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Author: United States. Federal Highway Administration Publisher: ISBN: Category : Aggregates (Building materials) Languages : en Pages : 4
Book Description
Historically, aggregate gradation has been controlled by specifications that call out envelopes for individual fractions, typically the coarse aggregate and the fine aggregate. The shortcoming of this approach is that the gradation of the overall system is not addressed. While it is sensible to stockpile coarse and fine fractions separately to prevent segregation, it is the combined system that is critical in the final mixture.
Author: United States. Federal Highway Administration Publisher: ISBN: Category : Aggregates (Building materials) Languages : en Pages : 4
Book Description
Historically, aggregate gradation has been controlled by specifications that call out envelopes for individual fractions, typically the coarse aggregate and the fine aggregate. The shortcoming of this approach is that the gradation of the overall system is not addressed. While it is sensible to stockpile coarse and fine fractions separately to prevent segregation, it is the combined system that is critical in the final mixture.
Author: Bernard E. Lutter Publisher: ISBN: Category : Aggregates (Building materials). Languages : en Pages : 46
Book Description
Present computer techniques for determining aggregate blends to meet a specified gradation for bituminous pavement mix design are not entirely satisfactory. Often aggregate blends must still be optimized by trial-and-error hand calculations to approximate the desired gradation. In addition to gradation limits and tolerances, there are limitations for the amounts of particular aggregates to be used in a mix design or for the total amount of fines that can be present in the mix. This study was undertaken to develop the logic for a computer optimization techniques that would blend the given aggregates to conform as closely as possible to the desired gradation and to fall within the specified limits. As a result, two computer programs have been written using two different optimization techniques and are presently being used for bituminous pavement mix design at the U.S. Army Engineer Waterways Experiment Station (WES). Both programs satisfy the requirements of this investigation. (Author).
Author: Adam Rudy Publisher: Purdue University Press ISBN: 9781622602582 Category : Transportation Languages : en Pages : 70
Book Description
The ultimate goals of this study included investigation of the optimal ranges for paste content, amount of cementations materials and aggregate gradation for concrete paving mixtures. In general, the optimum concrete mixtures developed in this study contained low paste content (below 23%), and were characterized by low scaling and sorptivity. In addition, it was also possible to achieve high cement replacement levels for these mixtures. Finally, for optimized fly ash mixtures, the selection of well graded aggregate gradation with high packing density increased the most desired paste content for those mixtures, thus indicating that combined aggregate gradation has strong influence on concrete performance. Lastly, concrete mixtures developed with optimum ranges of variables studied in this research contained low cement content. The overall scope of the research was divided into three distinctive phases, each of which is described briefly below: PHASE I: This phase consisted of statistical optimization of the proportions of concrete binder. The Central Composite Design methodology (CCD) was used to design the experiment for the optimization of binder in three types of concrete mixtures: a) cement + fly ash, b) cement + GGBFS, and c) cement + fly ash + GGBFS. The variables studied in each of these systems included: paste content (from 21 to 25 % by mixture volume) and total content of supplementary cementitious material (SCM) in the mixture. This was expressed as weight percent of total binder, and varied depending on the binder system used. PHASE II: The main goal of this phase was to investigate the effect of different aggregate gradations on the fresh and hardened properties of optimized concrete mixtures developed in PHASE I, as well as to identify the most desired aggregate gradations for paving mixtures. Different aggregate gradations were prepared by blending of 2, 3 or 4 different sizes of aggregates based on concept of Shilstone's Coarseness Factor Chart. PHASE III: The concept of air-free paste-aggregate void saturation ratio (k") introduced in PHASE II seemed to fairly accurate link the properties of concrete mixtures with their paste content. Thus, it was decided to further investigate this concept in connection with aggregate packing density ( ). In addition, it was believed that defining optimum values of "k" will allow for revising the paste content ranges developed in PHASE I for different systems, and thus define more general optimum paste ranges for paving mixtures.
Author: A.M. Brandt Publisher: CRC Press ISBN: 9780419217909 Category : Architecture Languages : en Pages : 336
Book Description
Provides a clear, comprehensive introduction to the subject. Different problems of optimization are considered and illustrated with examples. Large sets of new experimental data are presented and discussed.
Author: Bernhard Middendorf Publisher: BoD – Books on Demand ISBN: 3737608288 Category : Technology & Engineering Languages : en Pages : 206
Book Description
With HiPerMat 5 on March 11-13, 2020 the 5th International Symposium on Ultra-High Performance Concrete and High Performance Construction Materials documents the actual state of development of application in the fields of: Material Science and Development, Composite Concrete Materials, Strength and Deformation behaviour of UHPC, Durability and Sustainability of UHPC, Design and Construction with UHPC, Structural Modelling and Optimisation, Lightweight Concrete Structures, High-Precision Manufacturing for Pre-Fabrication, Nanotechnology for Construction Materials, Innovative Applications, Smart Construction Materials, This volume contains the short versions (two pages) of all contributions that have been accepted for publication at HiPerMat 5.
Author: Publisher: ISBN: Category : Pavements, Concrete Languages : en Pages : 72
Book Description
This project was designed to explore the feasibility of lowering the cementitious materials content (CMC) used in Wisconsin concrete pavement construction. The cementitious materials studied included portland cement, fly ash, and ground granulated blast furnace slag. For the first phase, mixtures were prepared using the current WisDOT aggregate grading specification. For the second phase, mixtures were prepared using an optimized (e.g. Shilstone) gradation. A variety of tests for fresh and hardened concrete were conducted to determine the viability of low CMC mixtures for use in concrete pavement.
Author: Deniz Adiguzel Publisher: ISBN: Category : Alkali-aggregate reactions Languages : en Pages : 14
Book Description
Alkali-silica reaction (ASR) can cause serious cracking in concrete. The best method in order to avoid the occurrence of ASR is the non-use of reactive aggregate in concrete production. However, reactive aggregates in quarries must be used for the sustainable usage of resources. Therefore, a more practical approach is to identify the optimal blending of such aggregates, which can be achieved through the use of the Design of Experiment-Mixture Design Method (DOE-MD). In this study, empirical approaches that can be used for ASR estimation are suggested using DOE-MD in a quarry that produces concrete aggregate and has reactive and nonreactive aggregate resources in terms of ASR and by determining aggregate mixing ratios that do not create risk in terms of ASR. The quarry in question has three different regions, which are in terms of the type of aggregate available. As a result, the aggregate from Region 2 should be used at 19 % (Region 3: 81 %) in the mixture with aggregate from Region 3. The aggregate from Region 1 should not be mixed with the aggregate from Region 2 and should be used at most at 14 % (Region 3: 86 %) in the mixture with the aggregate from Region 3.
Author: United States. Federal Highway Administration
Author: United States. Federal Highway Administration
Author: Bernard E. Lutter
Author: Adam Rudy
Author: Media Kharazi
Author: 
Author: A.M. Brandt
Author: Bernhard Middendorf
Author: ACI Committee 302
Author: 
Author: Deniz Adiguzel