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Micromorphological description of vernacular cob process and comparison with rammed earth

Frontiers of Architectural Research 2020年第1期9卷 203-215页

作者： Erwan Hamard Cécilia Cammas Blandine Lemercier Bogdan Cazacliu Jean-Claude Morel IFSTTAR MASTGPEMF-44344BouguenaisFrance INRAP UMR 5140AgroParisTechF-78850Thiverval-GrignonFrance UMR SAS AGROCAMPUS OUESTINRAF-35042RennesFrance Faculty of Engineering Environment and ComputingCentre for the Built and Natural EnvironmentCoventry UniversityCoventryCV15FBUK

Past builders have developed very low-embodied energy construction techniques optimizing the use of local building *** techniques are a source of inspiration for modern sustainable ***,this know-how was orally transmitted and was lost as earth construction fell into disuse during the 20th century in European *** absence of written documents makes necessary to use an archaeological approach in order to rediscover these construction *** analysis of thin sections collacted in earth building walls was used for the first time to describe cob construction technique and highlighted several typical pedofeatures allowing to clearly identifying this ***,a first comparison of the cob and rammed earth micromorphological features permitted to identify two key factors to distinguish these two techniques,the manufacturing state(solid or plastic)and the organization of the material in the wall.

关键词： Cob rammed earth Micromorphology Architectural heritage Pedology

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Site Test of Thermal Environment of rammed Earth Construction in Anji County of China

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Journal of Landscape Research 2012年第4期4卷 3-9页

作者：马金柱高璞许昌学院土木工程学院河南许昌461000 同济大学桥梁工程系上海200092

The scientific evaluation on heat insulation and preservation capacity of rammed earth construction can provide an effective evidence for its superiority in preserving thermal environment of the construction. By taking an eco-hotel in Zhejiang Anji County as the research object, 33 test points have been set. The indoor and outdoor air temperature of eco-hotel and the surface temperature of building envelopes had been recorded by using data acquisition instrument, temperature transmitter and other equipments from January 27 to February 2 in 2007. Then, the data of a period had been selected for comparison and analysis and the results had been obtained as follows. In January when the temperature difference between day and night in Anji was not large, without particular thermal insulation measures and equipments, the indoor temperature of eco-hotel fluctuated very little, showing that rammed earth construction was of obvious capacity for heat preservation and insulation, that its heat stability was evident and that it could ensure excellent indoor thermal environment.

关键词： rammed earth construction Indoor thermal environment Site test

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Experimental Study of Dynamic Characteristics on Composite Foundation with CFG Long Pile and rammed Cement-Soil Short Pile

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Open Journal of Civil Engineering 2014年第1期4卷 1-12页

作者： Jihui Ding Yanliang Cao Weiyu Wang Tuo Zhao Junhui Feng China Metallurgical Design and Research Institute Co. Ltd. Baoding China College of Civil Engineering Hebei University Baoding China Hebei Academy of Building Research Shijiazhuang China

Based on the idea of optimization design of pile type, the two kinds of the typical pile type are selected, which containing flexibility pile (e.g. rammed cement-soil pile is for short RCSP), and rigid pile (e.g. cement-flyash-gravel pile is for short CFGP). The three kinds of the composite foundation are designed, which are CFGP, CFG long pile and CFG short pile (for short CFGLP-CFGSP), CFG long-short pile and rammed cement-soil short pile (for short CFGLP-RCSSP). Natural earthquake is simulated by using the engineering blasting;the dynamic characteristics and dynamic response of the composite foundation are studied through field test. CFGLP-RCSSP is closed to linear relation. The bearing capacity of the four composite foundation of the CFGP, CFGLP-CFGSP, and CFGLP-RCSSP in the site are 225 kPa, 179 kPa, and 197 kPa, separately increases 150%, 98.8% and 119% compared to the natural foundation. The vibration main frequency is mainly depended on properties of foundation soil and piles between vibration source and measuring point, pilling load value. Horizontal vibration main frequency greater than the vertical vibration main frequency and the vertical vibration main frequency close to the first-order natural frequency of composite foundation. With the pilling load increasing, the CFGLP-RCSSP pile composite foundation combined frequency decreased. Under the same blast energy, the acceleration peak on the CFG pile composite foundation is less than CFGLP-CFGSP the corresponding values, as the load increases, the peak acceleration gently. CFG pile composite foundation is favorable on seismic. The distribution of peak acceleration is consistent within 4 m from pile top in the CFGLP_RCSSP composite foundation. The maximum of the horizontal acceleration peak along the pile body occurs at a distance of pile top 4 m or the pile top, and that of vertical acceleration peak occurred at a pile top.

关键词： Blasting Vibration CFG Pile rammed Cement-Soil Pile Combined Pile Composite Foundation Dynamic Characteristics

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Corrigendum to “Optimizing the evolution of strength for lime-stabilized rammed soil” [J Rock Mech Geotech Eng 11(2019)882-891]

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 212-212页

作者： Jair de Jesús Arrieta Baldovino Ronaldo Luis dos Santos Izzo Eclesielter Batista Moreira Juliana Lundgren Rose Department of Civil Construction Federal University of Technology-ParanaCampus CuritibaCuritibaBrazil

The authors regret that in the paper of Baldovino et al.(2019),published in Journal of Rock Mechanics and Geotechnical Engineering(JRMGE),Eq.(2)must be ***.(2)in the original paper describes a formula to calculate the unconfined compressive strength(q_u).But Authors wrote it as if it were the formula for calculating the split tensile strength(qt).To amend this error,Eq.(1)and Eq.(2)are the correct expressions for q_u and q_t measurements,respectively.

关键词： Corrigendum to J Rock Mech Geotech Eng 11 Optimizing the evolution of strength for lime-stabilized rammed soil

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Modern Spontaneous Evolution and Research Value of Construction System of Tibetan Dwellings in Aba County: A Case Study of Tieqiong Village in Waerma Town

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Journal of Landscape Research 2017年第3期9卷 94-100页

作者： CAO Yong School of Architecture and Design Southwest Jiaotong University

Based on the field survey of dwellings in Tieqiong Village of Waerma Town in Aba County, northwest Tibetan area of Sichuan Province, this paper firstly introduced main characteristics of the construction system in the structure, materials and structural system, and analyzed changes in construction practices of various dwellings from traditional to modern time. Finally, it summarized characteristics of spontaneous evolution and research value of the construction system of dwellings in the northwest Tibetan area of Sichuan Province, with rammed earth wooden dwellings in upper and middle Aba areas as representatives.

关键词： Tibetan Dwellings in Aba County rammed earth buildings Construction system Modern evolution

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