Field Of Engineering Construction Research Articles

Configuration Analysis of Wage Payment Security for Migrant Workers in Engineering Construction Field

Configuration Analysis of Wage Payment Security for Migrant Workers in Engineering Construction Field

Utilization of Sugar Mill Waste Ash as Pozzolanic Material in Structural Mortar

Bagasse is produced as a waste in the sugar production process, which is used as fuel to stoke boilers in the sugar mills. The concluding product of this burning is residual sugarcane bagasse ash (BA), which is normally dumped or used as low-quality fertilizer. The ash for this study was collected from a reputed sugar mill located in the northern region of Bangladesh. Type I Portland cement (PC) was partially replaced with that finely ground bagasse ash without any pretreatment. The ground BA was used as a replacement for Portland cement at 5, 10, 15, 20, 25 and 30% of BA, respectively, in structural mortar. In addition, chemical characterization, specific gravity, X-ray diffraction (XRD), scanning electron microscopy (SEM), setting time, a strength activity index, compressive strength, water absorption, density and durability in a chloride environment of mortar were determined. The strength activity index result indicates that the used BA has the pozzolanic properties to be used as a partial cement replacement. The results showed that, at the age of 56 days, the mortar samples containing 5–15% ground bagasse ash had higher compressive strengths than the control mixture (mortar without ground bagasse ash). Mortar containing 15% ground bagasse ash had the highest mechanical and durability properties. Therefore, the substitution of 15% BA is acceptable for producing good quality structural mortar in the civil engineering construction field except in chloride environments.

Characteristic Strength of Concrete Using Steel Slag as a Fine Aggregate

Abstract: This paper describes the experimental inspection performed to evaluate the properties of concrete using steel slag as a fine aggregate. Concrete is the most commonly used material in the world, so it’s abounded used in civil engineering construction field leads to increasing in aggregate scarcity. Because it reduces the use of natural resources, industrial waste is encouraged in the construction industry. Common industrial waste materials include fly ash, silica fume, and steel slag. These materials are successfully used in the construction industry for partial and complete concrete replacement. In present study, partial replacement of fine aggregate by 0%,5%, 10% and 15% in M30 concrete grades with w/c ratio of 0.44. Keywords: Concrete, steel slag, compressive strength, split tensile strength and flexural strength test.

Performance of modified epoxy mortar using composite cement containing Ground Granulated Blast Furnace Slag (GGBS)

The applications of modified epoxy mortar have been widely used in civil engineering construction field to reduce the usage of epoxy in strengthening applications. In the construction field, the usage of epoxy resin mortar was known as repair materials. For this research, an experimental work has been conducted on modified mortar containing epoxy with and without hardener. This research was conducted to analyze the compressive strength, density and water absorption of the specimen. The cement used for this study was a composite cement with the combination of 50% ordinary Portland cement and 50% Ground Granulated Blast Slag (GGBS). The mortars were prepared with water-cement ratio of 0.60, sand-cement ratio of 2:1 and the epoxy content of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% and 100%. In this research, the type of epoxy used is Sikadur -31 CF Normal with and without hardener. The test was carried out by using cube mortar of size 50 mm x 50 mm x 50 mm. From the experimental results, the optimal percentage of epoxy content for compressive strength and water absorption was 3%. Besides, the highest compressive strength was 31.7 MPa of modified epoxy mortar without hardener and 34.8 MPa of modified epoxy mortar with hardener. It was concluded that 3 % of epoxy was the optimal percentage for the modified mortar because of the compressive strength reached the nearest with the control mortar specimen.

