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Old 12-03-2007   #1
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Default Tạp chí KHCNXD số quý I/2007

Anh Trịnh Thành Huy - Phó TBT Tạp chí KHCNXD vừa gửi cho ketcau.com bản giới thiệu Tạp chí KHCNXD số I/2007, nội dung như sau:

Tạp chí KHCN Xây dựng số 1/2007

PGS.TS. Cao Duy Tiến, TS. Vũ Thị Ngọc Vân
Viện KHCN Xây dựng-một số công nghệ chuyển giao áp dụng hiệu quả trong thực tế 2 năm 2005 - 2006
GS.TS. Nguyễn Văn Phó, TS. Nguyễn Đình Xân
Biện pháp công trình và phi công trình trong phòng ngừa và giảm nhẹ thiên tai
KS. Uông Hồng Sơn, ThS. Lê Văn Minh
Xác định nguyên nhân và đề xuất giải pháp hạn chế nứt ống bê tông dự ứng lực D 2400mm
ThS. Hoàng Quang Nhu
Phương pháp tính tổn hao ứng suất trước do từ biến và co ngót của bê tông
ThS. Nguyễn Thanh Bình, TS. Trần Bá Việt
Ảnh hưởng của cốt sợi thép phân tán đến tính chất của bê tông mác cao trong điều kiện khí hậu nóng ẩm Việt Nam
TS. Nguyễn Như Quý
Nghiên cứu ảnh hưởng của phụ gia mịn bột đá vôi và tro bay nhiệt điện đến tính chất của hỗn hợp bê tông bơm
ThS. Nguyễn Nam Thắng, TS. Phạm Văn Khoan, TS. Lê Quang Hùng
Tác dụng ức chế ăn mòn cốt thép của canxi nitrit tại khe nứt bê tông
ThS. Nguyễn Văn Tá, TSKH. Trần Mạnh Liểu, ThS. Cao Thanh Tùng
Phương pháp dự báo khả năng sạt lở bờ sông theo chỉ tiêu tích hợp các yếu tố điều kiện kỹ thuật – tự nhiên vùng ven sông
ThS. Nguyễn Sơn Lâm
Các vấn đề an toàn môi trường khi xây dựng nhà máy điện nguyên tử (NMĐNT) ở Việt Nam
PGS. TS. Nguyễn Hùng Sơn
Công trình tường chắn đất có cốt trên vùng núi khai thác mỏ

