scholarly journals Compression Behaviour of Polypropylene Fibre Reinforced Cellular Light Weight Concrete Masonry Prism

2020 ◽  
Vol 30 (1) ◽  
pp. 145-160
Author(s):  
Ramalingam Vijayalakshmi ◽  
Srinivasan Ramanagopal
Keyword(s):  
Sustainable Development ◽  
Rural Areas ◽  
High Performance ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Low Cost ◽  
Polypropylene Fibre ◽  
Clay Bricks ◽  
Structural Applications ◽  
Urban And Rural Areas

AbstractSustainable development of the built environment in developing countries is a major challenge in the 21st century. The use of local materials in the construction of buildings is one of the potential ways to support sustainable development in both urban and rural areas where burnt clay bricks are used predominantly. This work focuses mainly on the use of polypropylene micro fibers in ordinary Cellular Lightweight Concrete blocks. The main objective is to develop a high-performance fibre reinforced cellular concrete to provide a better alternative than clay bricks for structural applications of masonry. This paper presents the stress-strain behaviour of polypropylene fibre reinforced Cellular Lightweight Concrete stack bonded prisms under axial compression. Masonry compressive strength is typically obtained by testing stack bonded prisms under compression normal to its bed joint. Use of micro-fibres enhances the pre-cracking behaviour of masonry by arresting cracks at micro-scale in the post-peak region. These efforts are necessary to ensure that CLC blocks become more accepted in the world of building materials and considered as a reliable option for providing low-cost housing.

Ecological Waste Treatment and Utilization Systems on Low-Cost, Energy-Saving/Generating and Resources Recoverable Technology for Water Pollution Control in China

1991 ◽  
Vol 24 (5) ◽  
pp. 9-19 ◽  
Author(s):  
Baozhen Wang
Keyword(s):  
Pollution Control ◽  
Rural Areas ◽  
Waste Treatment ◽  
Low Cost ◽  
Fish Ponds ◽  
Receiving Waters ◽  
Recoverable Resources ◽  
Urban And Rural Areas ◽  
Rice Fish ◽  
Utilization Of Wastes

Various ecological waste treatment and utilization systems (EWTUS) available in urban and rural areas in China are described, among which are land treatment and utilization systems (LTUS), eco-pond systems mainly consisting of macrohydrophytes-growing ponds, fish ponds and duck/geese ponds, and comprehensive circulation eco–systems for the treatment and utilization of wastes in rural areas, such as semi–closed eco–system in fish ponds, “rice–fish” and “rice–azolla–fish” symbiotic systems, recycling eco–systems with methane-generating digesters as central link, and comprehensive recycling eco–systems with digesters and eco–ponds as central link. In the various EWTUS, the sewage and wastewaters and other wastes are utilized and converted into various forms of recoverable resources and/or energy, while they are being purified to good quality effluents, meeting their respective discharge standards, and hence acceptable to receiving waters.

Environmental Friendly Ceramic Building Materials

2016 ◽  
Vol 690 ◽  
pp. 150-155 ◽  
Author(s):  
Toyohiko Sugiyama ◽  
Keiji Kusumoto ◽  
Masayoshi Ohashi ◽  
Akinori Kamiya
Keyword(s):  
High Performance ◽  
Building Materials ◽  
Bending Strength ◽  
Low Cost ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Heat Island ◽  
Solar Reflectance ◽  
Ceramic Building

The global warming is one of the most serious problems. The decrease of CO2 emissions in our daily life is an important subject today. Recently, an application of water retentive materials as a paving material has attracted a great deal of attention in Japan. This material is effective for reducing heat island phenomenon, which is also a recent problem in many cities in Japan. Water retained in the material during rainfall evaporates when heated by sunshine. The latent heat absorbed by evaporating water works to cool the surroundings. The water retentive ceramic products are expected to be useful for building materials as well as pavements. Several performances are required on the water retentive ceramics when it is used as building materials. Its cost and quality are the important factors. Porous ceramic materials formed by pressing without firing is one of ideal low cost and eco-friendly candidates. The porous ceramics is also expected to be produced from recycled ceramic materials. By optimizing its composition and forming method, a water retentive material with high performance was developed. The trial product had the properties as follows; fracture toughness: 1300N, bending strength: 175N/cm, water absorption: larger than 30%, and precision in size (length): +-0.5mm for 150mm. The product showed also enough frost resistance. In this paper, the fundamental properties of the porous ceramics prepared without firing are discussed with referring to the results of the field experiments.Another subject recently studied by several tile manufactures in Japan is the glazed tile with high solar reflectance. The exterior walls covered with such a high solar reflectance tile keeps the surface temperature of the wall lower under the strong sunshine of summer. It is effective against heat-island phenomenon. In this paper, the outline of the research results on visible and infrared reflectance of many kinds of glazes is also discussed.

