scholarly journals Study on constraint degree calculation of frozen shaft inner wall mass concrete

2021 ◽  
Vol 2011 (1) ◽  
pp. 012038
Author(s):  
Li Fang-zheng ◽  
Zhang Ji-wei ◽  
Wu Wei-dong ◽  
Yao jin ◽  
Jin Xiao-gang
Keyword(s):  
Mass Concrete ◽  
Wall Mass

Influence of Different Fibers on Cracking Resistance of Shaft Wall Mass Concrete

2020 ◽  
Vol 852 ◽  
pp. 150-159
Author(s):  
Ji Wei Zhang ◽  
Fang Zheng Li ◽  
Shu Jie Liu
Keyword(s):  
Polyvinyl Alcohol ◽  
Steel Fiber ◽  
Basalt Fiber ◽  
Early Age ◽  
Mass Concrete ◽  
Main Function ◽  
Cracking Resistance ◽  
Polyvinyl Alcohol Fiber ◽  
Wall Mass ◽  
Shaft Wall

Early-age cracks in shaft concrete has become a serious problem in 1000m-plus deep mine due to the high internal temperature and thermal stresses. For the purpose of improve the cracking resistance of concrete, we report a novel experimental design by Temperature Stress Test Machine (TSTM) to study the influence of three fibers including basalt fiber, polyvinyl alcohol fiber and steel fiber on early-age cracking resistance of shaft wall mass concrete. Results of the experimental research indicated that (1) Three fibers can restrain expansion and shrinkage deformation finitely, and the shrinkage resistance effect of different fibers was steel fiber>polyvinyl alcohol fiber>basalt fiber; (2) Three fibers can finitely reduce the tensile stress increasing speed which was basalt fiber>polyvinyl alcohol fiber>steel fiber during; (3) The main function of fibers is restrain crack expansion and brittle failure rather than reduce cracking potential, and the rank of function is steel fiber>basalt fiber>polyvinyl alcohol fiber.

Establishing and Satisfying Thermal Requirements for Drilled Shaft Concrete Based on Durability Considerations

2021 ◽  
pp. 036119812199635
Author(s):  
Andrew Z. Boeckmann ◽  
Zakaria El-tayash ◽  
J. Erik Loehr
Keyword(s):  
Mechanical Response ◽  
Large Diameter ◽  
Thermal Cracking ◽  
Drilled Shafts ◽  
Maximum Temperature ◽  
Design Parameters ◽  
Mass Concrete ◽  
Temperature Differential ◽  
Thermal Requirements ◽  
Ettringite Formation

Some U.S. transportation agencies have recently applied mass concrete provisions to drilled shafts, imposing limits on maximum temperatures and maximum temperature differentials. On one hand, temperatures commonly observed in large-diameter drilled shafts have been observed to cause delayed ettringite formation (DEF) and thermal cracking in above-ground concrete elements. On the other, the reinforcement and confinement unique to drilled shafts should provide resistance to thermal cracking, and the provisions that have been applied are based on dated practices for above-ground concrete. This paper establishes a rational procedure for design of drilled shafts for durability requirements in response to hydration temperatures, which addresses both DEF and thermal cracking. DEF is addressed through maximum temperature differential limitations that are based on concrete mix design parameters. Thermal cracking is addressed through calculations that explicitly consider the thermo-mechanical response of concrete for predicted temperatures. Results from application of the procedure indicate consideration of DEF and thermal cracking potential for drilled shafts is prudent, but provisions that have been applied to date are overly restrictive in many circumstances, particularly the commonly adopted 35°F maximum temperature differential provision.

scholarly journals Surgical management of a rapidly growing chest wall mass of the neonate

2021 ◽  
Vol 64 ◽  
pp. 101725
Author(s):  
Danny Lascano ◽  
Michael J. Zobel ◽  
Abigail K. Zamora ◽  
Murad Alturkustani ◽  
Shengmei Zhou ◽  
...  
Keyword(s):  
Chest Wall ◽  
Surgical Management ◽  
Wall Mass ◽  
Chest Wall Mass

scholarly journals Metastatic small cell carcinoma of the lung with prominent spindle cell morphology and hemangiopericytoma-like vascular pattern: A sarcoma mimicker

2020 ◽  
Vol 8 ◽  
pp. 2050313X2098117
Author(s):  
Esra Nsour ◽  
Ali Al Khader ◽  
Bushra Al-Tarawneh
Keyword(s):  
Cell Carcinoma ◽  
Small Cell Carcinoma ◽  
Spindle Cell ◽  
Small Cell ◽  
Nerve Sheath Tumor ◽  
Vascular Pattern ◽  
Nerve Sheath ◽  
History Of ◽  
Wall Mass ◽  
Aggressive Clinical Behavior

Small cell carcinoma is a malignant neuroendocrine tumor with aggressive clinical behavior. Histologically, the tumor is characterized by the proliferation of small, round, blue cells. Here, we present the case of a 50-year-old man with a 1-month history of enlarging chest wall mass. Microscopic examination of the lesion revealed a highly cellular neoplasm composed of closely packed, atypical spindle cells with scant cytoplasm, inconspicuous nucleoli, and brisk mitotic activity. The hemangiopericytoma-like vascular pattern was prominent. Areas showing a fibrosarcoma-like fascicular pattern were also observed. The tumor was immunohistochemically positive for TTF1, synaptophysin, and chromogranin, confirming small cell carcinoma. Further investigations revealed a lung origin and widespread metastases. The tumor in this case closely mimicked synovial sarcoma or malignant peripheral nerve sheath tumor. Small cell carcinoma demonstrates a hemangiopericytoma-like pattern that can mimic sarcoma histologically. This is a serious pitfall that can significantly affect the speed of diagnosis and management.

scholarly journals Metastatic prostate adenocarcinoma presenting as a large right supraclavicular and anterior chest wall mass

2016 ◽  
pp. bcr2016214797
Author(s):  
Ku Hung Hsieh ◽  
Grace Tan Hwei Ching ◽  
Angela Chong Phek Yoon ◽  
Melissa Teo
Keyword(s):  
Chest Wall ◽  
Anterior Chest Wall ◽  
Prostate Adenocarcinoma ◽  
Wall Mass ◽  
Chest Wall Mass

scholarly journals An Unusual Case of Fungating Chest Wall Mass

2019 ◽  
Vol 36 (1) ◽  
pp. 211-212
Author(s):  
Divya Ragate ◽  
Charanpreet Singh ◽  
Navneet Arora ◽  
Arihant Jain ◽  
Deepesh Lad ◽  
...  
Keyword(s):  
Chest Wall ◽  
Unusual Case ◽  
Wall Mass ◽  
Chest Wall Mass
Sign in / Sign up

Export Citation Format

Share Document