ABSTRACT

Institute for Building Science and Technology - Some technologies transferred and effectively applied in the two years 2005-2006 (pp.3-5)
A/Prof. Dr. CAO DUY TIEN, Dr. VU THI NGOC VAN
This paper presents some technologies transferred and effectively applied in the two years 2005-2006 by the Institute for Building Science and Technology (IBST) in the following fields: Geotechnical engineering, Concrete and Construction chemical products, Restoration and conservation of monuments and cultural structures, Structural engineering and Surveying engineering. By presenting technologies transferred and effectively applied in the two years 2005-2006 the authors of the paper would like to seek the cooperation by individuals, organizations that are interested in the building science and technology field.
Structural and non-structural measures for prevention against and mitigation of damage caused by natural disasters (pp. 6-9)
Prof. Dr. NGUYEN VAN PHO, Dr. NGUYEN DINH XAN
This paper presents the authors’ opinions on the principles for structural and non-structural measures for prevention against and mitigation of damage caused by natural disasters, particularly the typhoons. In addition, the authors also present their initial considerations on specific measures that can be applied to the construction of building structures in order to overcome the consequences caused by the typhoon Shansane, which landed in the middle area of Vietnam on October 2006.
Determination of the *****’s cause and proposing measures for limiting *****s in prestressed RC pipes with a diameter of D2400mm (pp.10-15)
Eng. UONG HONG SON, MEng. LE VAN MINH
This paper presents an analysis by the authors to determine the *****’s cause that happned to prestressed RC pipes with a diameter of D2400mm. Potential causes are analyzed and investigated, such as: concrete quality of the pipe’s core, the transportation and installation, influence by environmental temperature, deformation due to prestress and shrinkage of concrete. In the end, according to the author, the cause of *****s is concrete shrinkage and a measure for limiting *****s in prestressed RC pipes with a diameter of D2400mm was proposed.
Estimating prestress loss of prestressed concrete structures due to creep and shrinkage (pp.16-21)
MEng. HOANG QUANG NHU
The time-dependent losses of concrete creep and shrinkage are all of significant importance in prestressed concrete structures. Effective determination of long-term prestress losess is an integral part of the design of prestressed concrete structures. An over-prediction in prestress loss results in an overly conservative design for service loads, while an under-prediction in prestress losses could result in significant *****ing at service loads. A precise determination of stress losses in prestressed concrete members is a complicated problem because the rate of loss due to one factor, such as relaxation of tendons, is continually being altered by changes in stress due to other factors, such as creep of concrete. This procedures here presented will provide more accurate results than by previous methods which gave no consideration to the actual shrinkage and creep coefficient.
Influence or discared steel fibers on the properties of high-grade concrete in the hot-humid climate of Vietnam (pp.22-29)
MEng. NGUYEN THANH BINH, Dr. TRAN BA VIET
There have been many studies on steel fiber reinforced concrete in Vietnam and all over the world. However, though the study on discared fiber reinforced concrete has been interested in, this study has not become systematical.
In this paper, the authors present a study on the influence of discared steel fibers on the properties of high-grade concretes in the hot-humid climate condition of Vietnam such as: plastic shrinkage, anti-*****ing due to plastic shrinkage, the development of concrete strength with the time, drying shrinkage,.. of steel fiber reinforced concrete, by comparing these properties with that of non-fiber reinforced concrete with the same grades.
Some studies into the effect of fine filler ground limestone and fly ash on properties of pump concrete mix (pp.30-33)
Dr. NGUYEN NHU QUY
Compared to concrete mix transported without using pump, the pumping concrete mix must have suitable slump and a mortar content within specified range. In additions the pumping concrete mix is characterized by good slump retention capacity. In this report the authors used ground limestone powder and fly ash as fine filler in combination with high range water reducing admixture to upgrade some properties of pumping concrete. Some conclusions have made on the capacity of used type of fine filler in reducing slump loss of pumping concrete mix with time.
Some research results on the effectiveness of calcium nitrite corrosion inhibitor in *****ed concrete structures (pp.34-37)
MEng. NGUYEN NAM THANG, Dr. PHAM VAN KHOAN, Dr. LE QUANG HUNG
This paper presents some research results on the effectiveness of calcium nitrite corrosion inhibitor (CN) in *****ed concrete. Based on the results obtained, the authors found that calcium nitrite can protect reinforcement in *****ed concrete regions from corrosion over a test period of 24 months. To study, the test specimens (with a concrete cover of 63mm) and a ***** width less than 0.5mm were exposed to alternating salt-solution and experienced a continuous drying process.
Method of evaluation and prediction of riverside erosive ability according to intergrative target of factors of technological – natural condition in riverside area (pp.38-41)
MEng. NGUYEN VAN TA, Dr. Sc. TRAN MANH LIEU,
MEng. CAO THANH TUNG
Based on analysis of cause, condition and mechanism of riverside erosion, some factors of technological – natural condition are chosen as: unhomogeneityt of geological structure (Eđc), material composition (Cd), carve durability (C), terrain segment high (H), riverside dip angle (tg), underground water level fluctuation (h), yearly crest of a flood (H), direction of current effect on riverside ().
This paper introduces method of density quantitative evaluation of each factor above-mentioned and integrate them into quantitative target for evaluation of riverside erosive ability. The method was used for evaluating the Red riverside erosive ability in Hanoi area.
The environmental safety matter when constructing Nuclear power plants in Vietnam (pp.42-48)
MEng. NGUYEN SON LAM
Nuclear power plants have a superiority over other kinds of power plants such as: high ouput, occupied land is less than the ussually required,.. However, there is an inherent problem with Nuclear power plants: the treatment of discharged wastes and radioactive leakage. The problem might cause serious environmental impacts.
This paper presents the required of aspects of environmental safety matter that should be observed when constructing and operating Nuclear power plants in Vietnam including: environmental aspects, environmental impact assessment caused by Nuclear power plants and some environmental strategies and specific measures for ensuring the environmental safety.
Reinforced retaining wall in areas of mining subsidence (pp.49-53)
Prof. Dr. NGUYEN HUNG SON
In this paper, the author presents some research results on reinforced retaining wall in areas of mining subsidence. With the help of Plaxis software, the author has simulated the forced deformation of the ground as a gradual subsidence below the construction during the exploitation process. The calculation showed the inclination of wall’s surface in relation to horizontal ground strain. In addition, variations of extreme axial force in layers of reinforcement during calculation are also presented in the paper.
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