保证清水混凝土楼板质量的有效措施

针对目前抹灰工程的质量通病带来的不良后果，从改进混凝土楼板施工工艺入手，阐述了采用竹胶合模板双面找平法，免去上下初装修以达到清水混凝土楼板的效果。指出该工艺的实施具有良好的经济效益和社会效益。     

压型钢板-竹胶板组合楼板的力学性能试验研究

为拓宽竹材的应用范围,实现建筑结构构件材料和形式的多样化,本文在阐述竹材的构造和力学性能以及竹材改性产品的基础上提出了一种新型的组合楼板──将竹胶板与压型钢板用结构胶粘结成为压型钢板-竹胶板组合楼板,并针对这一新型组合楼板进行了试验研究及理论分析。以竹胶板厚度、芯部压型钢板厚度及组合楼板跨度为参数进行了6块组合楼板的力学性能试验。结果表明,压型钢板-竹胶板组合楼板的整体工作性能优良,竹胶板与钢板之间具有很好的组合效应,能够提供较高的承载力和刚度,其力学性能可以满足作为建筑楼板的需要。根据组合楼板在正常使用阶段的变形范围内呈现出理想弹性性能的试验结果,提出了组合楼板抗弯刚度的计算方法;根据破坏阶段的应力状态提出了组合楼板极限受弯承载力计算方法,据此计算的组合楼板跨中挠度及受弯承载力的计算值与试验值吻合较好。     

MUF共缩合树脂的研制

为缓解苯酚紧缺,进行了用三聚氰胺改性脲醛树脂(MUF树脂)取代酚醛树脂生产室外级胶合板的研究。考查了三聚氰胺用量、反应工艺条件及增粘剂对MUF树脂性能的影响。抽样做胶合板耐候性试验表明,MUF树脂可取代酚醛树脂。     

活化粉煤灰在PVC建筑模板中的应用

探讨了活化粉煤灰对PVC树脂的改性机制，研究了其用量对物料的加工挤出及对PVC建筑模板力学性能的影响。结果表明：活化粉煤灰的用量为30份时，物料的塑化和成型比较稳定，制得的PVC建筑模板综合力学性能较好。     

几种模板体系在EPR核电站中的应用

对EPR核电站工程结构特点进行研究,介绍各种类型模板特点,最后得出如下结论:对于内墙采用钢木大模板,质量轻、强度与刚度大、周转次数多、安装拆卸方便;对于HK厂房、HL2/3厂房外侧APC墙体采用塔式起重机提升悬臂模板,可以独立进行高空作业;对于与HK厂房、HL2/3厂房外侧APC墙体相对的内部墙体外侧,选用钢框胶合板模板与自制小平台共同使用,保证在极小操作空间完成模板安装、支撑及拆卸;对于内、外壳筒体施工,内壳墙体选用塔式起重机提升悬臂模板,外壳外侧与内壳一致,外壳内侧采用液压爬模系统,保证通过自身系统提升模板及平台。     

Properties of phenol‐formaldehyde resins prepared from phenol‐liquefied lignin

In this study, alkaline lignin (AL), dealkaline lignin (DAL), and lignin sulfonate (SL) were liquefied in phenol with sulfuric acid (H₂SO₄) or hydrochloric acid (HCl) as the catalyst. The phenol‐liquefied lignins were used as raw materials to prepare resol‐type phenol‐formaldehyde resins (PF) by reacting with formalin under alkaline conditions. The results show that phenol‐liquefied lignin‐based PF resins had shorter gel time at 135°C and had lower exothermic peak temperature during DSC heat‐scanning than that of normal PF resin. The thermo‐degradation of cured phenol‐liquefied lignin‐based PF resins was divided into four temperature regions, similar to the normal PF resin. When phenol‐liquefied lignin‐based PF resins were used for manufacturing plywood, most of them had the dry, warm water soaked, and repetitive boiling water soaked bonding strength fitting in the request of CNS 1349 standard for Type 1 plywood. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

谈竹胶板拼装定型大模板施工技术

以秦皇岛同和热电厂粉煤灰仓工程为例,结合自身工作实践,介绍了竹胶板拼装定型大模板施工技术,分别阐述了模板配制、安装、加固校正及表面处理等关键工序施工要点,并指出应注意的问题及竹胶板拼装大模板的优点,具有一定指导意义。     

An Architectural Chemistry

Protocell technology has a precedent in the innovative use of plastic in the 1960s, when chemistry first came up with an innovative new material that could be applied to architecture, interiors and product design. Omar Khan describes how at the Center for Architecture and Situated Technologies at the University at Buffalo in New York, he is developing a line of research that builds on the legacy of the 1960s and 1970s for soft materials and the capabilities of an elastic responsive architecture. Copyright © 2011 John Wiley & Sons, Ltd.     

豆基蛋白质胶粘剂改性及应用研究

为了降低豆基蛋白质胶粘剂的黏度、提高胶合板的耐沸水胶接强度和满足工业化的生产要求,对传统豆基蛋白质胶粘剂进行改性,并通过胶粘剂的黏度、pH值、凝胶时间、耐沸水胶接强度以及热分析结果等确定了改性剂的合理用量。然后以热压温度、热压时间、热压压力和涂胶量作为试验因素,以胶接强度作为考核指标,采用正交试验法优选出制备胶合板用改性豆基蛋白质胶粘剂的较佳工艺条件。结果表明:改性剂的合理用量(质量分数)是40%;胶合板的较佳热压工艺参数是热压温度140℃,热压时间5 min,热压压力1.2 MPa,双面涂胶量310 g/m2;在此较佳热压工艺条件下制备的胶合板,其耐沸水胶接强度较理想(为1.12 MPa),并且满足Ⅰ类胶合板的标准要求。     

Preparation of adhesive for bamboo plywood using concentrated papermaking black liquor directly

1INTRODUCTION Paperpulpandpapermakingindustryarethe importantlightindustry,however,thepollution concernedisserious,especiallytheharmofblack liquortoenvironmentisthemost.Therefore,the treatmentofblackliquorhasbecomeanimperative taskforpapermakingindustry[16].Atpresent,thecommonlyusedmethodsof treatmentofblackliquorarerecoveringligninby acidseparation[7],agglomerationandsepara tion[8],super filtration[9]andrecoveringalkaliby combustion[10]etc.However,thereallexistsome disadvantages,forexamp…