إنتاج خرسانة عالية المقاومة بإستخدام اإلضافات

Abstract

Abstract :- High-Strength Concrete (HSC) represents a fundamental pillar in the development of modern engineering structures that require superior structural efficiency. This research aims to investigate the production of HSC using locally available resources, focusing on the role of advanced chemical admixtures and the integration of industrial waste to achieve engineering sustainability. The research problem lies in the limited adoption of HSC in local projects despite the availability of high-quality aggregates, due to a lack of studies on optimal mix designs and additive combinations. The research methodology followed a laboratory-analytical approach, where experimental mixes (M0 to M7) were modeled and designed to achieve a target compressive strength of 45 N/mm2. The study utilized two types of superplasticizers: PMM PLAST SP50 and Adicrete B2, while reducing the water-to-cement (W/C) ratio to minimum levels of (0.33). Furthermore, a hybrid mix was developed by adding iron filings at a rate of 10% as a mechanical reinforcement to consolidate the cement matrix and reduce porosity. The experimental results at 28 days showed exceptional success, as the actual achieved strength significantly exceeded the initial design target. The M7 mix (based on Adicrete B2) recorded the highest compressive strength in the research, reaching 47.33N/mm2, followed by the M5 mix, where iron filings demonstrated high efficiency in increasing strength to 42.22 N/mm2 The study confirmed a strong inverse relationship between the water ratio and load-bearing capacity, as superplasticizers helped transform the cementitious structure from a porous material into a high-density solid mass without affecting workability (Slump). The research concludes that the use of advanced chemical admixtures and the recycling of iron filings not only improves the mechanical properties of concrete but also contributes to producing environmentally friendly and economical concrete by reducing the dimensions of structural sections. Based on these findings, the researchers recommend adopting the use of superplasticizers in local construction projects and expanding studies on the effect of iron filings on the long-term durability of structures against harsh environmental condition