Cement composites with limestone dust and different grades of wood sawdust

This paper presents a parametric experimental study which investigates the potential use of limestone powder wastes (LPW) and wood sawdust wastes (WSW) combination for producing a lightweight composite as a building material. Some of the physical and mechanical properties of brick materials having various levels of LPW and WSW with different particle sizes are investigated. The obtained compressive strength, flexural strength, unit weight, ultrasonic pulse velocity (UPV) and water absorption values satisfy the relevant international standards. The results show the effect of high level replacement of WSW with LPW does not exhibit a sudden brittle fracture even beyond the failure loads, indicates high energy absorption capacity, reduce the unit weight dramatically and introduce a smoother surface compared to the current bricks in the market. It shows a potential to be used for walls, wooden board substitute, alternative to the concrete blocks, ceiling panels, sound barrier panels, absorption materials, etc. Recycling of unmanaged WSW and LPW as new brick material supplements appears to be viable solution not only to the environmental problem but also to the problem of the economic design of buildings.     

昆明市盘龙区砖厂安全生产现状及分析

通过对昆明市盘龙区37家砖（瓦）厂的现场调研及检查,通过对其存在的问题和安全隐患予以分析研究．并提出了整改措施与建议。     

Towards the recovery of extrinsic camera parameters from video records of sewer surveys

The aim of the work reported here is the recovery, from a single image taken inside a roughly cylindrical brick sewer pipe of diameter up to one meter, of the pose of the camera relative to the central axis of the pipe. It is shown that the vanishing point associated with the longitudinal mortar lines carries valuable information about the pose. A method for the automatic detection of this point is presented and used to analyse the camera rotations underlying a number of sewer survey videos. It is similarly shown how the angles between the images of the longitudinal lines can be used to recover information about camera pose. The techniques might form an active part of a more comprehensive image understanding system recovering the three-dimensional shape of a surveyed pipe from survey videos and/or be used as an experimental tool during the design of such a system. Received: 24 June 1997 / Accepted: 17 March 1998     

台达机电产品在砌块成型机上的应用

本文在介绍砌块机工艺原理的基础上，讨论台达机电产品的砌块机自动化集成应用，包括触摸屏HMI、可编程控制器PLC、变频器产品和简要展望砌块机行业的自动化发展方向。     

55m砖烟囱小角度切口爆破拆除

为了成功爆破拆除一座55m高的砖结构烟囱,根据周围环境、烟囱高度及其结构特点,选取了合适的爆破倾倒方向和合理的爆破参数,采用了精准的爆破起爆网路。在实际工程中,砖烟囱爆破切口圆心角多数在200°~220°,通过对烟囱倾倒需满足的条件进行计算,确定其满足条件的爆破圆心角范围。设计了小角度爆破切口,其对应圆心角为185°,并且在爆破前进行预处理。起爆后,烟囱按照设计方向顺利倾倒,取得了较好的爆破效果。振动监测结果均在安全允许范围内,验证了砖烟囱小角度切口爆破拆除的可行性,可为类似工程提供参考。     

Palm kernel shell as fuel for burning bricks

The use of an agricultural waste product, palm kernel shell, as a fuel for firing bricks is explored as a means of reducing environmental degradation and depletion of scarce firewood in Ghana. A simple but efficient methodology of clamp firing bricks using the new fuel is developed and tested. The resulting bricks are analysed for physical properties and suitability for construction use. The viability of palm kernel shell as a fuel for small-scale brick industries is considered. On etudie actuellement au Ghana les possibilites d'utilisation d'un dechet agricole, en l'occurrence, les coquilles de noix de palme, comme combustible dans les briqueteries; une telle solution permettrait de reduire la degradation de l'environnement et de diminuer l'appauvrissement des maigres reserves en bois de chauffage du pays. A cet effet, on met au point une methodologie simple mais efficace de cuisson des briques en brulant des dechets de coquilles de noix de palme. On analyse les proprietes physiques de ces briques et on verifie qu'elles conviennent a la construction. On etudie la viabilite de la coquille de noix de palme pour l'alimentation en combustible des petites briqueteries.     

70m砖烟囱定向爆破拆除及结果分析

爆破拆除一座 70m高的砖结构烟囱时 ,该烟囱没有按预期的方向倾倒。文中介绍了设计方案、实际爆破参数以及爆破效果 ,并对爆破中烟囱的实际倒塌结果与设计要求不一致的原因作了详细的分析。     

煤间接液化残渣制备免烧砖研究

论文以山西潞安煤基合成油示范项目煤间接液化过程中所产生的气化炉渣、热动力炉渣、除尘灰为制备免烧砖原材料,以生石灰、水泥为辅料,以石膏为激发剂,各原辅材料的重量比例为:气化炉渣35.6%,热动力炉渣32.4%,除尘灰14%,石灰8%,石膏4%,水泥6%,通过预搅拌、陈化、二次搅拌、成型、蒸汽养护、脱模出室分检等制备工序,在100℃蒸养下可制备出符合《非烧结砖垃圾尾矿砖》(JC/T 422-2007)标准和《蒸压灰砂砖》(GB11945-1999)标准要求的免烧砖。     

Materials decay and environmental attack in the Pio Palace at Carpi: A holistic approach for historical architectural surfaces conservation

Since the XIV century the Pio Palace in Carpi (MO, Italy) has been subjected to many additions and rearrangements and, in the last decades, to wide restoration works. Nevertheless the XVII century main portal has not been restored yet, due to its complex and peculiar surface alteration forms in comparison with the other parts of the building, and still suffers a deep decay and degradation by complex chemical-physical processes.     

矿渣砖防渗渠道的试验运用及观测分析

矿渣砖具有强度大、抗冻融性强、生产工艺简单、价格低、与水泥粘接性强的特点，是渠道防渗及各类水工建筑中可广泛应用的新型建筑材料。本文介绍了矿渣砖防渗渠道的试验运用及观测分析情况。