Tạp chí KHCNXD

Tạp chí KHCN Xây dựng số 3/2009

Ngày tạo : 15/07/2015

Tạp chí KHCN Xây dựng số 3/2009

TS. Nguyễn Hồng Hà, TS. Lê Trường Giang và các ctv
Đánh giá kỹ thuật về nhà ở lắp ghép do công ty Vinaconex Xuân Mai thiết kế và thi công,
TS. Nguyễn Huyên, KTS. Trịnh Anh Tuấn, KTS. Trịnh Thu Hương
Phân tích tính chất kinh tế – kỹ thuật – xã hội  của một số mẫu nhà ở cho sinh viên, công nhân và người có thu nhập thấp,
TS. Trần Minh Đức
Nghiên cứu xác định nhiệt độ nung gạch cổ tháp Chăm Phú Diên - Thừa Thiên Huế,
TS. Vũ Văn Đại, KS. Nguyễn Lê Minh Công, KS. Đoàn Văn Động
Cơ sở và một số giải pháp tiết kiệm năng lượng trong hệ thống thông gió và điều hoà không khí,
TS. Nguyễn Quang Phú, ThS. Đỗ Viêt Thắng, GS. Jiang Linhua, GS. Liu Jiaping
Phân tích rạn nứt sớm của bê tông tính năng cao bằng vòng thí nghiệm bị kìm chế sử dụng phương pháp phần tử hữu hạn,
ThS. Nguyễn Sơn Lâm
Nghiên cứu và áp dụng công nghệ hoạt hoá sinh học trong việc xử lý rác thải đô thị Việt Nam,
KS. Vũ Văn Đoàn, KS. Diêm Công Trang
Tính toạ độ vuông góc phẳng theo phép chiếu hình trụ ngang giữ góc dùng hàm số phức,
ThS. Lê Văn Hùng
Kiểm soát độ nghiêng của công trình dạng tháp bằng phương pháp toạ độ bên ngoài,
GS. TS. Wang Baotian, ThS. Vũ Mạnh Quỳnh
Kết hợp gia tải chân không với điện thấm để gia cố nền đất yếu - một nghiên cứu thực nghiệm,

ABSTRACTS

Technical assessment about prefabricated buildings designed and constructed by Vinaconex Xuan Mai company (pp.3-9)
Dr. nguyen hong ha, Dr. le  truong giang et al
To implement the directions by Ministry of Construction on the Program of social housing for workers, students and low-income people living in the urban areas, the Institute for Building Science and Technology IBST) has established an experts’ team in order to assess the designs that can be well applied to the construction of social buildings as required by the Program.
In this paper, the authors present a technical assessment about prefabricated buildings with 5 stories and 9 stories designed and constructed by the Vinaconex Xuan Mai company in terms of architecture, structure, foundation, technical systems and materials used.

Analysis of technical – economical and social features of some housing models for workers, students and low-income people (pp. 10-17)
Dr. nguyen huyen, Arch. TRINH ANH TUAN, Arch. TRINH THU HUONG
To implement the policy by the Vietnamese Party and State about social housing problem for workers, students and low-income people living in the urban areas, Ministry of Construction has issued some housing  models for workers, students and low-income people according to the decisions No. 131/QD-BXD and 14/2008/QD-BXD.
In this paper, the authors present  an analysis about technical – economical- social features of these housing models in order to point out the feasibility of applying these models to the construction of buildings for the above occupants.

Studying the temperature to burn ancient bricks used to build the Phu Dien Champa tower in Thua Thien Hue province (pp.18-24)
Dr. tran minh duc
The burning temperature applied to bricks in general and ancient bricks used for building Champa towers play an important  role  in ensuring the durability of bricks. At present, there are many different opinions about the burning temperature applied to Champa towers that are not consistent with the existing state of the brick. In addition, these opinions are not wholly agreed  in the process of restoration of bricks for conservation of ancient Champa towers.
In this paper, the author presents a study on the burning temperature applied to ancient bricks used for building the Champa towers in the past. The study was conducted during restoring the Phu Dien Champa tower that is located in Phu Dien commune, Phu Vang district, Thua Thien- Hue province.