INTEGRATED ECONOMIC AND ENVIRONMENTAL PLANNING AT THE SUBNATIONAL LEVEL IN ASIA

2000 ◽  
Vol 02 (03) ◽  
pp. 317-338
Author(s):  
PETER KING ◽  
DAVID ANNANDALE ◽  
JOHN BAILEY
Keyword(s):  
Sustainable Development ◽  
Case Studies ◽  
Latin American ◽  
Rural Areas ◽  
Environmental Planning ◽  
Success Factors ◽  
Planning Approach ◽  
The Common ◽  
American Case ◽  
Urban And Rural Areas

Throughout Asia, there is a commitment by governments to sustainable development, yet economic development continues to degrade the natural resources of the region and pollute the environment in both urban and rural areas. Current thinking about sustainable development suggests that planners and development specialists should attempt to integrate social, economic and environmental dimensions at all planning levels. This paper examines work undertaken by the Asian Development Bank over the last 15 years in the area of subnational integrated economic-cum-environmental (E-c-E) planning. It evaluates five subnational E-c-E plans against a model developed by the Organization of American States (OAS). The study found that the Asian case studies (and six earlier Latin American case studies) often have common failings. Improvement of the E-c-E planning approach, building on the common success factors and improving on the common weaknesses, is proposed. An improved E-c-E planning approach at all levels may be pivotal in contributing to sustainable development.

scholarly journals Assessing the Correlation between Brick Properties and Firing Hours of Locally Produced Clay-burnt Bricks in Taraba State, Nigeria

2021 ◽  
Vol 6 (1) ◽  
pp. 58-62
Author(s):  
E. J Bassah ◽  
W. K. Joshua
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Rural Areas ◽  
Low Cost ◽  
Mean Values ◽  
Clay Bricks ◽  
Unit Value ◽  
Study Results ◽  
Significant Difference ◽  
The Mean

The use of burnt-clay bricks is increasing in rural areas because of its availability and low cost. However, the burning of bricks locally at unknown temperatures will likely result in the production of bricks that are unfit for construction purposes. The study assesses the minimum number of days bricks require to attain the minimum stipulated standards for compressive strength and water absorption. The results obtained were compared to the NIS 87: 2000 standards to assess their conformity. From the study results, the mean compressive strength of bricks (1.576 N/mm², 2.306 N/mm², 3.634 N/mm²) at 48, 72 and 96 hours of firing fails to attain the target value of 5N/mm² as stipulated by the NIS building code. However, the mean compressive strength after 120 hours (5.386 N/mm²) attains the stipulated unit value. The water absorption rate displayed similar findings with mean values of 37.12%, 34.2%, 28.88% failing to conform with the stipulated 20% standards. However, the mean of water absorption after 120 hours (21.02%) has no significant difference and hence conforms to the stipulated value. This therefore means that bricks should be burnt far beyond the 120 hours in order to safely conform to 5N/mm² and 20% compressive strength and water absorption respectively.

scholarly journals Measurement and Path Selection of Rural Development Level in Enclave Areas: A Case Study of Jingyuan County, Gansu Province

2021 ◽  
Vol 13 (17) ◽  
pp. 9904
Author(s):  
Jianwu Qi ◽  
Wei Li ◽  
Zongxiang Wang ◽  
Haozhou Fang
Keyword(s):  
Sustainable Development ◽  
Rural Development ◽  
Spatial Data ◽  
Rural Areas ◽  
Path Selection ◽  
Gansu Province ◽  
Spatial Data Analysis ◽  
Development Level ◽  
Resource Endowment ◽  
Urban And Rural Areas

