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• W2220343216 abstract "High-performance concrete (HPC) is characterized by high content of cement and supplementary cementitious materials (SCMs). Using high binder content, low water-to-cementitious material ratio (w/cm), and various chemical admixtures in the HPC can result in higher material cost and greater risk of thermal and shrinkage cracking, thus reducing service life of the structure. This project seeks to investigate the feasibility of producing crack-free and environmentally friendly concrete (crack-free and Eco-Crete) for building and transportation infrastructure applications. Two types of concrete materials, including Eco-super workable concrete (Eco-SWC) and Eco-self-consolidating concrete (Eco-SCC) are of special interest in this project. Eco-Crete mixtures are developed with a binder content lower than 315 kg/m³ (530 lb/yd³). The concrete should develop 56-day compressive strength greater than 30 MPa (>4350 psi). Given the low binder content compared to the targeted performance level, binder composition and aggregate proportion are optimized based on the packing density to reduce the voids between particles. The optimized concretes exhibit low shrinkage given the low paste content and use of shrinkage mitigation approach, such as the use of a shrinkage reducing admixture (SRA), a Type G or K expansive agent (EX), and a lightweight sand (LWS), as well as using fibers to reduce cracking. A factorial design approach was also employed to quantify the effect of such materials on mechanical and shrinkage properties. The results indicate that, the combined use of 10% silica fume with either 40% fly ash or 40% slag exhibited the highest packing density of 0.66 compared to 0.52 for cement paste. The modified Andreasen packing model with distribution modulus (q) of about 0.29 fits reasonable well to express the particle size distribution (PSD) of aggregate for SCC with low binder content. Binary shrinkage reducing materials containing 7.5% Type G EX and 20% LWS or ternary system including 12.5% Type K EX, 2% SRA, and 20% LWS can be quite effective for developing Eco-Crete mixtures to exhibit crack-free properties." @default.
• W2220343216 created "2016-06-24" @default.
• W2220343216 creator A5047245508 @default.
• W2220343216 creator A5049073294 @default.
• W2220343216 date "2014-08-01" @default.
• W2220343216 modified "2023-09-26" @default.
• W2220343216 title "Design and Performance of Crack-Free Environmentally Friendly Concrete “Crack-Free Eco-Crete”" @default.
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