Paper 3: Impact of the Indoor Climate on the Performance of Building Materials Contaminated with Salt Mixtures

Abstract

Archaeological sites are essentially submitted to decay phenomena inherent on their history as well as the environment to which they are exposed after excavation. The history of such archaeological sites is particularly related to their long-term underground conservation conditions during which they were subject to salt migration into the architectural remains.

It is well known that soluble salts present in building materials can cause damage, mainly by producing stresses in the substrate. A lot of research has been done in the past concerning the behaviour of salts in built constructions. However, most studies include single salts, of which the deliquescence points are well documented, while in situ one mostly finds complex salt mixtures, which makes the conservation strategy much more intricate.

The environmental conditions to minimize damage of salt-laden porous building materials can be modelled using a computer program ECOS capable of predicting the crystallization behaviour of salt mixtures. To use the model data of quantitative salt analyses are required as input. The program is then able to predict from a thermodynamic point of view which minerals will exist in the solid state under specified climatic conditions.

This paper deals with the results of a systematic investigation of the salt contamination of the building materials of the Coudenberg site and a prediction of the behaviour of the salt mixture related to the actual climate, as part of the environmental assessment.     

论明代太祖朝的物质赏赐

朱元璋在起兵反元和君临天下期间对各阶层、各势力颁发过形形色色的物质赏赐。物质赏赐形式中赏功臣、赏周边国家和少数民族区域是主体,赏赐的物品除了金银外,还有农畜产品、手工业品、钱钞、宅第、田地、奴仆等。本文对白银在明初的角色做了分析,认为赏赐冠带内含精神赏赐的层面。最后总结物质赏赐在太祖朝的影响,赏赐得当,对加强贵族和臣属对皇室的向心力,稳定民间秩序起着重要作用。     

基于仰韶水泥的砂岩石窟裂隙灌浆材料物理力学特性研究

为寻找适宜砂岩石窟岩体裂隙灌浆的材料,进行了基于仰韶水泥的砂岩石窟岩体裂隙灌浆材料室内筛选。研究表明,以烧料礓石为胶凝材料,以偏高岭土、石英砂为填料的浆液可作为砂岩石窟裂隙灌浆的初选材料。进一步试验表明,当浆液材料添加总质量10%膨胀剂后,最优的配比为烧料礓石、偏高岭土、石英砂以质量比1∶0.6∶0.4,最佳水灰比为0.5~0.6。针对该配比的灌浆材料开展物理力学特性测试及耐候性试验,结果表明,该种配比的浆液结石体除具有孔隙率大、收缩小、强度好的特点外,还具有较好的抵御温湿度循环、冻融循环及盐碱侵蚀等的能力,是一种较为适宜的砂岩石窟裂隙灌浆材料。研究结果也可为类似石窟岩体裂隙灌浆材料的选择作参考。     

Cosmopolitics,border crossings and the complex museum

Collections documentation systems are powerful frameworks for organising, producing and controlling cultural knowledge. Drawing on the findings from the Australian Research Council Linkage project Reconceptualising Heritage Collections (University of Western Sydney and Powerhouse Museum, Sydney, Australia) and research undertaken using the museum’s Palestinian collections through wikis and focus groups with constituencies in Australia, Israel and Palestine, we illustrate the highly political and fluid nature of the meanings and values existent around objects; and how now, in a networked complex world, non-linear interactions are occurring across transnational borders. These interactions sit uneasily with conventional museum practice. The collections became visible mechanisms to confront the complex relations and politics of borders between the museum and everyday life. ‘Cosmopolitics’, in terms of its political, ethical, cosmological and transnational outlook along with cultural complexity, enables an exploration of the dynamics and the shifting borders of an emerging complex museum. Ideas for the future imaginary of these interactions are further explored through the pathway of chaos theory.     

None daring to make us afraid

ABSTRACT

J.W. Breyer, the young South African military administration's first game warden in Namibia, was based at Namutoni on the south-eastern margin of the Etosha pan. Breyer died a lonely death and a meticulous inventory was rendered of Breyer's estate. Viktor Franke, the German commander in south-western Africa, and Cocky Hahn, the second South African commissioner of native affairs stationed at Ondangwa, similarly left a visual record of their intimate surroundings. An itinerary of their material worlds and hence of colonialism in Namibia is here revealed using photographs and other evidence, highlighting some of the complexities of the cultural practices of colonial administration and policing in southern Africa.     

