Multi-scale simulation of capillary pores and gel pores in Portland cement paste

The microstructures of Portland cement paste (water to cement ratio is 0.4, curing time is from 1 day to 28 days) are simulated based on the numerical cement hydration model, HUMOSTRUC3D (van Breugel, 1991; Koenders, 1997; Ye, 2003). The nanostructures of inner and outer C-S-H are simulated by the packing of monosized (5 nm) spheres. The pore structures (capillary pores and gel pores) of Portland cement paste are established by upgrading the simulated nanostructures of C-S-H to the simulated microstructures of Portland cement paste. The pore size distribution of Portland cement paste is simulated by using the image segmentation method (Shapiro and Stockman, 2001) to analyse the simulated pore structures of Portland cement paste. The simulation results indicate that the pore size distribution of the simulated capillary pores of Portland cement paste at the age of 1 day to 28 days is in a good agreement with the pore size distribution determined by scanning electron microscopy (SEM). The pore size distribution of the simulated gel pores of Portland cement paste (interlayer gel pores of outer C-S-H and gel pores of inner C-S-H are not included) is validated by the pore size distribution obtained by mercury intrusion porosimetry (MIP). The pores with pore size of 20 nm to 100 nm occupy very small volume fraction in the simulated Portland cement paste at each curing time (0.69% to 1.38%). This is consistent with the experimental results obtained by nuclear magnetic resonance (NMR)

The comparison between sulfate salt weathering of portland cement paste and calcium sulfoaluminate cement paste

In this paper, the damage performances of sulfate salt weathering of Portland cement paste and calcium sulfoaluminate (CSA) cement paste were compared according to authors' previous studies. It was found that the evaporation zone of speciments partially immersed in 10% Na2SO4 solution were both severely deteriorated for Portland cement and CSA cement. However, the differences were more significant: (1) the CSA cement paste were damaged just after 7 days exposure compared to the 5 months exposure of Portland cement paste under the same exposure condition of RH 60% and 20°C; (2) the cement paste specimen was split into several pieces along the shrinkage cracks, and the damaged CSA cement paste consisted of a detachment of successive paste layers; (3) gypsum and ettringite were identified in the Portland cement paste and attributed to the paste failure mechanism, however sodium sulfate crystals were clearly observed in the detached paste layers. According to the comparison the so-called sulfate weathering of Portland cement concrete was discussed

How do we know it is us without our past?

44 pp. OCR and bookmarks supplied by UO. Maps, figures. Published 1974. Captured December 4, 2008.These are some of the notions, plans and methods which indicate that the preservation movement is off dead-center and moving in a positive direction. [From the document

Intermediate Biblical Greek Reader: Galatians and Related Texts

After completing basic biblical Greek, students are often eager to continue to learn and strengthen their skills of translation and interpretation. This intermediate graded reader is designed to meet those needs. The reader is “intermediate” in the sense that it presumes the user will have already learned the basics of Greek grammar and syntax and has memorized Greek vocabulary words that appear frequently in the New Testament. The reader is “graded” in the sense that it moves from simpler translation work (Galatians) towards more advanced readings from the book of James, the Septuagint, and from one of the Church Fathers. In each reading lesson, the Greek text is given, followed by supplemental notes that offer help with vocabulary, challenging word forms, and syntax. Discussion questions are also included to foster group conversation and engagement. There are many good Greek readers in existence, but this reader differs from most others in a few important ways. Most readers offer text selections from different parts of the Bible, but in this reader the user works through one entire book (Galatians). All subsequent lessons, then, build off of this interaction with Galatians through short readings that are in some way related to Galatians. The Septuagint passages in the reader offer some broader context for texts that Paul quotes explicitly from the Septuagint. The Patristic reading from John Chrysystom comes from one of his homilies on Galatians. This approach to a Greek reader allows for both variety and coherence in the learning process. Other unique features within this intermediate Greek reader include a set of word studies for important Greek words in Galatians, a discussion of the basics of textual criticism, and a brief glossary of syntax and key concepts in biblical Greek. This reader is a collaborative project that developed out of an advanced Greek course at Portland Seminary (2017-2018). The following students contributed equally to the content of the textbook. Alexander Finkelson (MATS, Portland Seminary, 2018) Bryn Pliska Girard (MATS, Portland Seminary, 2018) Charles E. R. Jesch (MDIV, Portland Seminary, current student) Paul C. Moldovan (MDIV, Portland Seminary, current student) Jenny E. Siefken (MATS, Portland Seminary, current student) Julianna Kaye Smith (MATS, Portland Seminary, 2018) Jana Whitworth (MDIV, Portland Seminary, current student) Kyle J. Williams (MATS, Portland Seminary, 2018)https://digitalcommons.georgefox.edu/pennington_epress/1001/thumbnail.jp

