with interior sulfates is an important problem of concrete manufacture in Iraq. It is difficult to obtain well graded fine aggregate with sulfates content within standard specifications. The main objective of this study is to investigate the effect of internal sulfates in sand on some properties of self compacting concrete (SCC) by adding natural gypsum to fine aggregate as a partial replacement by weight. In this work, two basic categories of selfcompacting concrete are used: (SCC) incorporating limestone powder (LSP) and SCC incorporating 10% high reactivity metakaolin (HRM) Class N plus limestone powder(LSP) .Four levels of sulfates contents in fine aggregate were investigated, these levels were ( 0.37, 0.5, 1.0, and 1.5)% which it is equal to(3.74, 3.99, 4.96 and 5.93)% by weight of cement for mixes contained limestone powder (LSP) and it is equal to (3.76, 4.01,4.98 and 5.96) % by weight of cement for mixes contains high reactivity metakaolin (HRM) Class N plus limestone powder(LSP). The experimental program is divided into two parts; the first part is devoted to produce self compacting concrete by using superplasticizers and fillers then determine the workability. Different test methods are adopted such as slump flow and T50 cm, V-funnel, VFunnel at T5 minutes, L-box and sieve segregation test. The second part is devoted to study the mechanical properties such as the compressive strength and splitting tensile strength. The results obtained from this work show that the optimum gypsum content was 0.5% by weight of fine aggregate for all mixes which gives increases in the compressive strength by a range(5.9 -10.1)% and in the splitting tensile strength by a range (1.2 – 8.5 )% for mixes of (SSC) with (LSP) and (LSP +HRM). | ||
| Keywords | ||
| SCC; limestone powder; High Reactivity Metakaolin; sulfates contents; compressive strength; splitting tensile strength; box; funnel; slump flow test; sieve segregation test | ||
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