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Showing 1 to 20 of 23 for “"class c fly ash"”.
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Alkali Silica Reaction Mitigation Using High Volume Class C Fly Ash
… was to develop preventative measures using Class C fly ash in concrete, which contains the moderately reactive aggregates found in the Arkansas River.</p> <p>The research used locally available fly ashes in order to represent the materials used in conjunction with the Arkansas River fine …
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Pavement thickness design using reclaimed hydrated Iowa class C fly ash as a base material
… thickness design method using reclaimed hydrated class C fly ash as a base material. Reclaimed fly ash from four Iowa sources was investigated, in an untreated state as well as stabilized with lime and raw fly ash. Standard tests, including proctor density, gradation, and specific gravity were …
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Evaluation of Laboratory Durability Tests for Stabilized Subgrade Soils
… clay, while the four stabilizer types included Class C fly ash, lime-fly ash, lime, and Type I/II portland cement. The three tests used in this comparative study were the freeze-thaw test, the vacuum saturation test, and the tube suction test. On average, to achieve the same 7-day unconfined …
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EFFECTS OF DEICING SALTS ON THE DURABILITY OF CONCRETE INCORPORATING SUPPLEMENTARY CEMENTITIOUS MATERIALS
… cementitious materials (SCMs), slag cement or Class C fly ash, exposed to sodium chloride (NaCl), calcium chloride (CaCl2), or magnesium chloride (MgCl2) is evaluated based on damage due to wetting and drying and scaling, with the goal of determining appropriate replacement levels of portland …
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EFFECT OF CRACK-REDUCING TECHNOLOGIES AND SUPPLEMENTARY CEMENTITIOUS MATERIALS ON SETTLEMENT CRACKING OF PLASTIC CONCRETE AND DURABILITY PERFORMANCE OF HARDENED CONCRETE
… containing different volume replacements of Class F and Class C fly ash and different combinations of a rheology-modifying admixture (RMA) with and without Class C fly. Program 3 involved concrete containing different dosage rates of one of two shrinkage compensating admixtures, one based on …
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Evaluation of Laboratory Durability Tests for Stabilized Aggregate Base Materials
… while the three stabilizer types included Class C fly ash, lime-fly ash, and Type I/II Portland cement. Specimens were tested for durability using the freeze-thaw test, the vacuum saturation test, and the tube suction test. Analyses of the test results indicated that the unconfined …
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Reducing Moisture Damage in Asphalt Mixes Using Recycled Waste Additives
<p>This thesis has determined that using fly ash as a mineral filler in asphalt pavements can help strengthen and reduce asphalt moisture damage. Also, dynamic shear rheometer tests show that these additives have a stiffening effect on asphalt binder. Moisture related damage is considered one of …
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On the Development of 8,000 psi Geopolymer Mortar for Practical Use in Field Applications
… psi at 28 days was developed using local sand, Class C fly ash, and readily available commercial grade chemicals. Modulus of elasticity was also examined during the course of research. Through the process of refining a mixture design, several design factors affecting compressive strength were …
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Optimization of Concrete Mixtures for Use in Structural Elements
… Highway and Transportation Department (AHTD) classifies two types of concrete mixtures that can be used in bridges. The first is Class S concrete, and the second is Class S(AE). Class S is used for the structural components and does not contain air entrainment while Class S (AE) is mainly used …
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Identification and Stabilization of Problematic Silts
… included hydrated lime, portland cement, and class c fly ash. A unitary set of guidelines for stabilizing problematic silts is proposed.
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Scale Model Shake Table Testing of Seismic Earth Pressures in Soft Clay
… consisting of a mixture of kaolinite, bentonite, class C fly ash and water. A flexible walled testing container founded on a 1g shake table was used to house the model soil and mimic 1D site response. An array of accelerometers embedded in the model soil measure during an input earthquake …
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Mitigation and Evaluation of Alkali-Silica Reaction (ASR) and Freezing and Thawing in Concrete Transportation Structures
… less deterioration as the incorporation of some Class C fly ash limited the development of ASR, and improved the durability to F/T. A three-year field test of various treatments applied to concrete barriers indicates silane reduces the moisture state of the concrete and slows the development of …
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Influence of subgrade improvement and non-uniformity on pavement performance
… from three projects describing self-cementing fly ash stabilization of RAP-soil mixtures, stabilization of limestone screenings for use as a structural layer in road construction, and finite element modeling results of various subgrade materials including self-cementing fly ash stabilized …
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Cementitious stabilization of soils in the presence of sulfate
… such as granulated blastfurnace slag (BFS), Class C fly ash (CFA), and an amorphous silica (AS). The expansion of the molds over time was monitored. Mineralogical and micro-structural analysis of the molds was also performed over time and correlated to expansion. The characterization methods …
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Scale Model Shake Table Testing of Underground Structures in Soft Clay
… soil mixture consisting of kaolinite, bentonite, class C fly ash, and water. A single cell Bay Area Rapid Transit (BART) cut-and-cover subway tunnel was used as the prototype for the 10th scale model subway cross-section. A flexible walled test container originally developed for a pile study at UC …
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Liming Characteristics of a High-Calcium, Dry Flue Gas Desulfurization By-product and its Effects on Runoff Water Quality
… dry FGD (DFGD) by-product in comparison to a Class-C fly ash (FA) and reagent-grade CaCO3, and to evaluate the effects of land application to a managed grassland on runoff, plant, and soil quality. Liming characteristics were determined by measuring the calcium carbonate equivalence (CCE), …
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Pavement sustainability optimization using quarry by-products and geosynthetics
… chemical admixtures, such as Portland cement and Class “C” fly ash, were used to improve the strength properties of QB materials. In general, treated QB materials were 10 to 30 times stronger than the virgin QB samples. Such significant increases in the strength of stabilized QB materials may …
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Evaluation of Resistivity Meters for Concrete Quality Assurance, Project TR201414
… (RCP), chloride ion diffusion, and the AASHTO penetrability classes. The research also performed a precision and bias evaluation to provide acceptable limits should SR be implemented for quality assurance and to refine language in the AASHTO test standard. In the precision and bias …
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Investigation of Parameters Influencing Reverse Fault Rupture Propagation to the Ground Surface
… Bay Mud and consisted of kaolinite, bentonite, class C fly ash, and water. Separate batches of clay were mixed with differing final water contents for the stiff and soft clay experiments. In each case, the fault box was filled to 60 cm and rupture was driven to the surface in two phases. The …
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Early-age hydration and volume change of calcium sulfoaluminate cement-based binders
… time, interaction between mineral admixtures (Class F fly ash, Class C fly ash, and silica fume) and OPC-CSA binder was studied. Various physico-chemical factors such as the hydration of ye’elimite (main component in CSA cement), amount of ettringite (the main phase responsible for expansion in …
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