The development of rural areas is a significant component in social and economic activities. It is very important for optimizing the allocation of rural production and living factors, promoting the integration of urban and rural areas and sustainable development to identify the characteristics and main types of regional rural development. In this paper, 169 villages in Jingyuan County were selected as the research object, and the evaluation index system of rural development level was constructed from the perspective of “Factor-structure-function”. The rural development level and spatial structure characteristics of Jingyuan County were analyzed by using rural development index, regional function index, nearest neighbor index, and exploratory spatial data analysis, and the types and specific paths of rural development were determined. The results showed the following: Rural development of Jingyuan County is at a low level, which is characterized by “high in the south and low in the north”. The level of rural development shows significant spatial dependence in the global space, and the spatial agglomeration characteristics are obvious, which are manifested as strong agglomeration dominated by resource endowment and cultural function and weak agglomeration dominated by production function and location relationship. The local space is characterized by stable high value and high value (H-H), low value and low value (L-L) bidirectional agglomeration. According to the spatial characteristics of the rural development level, the “4 + 10 + 6 + 2” system of rural development type identification in Jingyuan County was constructed, and finally it was determined that policy leading and characteristic protection are the dominant types of rural development. Based on this, this paper put forward specific paths and development models of different types of rural development in Jingyuan County from seven dimensions: industry, population, land, tourism, space, culture and ecology, so as to provide ideas and references for the integration of urban and rural areas, the implementation of rural revitalization strategy, and sustainable development in the western poverty-stricken areas.

scholarly journals Rural revitalization under the background of balancing urban and rural development: A case study of Batang village, Guangdong province, China

2019 ◽  
Author(s):  
Weihong Guo ◽  
◽  
Bin Li ◽  
Yuquing Zhang ◽  
◽  
...  
Keyword(s):  
Sustainable Development ◽  
Rural Development ◽  
Rural Areas ◽  
Field Survey ◽  
Guangdong Province ◽  
Living Environment ◽  
Rural Practice ◽  
Development Mode ◽  
Rural Revitalization ◽  
Urban And Rural Areas

Since reform and opening up, the development of Chinese urban and rural areas has shown an evolution of integration from isolation. The government promulgated national policies and related planning strategies, aiming at realizing the goal of rural revitalization through the system reform and planning adjustment of balancing urban and rural development. In the complex process of social development, there are many problems with rural areas, such as lack of infrastructure, unbalanced economic development, dilapidated living environment and insufficient sharing between urban and rural areas. On the premise of meeting the requirements of national laws and policies, this paper takes the planning of Batang village in Yunfu city of Guangdong province as an example. Combine with ReBAM theory to make sure Batang village is suit for developing tourism. And based on field survey made a Batang plan by planning knowledge. Through literature review and field survey to explore how to realize the revitalization of the rural areas under the development mode of balancing urban and rural development. The conclusion of the research took rural tourism as the breakthrough point, and formed complementary and dislocation development mode with the city. In living aspect, the research optimized infrastructure and improved people's living environment as well as summarized cultural elements to inherit rural civilization. In production aspect, it exploited rural commercial potential and income-generating path, and completed the transformation from passive development to active revitalization to achieve prosperity industry and life. In ecology aspect, it combined with sustainable development model to create an ecological and livable rural landscape. At last, the research established urban and rural co-management system and shared rural information platform to achieve effective governance, to ensure that tourism mode as a starting point for rural revitalization planning can be sustainable development. The research of this paper practiced the national experience of rural revitalization as a pilot project, facilitated the implementation of relevant policies and supported planning for rural revitalization, and explored the methods of rural revitalization under the background of balancing urban and rural development. Based on the acceptance of the plan by local villagers, the approval of Guangdong Postgraduate Education Innovation Project in 2018 and got the third prize of National Competition for Ecological Wisdom Inspired Urban and Rural Practice in 2019, it is hoped that the research will contribute to the rural revitalization under the background of balancing urban and rural development.

scholarly journals Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2091 ◽  
Author(s):  
Malek Mohammad ◽  
Eyad Masad ◽  
Thomas Seers ◽  
Sami G. Al-Ghamdi
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
High Performance ◽  
Lightweight Concrete ◽  
Concrete Mixture ◽  
Unit Weight ◽  
Expanded Perlite ◽  
Micro Computed Tomography ◽  
Structural Applications