2008-2012 strategic plan

12 pp. Bookmarks supplied by UO. Illus. Published February 2008. Captured September 8, 2009.This Plan is anchored by five Strategies that will guide our work and financial investments over the next five years. 1. Foster an open, inclusive, and accountable approach to economic development and prosperity in Portland and the region. 2. Position “communication” – listening as well as informing – at the center of every initiative we undertake. 3. Seek and cultivate new and mutually beneficial partnerships. 4. Develop new and innovative tools to finance the city’s livability and development objectives. 5. Care for the job satisfaction and professional development needs of the people of the organization, and cultivate organizational health and diversity. [From the Plan

Old Town / Chinatown development plan

46 pp. Bookmarks modified by UO. Maps, figures, appendices. Adopted December, 1999. Captured February 27, 2009.The Old Town/Chinatown Development Plan, identified as an immediate need in the Vision Plan, utilizes the goals and components of the Vision Plan to prepare a strategy for immediate, short-term and long-term public and private investments. [From the Plan]"Funding for the Old Town/Chinatown Development Plan was provided by the Portland Development Commission.

Portland, Town of and Town of Portland Unit 6321, Civil Service Employees Association, Inc. Local 1000, AFSCME, AFL-CIO, Chautauqua County Local 807

In the matter of the fact-finding between the Town of Portland, employer, and Civil Service Employees Association, Inc. Local 1000, AFSCME, AFL-CIO, Chautauqua County Local 807, Town of Portland Unit 6321, union. PERB case no. M2009-228. Before: Samuel Cugalj, fact finder

Denorval Unthank Park assessment

23 pp. Bookmarks supplied by UO. Tables, figures, illus., appendix. Published 2004. Captured August 28, 2009.The assessment and recommended improvements proposed for Denorval Unthank Park will fulfill the ICURA accepted goals and strategies by enhancing an existing park and creating a better environment within the Boise Neighborhood and surrounding community. [From the document]"This report is funded by the Portland Development Commission.

Summer of Shrew, Part 1: A Tale of Two Cities

In the first of a four-part series on Shakespeare\u27s The Taming of the Shrew, Daniel Pollack-Pelzner introduces two high-concept professional productions of the play — one in Ashland, Oregon at the Oregon Shakespeare Festival, and one in Portland, Oregon at the Portland Shakespeare Project

A review of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete

In this review we discuss a wide range of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete. They are classified broadly as follows: (1) Use alternative fuels and/or alternative raw materials in the manufacture of Portland-based cements. (2) Replace Portland clinker with “low-carbon” supplementary cementitious materials (SCMs) in concrete. (3) Develop alternative low-carbon binders not based on Portland clinkers. The first approach mainly represents incremental improvements that can be achieved fairly easily and cheaply as long as suitable raw materials can be found. The second approach ranges from incremental improvements, if low levels of SCM substitution are used, all the way to major innovations for binders with very high Portland clinker replacement levels. The third approach is the most risky but also holds the greatest promise for truly significant CO2 reductions if it can be implemented on a large scale