Exploration and practice of intelligent engineering in Dadu River hydropower construction

Abstract In view of the difficulties in promoting intelligent management in the field of engineering construction, based on the concept of intelligent enterprise and the actual situation of hydropower project-construction management, this paper puts forward the basic concept, main features and general idea of intelligent engineering. Based on a review of the exploration, pilot construction and comprehensive practice of intelligent engineering in the hydropower construction of Dadu River, the practical results of the intelligent engineering of Dagangshan, Houziyan, Shaping-II and Shuangjiangkou hydropower stations are summarized. The technical system and management model of engineering an early-warning decision centre, intelligent dam project, intelligent underground project, intelligent electromechanical project, intelligent security control, intelligent service guarantee, intelligent environmental and water protection, and intelligent resource control in Shuangjiangkou hydropower station are introduced. It is proposed that intelligent engineering is a high integration of information technology, industrial technology and management technology. And it is pointed out that intelligent engineering will lead in the new development of water conservancy and the hydropower industry, and even the engineering-construction field, throughout the world.

How to Construct the Structural System of Urban Underground Space Engineering Construction Standard

By combing the existing and relevant regulations and other standards of underground space development and utilization, this paper expounds the relationship between urban underground space engineering construction field and other areas of the term standard. Based on the integration study of the existing standards, the structure table of engineering construction standard is put forward. In addition, through the analysis of the combing standard of urban underground space engineering construction, the relevant technical standards for underground space are drew up and the scientific and operational characteristics of this system are confirmed.

Performance of Steel Fiber Reinforced Concrete (SFRC) and its Application in Civil Engineering

Steel fiber reinforced concrete is a new type of composite material developed rapidly in recent years. It is widely used in various types of engineering construction field with its good crack resistance, flexural toughness and impact resistance. Meanwhile, Steel fiber reinforced concrete has high tensile strength and fracture toughness, fatigue resistance, and forming pouring easy，for variety of complex stress position of the structure. This paper provides something for this new concrete materials in the project of the building structure design and construction, through the introduction of the main performance of steel fiber reinforced concrete.

Engineering Project Risk Evaluation System Construction and Research Based on BP Model

According to the status of the current engineering construction field in our country, in order to adapt to the requirements of engineering construction project risk evaluation, this paper discuss establishing a reasonable risk evalluation index system and a model of effective risk evaluation. By analyzing the advantages and disadvantages of the general model of risk evaluation, determine the risk evaluation model combined with BP neural network with AHP; secondly,establish a risk evaluation index system; once again,illustrate the method which represents the correlation between evaluation index system and the degree of risk; finally, establish a reasonable BP neural network model.Key Word:Evaluation index; Risk Evaluation ;AHP;BP Neural Network; Model Construction

Based on the Fuzzy Multi-Objective People Decision Method of Engineering Bidding Evaluation

The construction project bidding is a feasible method in engineering transactions and the main competition form of the construction activities under the conditions of the market economy. The bid assessment is an important link of bidding, and whether bid evaluation method is scientific or not, is directly related to the success of the tender. In the engineering construction field, at present the current commonly used evaluation methods are the comprehensive evaluation method and the lowest bidding price evaluation method. Based on fuzzy set theory and multi-objective people decision theory, we introduce fuzzy multi-objective people decision-making evaluation methods. And conducting research to put forward the evaluation index and weight method to determine the bidding decision model. Finally we apply it to actual case to make out the more standardized and scientific bidding evaluation method.

通気網解析技術の大空間を含む地下構築物への適用

In the civil engineering construction field, it is often necessary to determine the ventilation requirements in order to maintain a minimum air quality for human breathing. This needs to take into account dilution of natural gushed gas and the exhaust gases from diesel equipment, the gases produced by the detonation of explosives and their dissipation time, as well as the dust generated by shotcreting. The purpose of such a ventilation plan is to specify the capacity and optimum location of the ventilation equipment, both of which are calculated simply.Recent large-scale underground excavations such as power plant, energy storage, and so on, consist of complex lay-outs, deeply seated long openings, and substantial excavation volumes. Hence, they require rather sophisticated ventilation programs because of their huge pressure losses and air handling volumes.The authors have applied coalmine ventilation technology to optimize the ventilation plan for such large-scale underground civil constructions. A quasi-three-dimensional ventilation network analysis method has been developed and applied to analyze the airflow in large scale geo-spaces.