The basis and some solutions of energy saving for the ventilation and air conditioning system
Dr. Vu van dai, Eng. nguyen le minh cong, Eng. doan van dong
Based on basic orientations on energy saving, which are applicable to the ventilation and air-conditioning system of buildings and constructions, the authors have studied and proposed some solutions on energy saving during the process of design and operation of the ventilation and air-conditioning system.
In addition, the authors have also proposed some orientations for exploiting clean energy sources used to supplement the traditional energy sources that are not satisfying the increasing demand of the mankind.

Analysis of early-age cracking in restrained ring specimens of high performance concrete using finite element method (pp. 30-35)
Dr. Nguyen quang phu, MEng. DO Viet Thang, Prof. jiang linhua, Prof. liu jiaping
When the use of high-performance concrete has increased, problems with early-age cracking have become prominent phenomenon. This paper is to present a numerical analytical study using a finite element method (FEM) to predict cracking of high-performance concrete in restrained ring specimens. This method estimates the residual stress development and quantifies the material’s potential for cracking with two concrete mixtures of the water-binder ratios are 0.22 and 0.40. The restrained ring test using FEM can be used to provide quantitative information on early-age cracking of high-performance concrete..
Studying and applying the technology of bioreactor to the treatment of urban waste in Vietnam (pp. 36-40)
MEng. nguyen son lam
Land fill (refuse disposal site) operated according to the technology of bioreactor  has been studied and widely applied in many countries all over the world such as the USA, England, Germany, Japan, Malaysia, Thailand,.. since the late 1990s and this technology has resulted in a high effectiveness in treating the urban solid waste.
In this paper, the author presents some experimental research results about treating the urban waste in Vietnam and some considerations that should be paid attention to when designing and operating this technology. The experimental research results show that bioreactor is the technology much suitable for treating urban solid waste in Vietnam.  

Calculation of plane perpendicular co-ordinate based on horizontal cylindrical gird with the same angle, using complex function (pp. 41-46)

Eng. Vu van doan, Eng. diem cong trang
Most of popular formulas for calculation of  plane perpendicular co-ordinate based on horizontal cylindrical gird with the same angle in Vietnam are based on expansion of exponential function of Taylor string. The shortcomings of formulae using exponential functions is its dependence on starting points of calculation of derivatives, number of terms of the string, the converging speed of the string as well as number of unused terms in string. Moreover, the accuracy of the result depends of the width of the segment of the grid.
By this article, the authors introduce the formulae using complex function to transform from surveying co-ordinate into plane perpendicular co-ordinate in order to make good to the above shortcomings, enhance accuracy and improve efficiency when it is applied to the real life.

Control the tilt of tower-shaped structures by external co-ordinate measuring method (pp. 48-51)
MEng. le van hung
In this paper, the author proposed the use of widely applied total stations with the external co-ordinate measuring method, in combination with the software Tilt OV for controlling the tilt of tower-shaped structures during the stages of construction, finishing and operation.
Measuring procedure, the accuracy, data processing, application of the software Tilt OV are presented in the paper in order to illustrate the application of this method.

Combination of vacuum preloading and electroosmotic for improvement of soft soil – an experimental study (pp. 52-60)

Prof.Dr
. Wang Baotian, MEng. Vu Manh Quynh
A laboratory test program was undertaken in order to study the combination of vacuum preloading and Electroosmotic for soft soil improvement. A testing apparatus and procedure was developed. Three test series were conducted on silty clay from Qinhuai River in Nanjing, China.

The apparatus is able to apply vacuum pressure at the bottom of soil sample and a direct current electric field simultaneously. The results of experiments have verified the effectiveness of the combined method for soft soil improvement. A substantial reduction in water content and increase in dry density as well as undrained shear strength in comparison with that obtained by vacuum preloading only would be expected, particularly close to the anode.

The combined method is suitable for reclamation projects like new disposal ponds where the horizontal configuration of cathodes beneath the soil ground is possible and the drainage pipes and PVDs system could be installed before the sludge dredged from seabed or riverbed is filled into the site.

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