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Showing 1 to 20 of 40 for “"Cementitious material"”.
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Advancements in concrete material sustainability : supplementary cementitious material development and pollutant interaction
Calcined clay and fly ash supplementary cementitious materials (SCMs) used in cement based materials were examined for their chemical and mechanical performance, as well as their pollutant interaction. This dissertation addresses three primary research questions, namely: (i) can zincite additions …
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Strength prediction and durability performance of concrete containing coal bottom ash as supplementary cementitious material under aggressive environment
… projected service life. Therefore, Supplementary Cementitious Material (SCM) need to be introduced to improve the strength and durability performance of concrete. Besides that, prediction of concrete compressive strength is also an important aspect for the safety and quality control of concrete …
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Performance and mechanism on a high durable silica alumina based cementitious material composed of coal refuse and coal combustion byproducts
… and develop a new silica-alumina based cementitious material largely using coal refuse as a constituent that will be ideal for durable construction, mine backfill, mine sealing and waste disposal stabilization applications. This new material is an environment-friendly alternative to …
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Practical Applications of Infrared, Raman and Nuclear Magnetic Resonance Spectroscopic Techniques for Qualitative, Quantitative and Structural Analysis of Pharmaceutical Drugs, Cementitious Material and Organic Molecules Containing Phosphorous
… the analysis of calcined clay as supplementary cementitious material, obtained from Ghana, a West African nation, which does not have an abundance of commonly used SCMs such as fly ash, silica fume, metakaolin, and slag. However, the abundance of clay minerals in the country could provide a …
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Optimization of Concrete Mixtures for Use in Structural Elements
… air entrainment. AHTD requires the same minimum cementitious material content for both classes of concrete. The purpose of this research is to determine if the cementitious material content of Class S mixtures can be reduced while still meeting AHTD specifications. The research program examined …
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Development of Concrete Shrinkage Performance Specifications
… and 0.0400 at 90 days. For the supplemental cementitious material mixtures, the percentage length change limits were 0.0400 at 28 days, and 0.0500 at 90 days. The CEB90 Code model performed best for the portland cement concrete mixtures, while the Gardner/Lockman Model performed best for the …
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Thermal Conductivity of foamed concrete
… 0.55) and (iii) polymer content (5 to 20 % of cementitious material weight) is presented. Experiments were done using a heat flow meter according to ASTM C 518-02. The experimental results show that thermal conductivity decreases with increasing foam content, water-cement ratio and increasing …
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Behaviour and Analysis of Strain Hardening Fiber Reinforced Cementitious Composites Under Shear and Flexure
… of concrete members. By introduction of novel cementitious material, a much greater need to develop a standard to treat the concrete in a systematic manner is felt. In this thesis, an alternative framework of analysis to interpret the shear failure and the corresponding strength of the failure …
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Understanding ureolytic calcium carbonate biomineralization for crack repair in cementitious materials
… bacteria-induced mineral precipitation occurs in cementitious material and how it can potentially remediate cracks in cementitious material. Furthermore, for the first time, the duration of treatment was discovered to be one of the most influential factors based on research results.
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Exploratory study on high-performance concrete for bridge decks in West Virginia
… aggregate, natural sand, and constant water/cementitious ratio. For each type, three mixtures were evaluated, with one of the three being defined according to the WVDOT-DOH specifications as a reference (20% fly ash and 30% slag by weight of total cementitious material), from which we varied …
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Mechanical And Computational Evaluation Of Cementitious Materials With Hollow Glass Microsphere Inclusions
The effect of volumetric replacement of cementitious materials by an inert filler known as hollow glass microspheres on elastic properties is evaluated in this study through a combined computational and experimental approach. This approach considered the variation in properties of type I Portland …
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Unprocessed rice husk ash as a partial replacement of cement for low-cost concrete
… cement in-country to meet the demand for this material, and therefore it has to be imported. In rice-producing countries rice husk ash-a material naturally high in silica-can be used as a supplementary cementitious material and can substitute a portion of Portland cement in concrete without …
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Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials
… of the effective elastic properties of cementitious materials through a voxel based FEA approach. Voxels are generated for a heterogeneous cementitious material (Type-I cement) consisting of typical volume fractions of various constituent phases from digital microstructures. The …
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USE OF CELLULAR CONCRETE FOR AIR CONVECTION EMBANKMENT TO PROTECT PERMAFROST FOUNDATION IN COLD REGIONS
… prevents its wide use in Alaska. An existing cementitious material, cellular concrete, may provide the solution.</p> <p>This study intends to systematically characterize the heat transfer patterns of ACE and identify the performance benefits of using cellular concrete for ACE through material …
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Sustainable cementitious materials for building and sorption applications
… Cement (OPC) is the most widely used cement material, but it contributes over 8% of the global CO<sub>2</sub> emission and the process is energy intensive. Moreover, OPC faces durability challenges, particularly in aggressive environments. Hence, there is rapidly increasing interest in …
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Strengthening of reinforced masonry walls subjected to out-of-plane pseudo-static cyclic load using advanced composite
… walls (URM) strengthened with advanced composite materials. Consequently, the strengthening design guidelines are limited in their scope to URM. This research aimed to investigate the behavior of reinforced masonry walls strengthened with advanced composite and subjected to out-of-plane …
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Synthesis and fracture toughness of macro-defect-free (MDF) cement
… seen to provide the high stiffness of a hydrated cementitious material with the high tensile strength of a polymer composite. It is usually made using polyvinyl alcohol (PVA) that undergoes some crosslinking with Al(OH)6 released as the cement hydrates. It is processed using high shear, typically …
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Investigation of Concrete Mixtures to Reduce Differential Shrinkage Cracking in Inverted T Beam System
… (LWCA). Mixes with fly ash as supplementary cementitious material (SCM) developed smaller stresses at the bottom of deck when compared to mixes with slag as the SCM.
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Durability specifications for structural concrete: an international comparison
… to exposure conditions, limiting values of material compositions and proportions, and cover depth to the reinforcing steel. Both prescriptive and performance requirements for concrete durability are described. In general terms, this dissertation concludes that most design standards are based …
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Synthesis and characterization of geopolymers for infrastructural applications
… generated by 3 different kinds of raw materials (i.e., metakaolin, mixture of red mud and fly ash, mixture of red mud and rice husk ash) was explored. For geopolymers from identical raw materials, variable parameters involved in the synthesis were examined to investigate the extent and …
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