The aim of this experimental study is to develop high strength and lightweight concrete mixture suitable for structural applications. This work investigates the effect of replacing normal aggregate either partially or totally with expanded perlite aggregate. This material allows for better thermal insulation properties, thus decreasing the energy usage within the life cycle of the concrete structure. Expanded perlite aggregate was used in concrete by 20%, 40%, 60%, 80%, and 100% in replacement of the natural aggregate. Material characterization tests of compressive strength, flexural strength, and thermal conductivity were carried out for six concrete mixtures. In addition, microstructure analysis was performed with the aid of a micro-computed tomography system to investigate the effects and relation of microstructure quantities on material properties. The proposed concrete mixture, which has 100% of expanded perlite aggregate, has a unit weight of 1703 kg/m3 and achieved reduction percentage of thermal conductivity around 62% (1.81 to 0.69 W·m−1·K−1) and a compressive strength of 42 MPa at 28 days; and thus is ideal for structural applications with enhanced properties.

ANALYSIS AND RECOMMENDATIONS ON SANDY CLAY BRICKS WITH CEMENT MIX

2020 ◽  
Vol 92 (6) ◽  
pp. 99-112
Author(s):  
PHARAM SINGH THAPA ◽  
◽  
GOVIND PRASAD LAMICHHANE ◽  
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Cement Content ◽  
Low Cost ◽  
Clay Brick ◽  
Clay Bricks ◽  
Sandy Clay ◽  
Soil Cement ◽  
Structural Durability ◽  
Cement Strength

In order to contribute to the sustainability of the brick construction sector, this work studied the formation of economic and environment friendly sandy clay brick. Therefore, the goal was set to be developed, a “sandy clay brick with cement mix”, which has more structural durability, less weight, low cost, together with high performance with respect to indoor air quality. In this research, variation on soil – cement brick with gradual increase in cement content replacing soil material and how the soil- cement brick may be studied using soil and cement as binder by fulfilling the requirement of National Building Code (NBC). The water cement ratio was kept controlled and all other material properties used were same. The effect was seen on compressive strength because the 28 days strength of brick is slightly more when soil is replaced by 15% cement content then no replacement of soil by cement strength. Taking about 11 samples starting from 0 % to 50 % cement content it was found that sandy clay soil – cement brick with compressive strength up to 23.44 MPa with traditional value may be achieved.

Managed aquifer recharge: rediscovering nature as a leading edge technology

2010 ◽  
Vol 62 (10) ◽  
pp. 2338-2345 ◽  
Author(s):  
P. Dillon ◽  
S. Toze ◽  
D. Page ◽  
J. Vanderzalm ◽  
E. Bekele ◽  
...  
Keyword(s):  
Rural Areas ◽  
Low Cost ◽  
Leading Edge ◽  
Managed Aquifer Recharge ◽  
Aquifer Recharge ◽  
Water Supplies ◽  
Water And Wastewater Treatment ◽  
Urban Hydrogeology ◽  
Urban And Rural Areas ◽  
Treated Sewage Effluent

Use of Managed Aquifer Recharge (MAR) has rapidly increased in Australia, USA, and Europe in recent years as an efficient means of recycling stormwater or treated sewage effluent for non-potable and indirect potable reuse in urban and rural areas. Yet aquifers have been relied on knowingly for water storage and unwittingly for water treatment for millennia. Hence if ‘leading edge’ is defined as ‘the foremost part of a trend; a vanguard’, it would be misleading to claim managed aquifer recharge as a leading edge technology. However it has taken a significant investment in scientific research in recent years to demonstrate the effectiveness of aquifers as sustainable treatment systems to enable managed aquifer recharge to be recognised along side engineered treatment systems in water recycling. It is a ‘cross-over’ technology that is applicable to water and wastewater treatment and makes use of passive low energy processes to spectacularly reduce the energy requirements for water supply. It is robust within limits, has low cost, is suitable from village to city scale supplies, and offers as yet almost untapped opportunities for producing safe drinking water supplies where they do not yet exist. It will have an increasingly valued role in securing water supplies to sustain cities affected by climate change and population growth. However it is not a universal panacea and relies on the presence of suitable aquifers and sources of water together with effective governance to ensure human health and environment protection and water resources planning and management. This paper describes managed aquifer recharge, illustrates its use in Australia, outlining economics, guidelines and policies, and presents some of the knowledge about aquifer treatment processes that are revealing the latent value of aquifers as urban water infrastructure and provide a driver to improving our understanding of urban hydrogeology.

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