Artefactual Persons: The Relational Capacities of Persons and Things in the Practice of Excavation

A number of recent theories have argued that archaeological objects and data reflect the social and subjective interpretation of the archaeologists excavating them. These interpretative or post-processual approaches have importantly called into question the empirical assumption that the world exists as an object prior to interpretations that archaeologists give it. However this perspective fails to look at the ways in which the social and subjective factors are themselves constructed through fieldwork. In contrast to an approach that seeks to investigate how social and subjective factors 'determine' different kinds of archaeological objects, this article therefore examines the particular fieldwork practices and conventions through which an opposition between subjectivity and objectivity is itself created.     

Kingdoms of the Cameroon Grassfields

The three volumes considered here offer significant contributions to studies of African kingship and contribute to an emergent political anthropology of the Grassfields. Each adopts an approach on a sliding scale of emphasis on evidence and interpretation. Fardon takes a strongly evidence-based approach, reflecting recent methodological concerns in anthropology, which invites challenge and dialogue. Warnier presents an innovative methodological paradigm which emphasizes interpretation through observation of human action in engagement with material culture. Argenti takes the view that slave raiding underpins state formation and masquerades, and presents his own interpretations in that light. His approach resonates strongly with contemporary moral concerns about the Atlantic slave trade but lacks historical evidence.     

Lithic production,site formation and Middle Palaeolithic palimpsest analysis: in search of human occupation episodes at Abric del Pastor Stratigraphic Unit IV (Alicante,Spain)

We present the results of an exercise in Middle Palaeolithic palimpsest analysis geared toward the identification of human occupation episodes. It is based on a combined reading of the archaeosedimentary deposit and the archaeological record of Stratigraphic Unit IV from Abric del Pastor (Alcoy, Alicante, Spain), chronologically framed within MIS 4–5. A study of site formation processes coupled with archaeostratigraphic analysis of the lithic record incorporating Raw Material Units (RMU) and refits, as well as with combustion features and faunal remains enabled identification a minimum of 4 and a maximum of 6 human occupation episodes within lithostratigraphic units IVa, IVb and IVc. Through our data it reaches a high resolution temporal frame close to the ethnographic time scale, which constitutes a significant contribution for the knowledge of human occupations types and landscape use in the Mediterranean rim of the Iberian Peninsula during Middle Palaeolithic.     

Material Politics Facing Post-Truth: Speculation,Infrastructure, and Ecology in Turkey

Despite their imposing material presence, the values and harms stemming from the construction of infrastructural megaprojects remain speculative affairs in Istanbul, Turkey. This article distinguishes two modes of speculation pertaining to megaprojects that present different ethical and political possibilities, namely de-materialising and re-materialising speculation. Contributing to debates about material politics informed by Noortje Marres (Material Participation; Palgrave Macmillan, 2015) and William Connolly (The Fragility of Things; Duke University Press, 2013), our framework of de- and re-materialising speculation avoids isolating material and planetary agency to instead consider how their uncertainties and potentials play a role at the intersection with politico-economic life. Accordingly, we analyse the coalescence of ecological and democratic crises. In Turkey, populism’s anthropocentric construction of “the will of the people” exacerbates ecological collapse. But also, ecological collapse inspires a search for a politics and ethics that acknowledge human–nonhuman ecological entanglements. The contestation between de-and re-materialising speculation underscores possibilities and limitations of ecological politics in contexts of populism and post-truth.     

中国古代砖砌体力学性能研究综述

古代砖砌体建筑由于材料劣化、环境影响,材料特性及力学性能均受到不同程度的影响和损伤,为了保护历史文化的载体,结合古建筑材料获取原始且必要的数据,系统总结了古砖、传统灰浆的制备工艺和材料性能,简要归纳了古砖、传统灰浆和古砖砌体基本力学性能及其测试方法,对比分析了单砖和砌体抗压强度的差异以及古建筑砌体材料力学性能研究现状。并对今后古砌体如弹性模量等力学性能、古砌体材料及结构的损伤机理等的研究提出了展望或建议,可为砖石古建筑的修缮保护提供参考依据。