Rapid urbanization and the construction of new and improved infrastructure have necessitated using huge amounts of concrete China and India produce approximately billion tons of concrete annually [1] Globally over 30 billion tons of river sand are consumed each year posing environmental threats due to the depletion of raw materials [2 3] In 2015 around
Due to the impact of economic and social development on the environment there is an increasing demand for manufactured sand to replace natural sand as fine aggregate for concrete At the same time the effect of admixtures on the rheological properties and compressive strength of concrete is crucial in civil engineering applications In this study with
Discipline Construction Chongqing Municipality Key Discipline Mechanical Engineering first level discipline master degree program Traffic Construction and Equipment Innovation Talents Cultivation Experiment Zone Students Awards in Science and
F 40 2004 "Technical specifications for construction of highway asphalt pavements" the median value of the the bonding strength of the repaired concrete When the sand filling depth reaches 14 mm the bonding strength Bonding behaiour and failure mechanism of damaged cement concrete repaired using epoxy based concrete Ceramics
Arch bridges provide significant technical and economic benefits under suitable conditions In particular concrete filled steel tubular CFST arch bridges and steel reinforced concrete SRC arch bridges are two types of arch bridges that have gained great economic competitiveness and span growth potential due to advancements in construction technology
This paper investigated the properties of sulphoaluminate cement based reactive powder concrete RPC incorporated with nano CaCO3 NC including setting time fluidity strength hydration and
This paper investigated the properties of sulphoaluminate cement based reactive powder concrete RPC incorporated with nano CaCO3 NC including setting time fluidity strength hydration and
The challenging issue of demand for sand in concrete can be addressed by exploring alternative materials Mechanism sand [12] aeolian sand [13] waste foundry sand [14] construction demolition waste [15] industrial by products such as coal ash aged clay tailings copper tailings [16] [17] [18] and sea sand [19] are among the materials considered to
The mechanism sand is used to make up self compacting concrete and the effect of fly ash content to the shrinkage of self compacting concrete is researched by laboratory experiments Water to binder ratio is fixed and the fly ash content is variable at three levels which are 0% 20% 40%
Construction Engineering; Environment & Water Resources Engineering; First author surveyed of Chongqing urban current traffic system found out the cause of the traffic congestion and made an analysis on the data Secondly in accordance with the above results author used scientific methods such as city road system optimization traffic
Foam concrete as an important construction and building material mainly consists of small inner pores produced by preformed foam and foam walls the concrete surrounding the small inner
[1] Zhu Lang and Jia 2001 Production status and development of machine made sand[J] Mining and Metallurgy 38 42 Google Scholar [2] Qiu 2015 The influence of machine made sand particle shape and stone powder content on concrete performance[D] Shenzhen University Google Scholar [3] Ai Peng H and Hu C 2013
ZHANG Guang tian CHEN Zhao yang LIU on the Application and Improvement Measures of Siliceous Mechanism Sand Concrete[J] Construction Technology 2018 47 2 107 111 [19]
The results show that a cement content of 4% is optimal for the cement stabilized coal gangue which can be used for the light traffic base and heavy traffic subbase of class II and below highways
From January 11th to 13th 2021 a group of 5 experts led by Professor Lv Xuewei Deputy Dean of the College of Materials Science and Engineering Chongqing University including Professor Wang Chong Director of the Department of Building
This paper discusses an experimental work on concrete made from river and crushed sands such as quartzite granite gneiss marble dolomite basalt and limestone with an emphasis on physical mechanical and microstructural properties of fresh and hardened paper is completed by the formulation of three types of concrete with a constant
The Chongqing Hechuan section is kilometers long and opened to traffic in 2002 and the Wusheng Hechuan section is kilometers long and opened to traffic in 2005 Chongqing Traffic Engineering Supervision Consulting Co Ltd participates in the construction supervision work of the whole line
The particle size of construction sand is usually between and mm and to capture images of sand below mm requires a high resolution camera that can only maintain a small object
[25] JTG/T F30 2014 Technical rules for construction of Highway Cement Concrete Paveme nt[S] Beijing China People s Communications Press 15 20 in Chinese Go to reference in article Google Scholar [26] DB60/T 2917 2018 Specification for application of machine made sand concrete[S] Lanzh ou China 13 14 in Chinese Go to reference in article
From January 11th to 13th 2021 a group of 5 experts led by Professor Lv Xuewei Deputy Dean of the College of Materials Science and Engineering Chongqing University including Professor Wang Chong Director of the Department of Building
Concrete as a major building material is widely used in infrastructure projects and plays a vital role in the development and construction of modern society [1] River sand RS as one of the raw materials for the preparation of concrete [2] has been drastically depleted in recent years due to the massive development of infrastructure projects in various countries
