废旧橡胶对楼面保温隔声砂浆性能的影响

通过大量试验研究开发了兼具保温和隔声性能的楼面聚苯乙烯颗粒(EPS)砂浆.在保证EPS保温砂浆工作性能的基础上,选择废旧橡胶颗粒掺入砂浆中,研究其对EPS保温砂浆各种性能的影响,并已有工程应用实践.     

保温隔声砂浆的配制与施工技术

通过在砂浆中掺入废橡胶颗粒、空心漂珠与聚苯颗粒的"三掺"复合技术,利用橡胶颗粒的黏弹性和空心漂珠的复合效应,改善楼板的撞击声压,空心漂珠的空腔结构和EPS颗粒的性能保证了砂浆的保温性能,所配制的保温隔声砂浆体积稳定性较好、热工性能好、隔声性能好,能满足楼板隔音和保温的综合功能要求,在项目试点楼板中进行了应用和性能测试,结果能满足高品质住宅保温和隔声的综合功能要求,形成的保温隔声砂浆施工技术对于楼板保温隔声施工提供了参考。     

建筑楼面高抗裂混凝土保温隔声系统构造分析

近年来建筑节能和隔声的要求越来越高,目前保温隔声楼面的面层存在易开裂、平整度较差的状况。基于此,文章介绍了高抗裂混凝土楼面保温隔声系统主要材料的特点、系统构造及选用、系统的四大优点和工程应用及应用效果。该保温隔声系统的应用,不仅有效提高了楼面的保温隔声效果、改善了室内舒适度、解决了保温隔声楼面平整度低和易开裂等问题,还对提高建筑工程室内质量和推动绿色建材的发展具有积极的意义。     

隔声楼面施工技术

隔声减震垫是一种弹性闭孔结构的垫层材料,在楼板上铺设这种垫层材料能有效降低楼板撞击声压传播,满足使用要求。介绍隔声楼面的构造、施工质量控制要点。     

隔声楼面的施工技术

介绍了隔声楼面的构造、施工质量控制要点.隔声减震垫是一种弹性闭孔结构的垫层材料,在楼板上铺设这种垫层材料能有效降低楼板撞击声压传播,满足使用要求.     

隔声楼面施工工法

目前人们对隔声效果的要求越来越高,隔声楼面施工工法具有施工工艺简单、安装方便、施工工期短、综合成本低的特点。深圳某住宅采用该工法,运用PE膜、隔声垫、挤塑板等材料,按照规定的工艺流程和操作要点施工后。完全符合国家现行住宅一级隔声标准的要求。     

隔声砂浆楼板系统的性能研究

对隔声砂浆兼具找平和隔声功能,直接取代铺砖用的干硬性水泥砂浆的隔声砂浆楼板系统的材料性能、楼板隔声性能和长期使用性能进行研究。结果表明该隔声砂浆楼板隔声系统长期使用性能较差,易出现起拱起翘和空鼓断裂。建议隔声砂浆使用时,应在隔声砂浆层做C20以上的混凝土保护层。     

建筑隔声砂浆的性能研究

依据墙体空气声隔声基本原理,研制了一种隔声砂浆。通过变化隔声砂浆中不同添加剂及其不同用量的对比,分析了各种添加剂对隔声性能的影响。将隔声砂浆抹在隔声量较低的轻质墙体上,获得了提高隔声量的效果。隔声砂浆中添加了橡胶丝、硅粉及偶联剂、金属粉、苯丙乳液等添加剂,文章从微观角度分析了隔声砂浆的隔声机理及各种添加剂的作用。     

建筑隔声砂浆的性能研究

依据墙体空气声隔声基本原理,研制了一种隔声砂浆.通过变化隔声砂浆中不同添加剂及其不同用量的对比,分析了各种添加剂对隔声性能的影响.将隔声砂浆抹在隔声量较低的轻质墙体上,获得了提高隔声量的效果.隔声砂浆中添加了橡胶丝、硅粉及偶联剂、金属粉、苯丙乳液等添加剂,文章从微观角度分析了隔声砂浆的隔声机理及各种添加剂的作用.     

Preparation and characterisation of fly ash based geopolymer mortars

Geopolymer mortars with varying levels of sand aggregate were prepared and their physical and mechanical properties studied. The geopolymer binder to sand aggregate weight ratio was varied from 9 to 1. Compressive strength and Young’s modulus of the fly ash based geopolymer paste were 60 MPa and 2.27 GPa and these values did not change significantly with addition of up to 50 wt.% sand aggregate. Geopolymer binder exhibited strong bonding to the sand aggregate. Increasing sand content without increasing the amount of alkaline activator resulted in a decreasing level of geopolymerisation within the binder system.     

用于水泥沥青砂浆的聚羧酸减水剂的制备

采用聚乙二醇单甲醚(1000、2000)、甲基丙烯酸、阻聚剂、催化剂、引发剂、苯乙烯、丙烯酰胺和对苯乙烯磺酸钠合成了用于水泥沥青砂浆的聚羧酸减水剂.研究了酸醇摩尔比和苯乙烯、丙烯酰胺、对苯乙烯磺酸钠的用量对合成减水剂性能的影响.对聚羧酸减水剂配比进行了优化,进行了中试,制备了CA砂浆样板,并进行性能测试.用GPC对中试聚羧酸减水剂进行了表征.结果表明:大单体的制备及减水剂聚合工艺是可行的.最佳酸醇摩尔比为4.0:1.0,苯乙烯和丙烯酰胺的最佳用量均为3％,对苯乙烯磺酸钠用量以不超过3％为宜.掺该合成聚羧酸减水剂的CA砂浆性能良好,制备的CA砂浆样板基本无缺陷.     

Comparison of environmental impacts of building structures with in situ cast floors and with precast concrete floors

In this paper, the environmental impacts of two types of slab systems are studied. The first type, a concrete-based one-way spanning slab, is the most common solution in residential buildings in Spain. The second type, a hollow core slab floor, is increasingly becoming more used in buildings, but is not being broadly used in residential buildings as yet. The study is undertaken through the Life Cycle Analysis methodology, applying the EPS 2000 method. The assessment shows that the environmental impact of a building structure with precast concrete floors is 12.2% lower than that with in situ cast floors for the defined functional unit.     

Byzantine mortars of the Negev Desert

The choice of appropriate materials for restoration of historical buildings depends on scientific data from the analysis of materials used for the original construction. In this study the results of X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses of different Byzantine mortars from a church in the Negev Highlands, Israel, are considered. Moreover, the possibility for the production of lime in this area and its use as a mortar binder are discussed. It was concluded that the mortar for floor was prepared on the basis of local loess. The mortar for wall stonework contained lime as a binder.     

现浇混凝土楼板的加固与检验

结合某住宅楼工程现浇混凝土楼板加固实例,阐述了碳纤维布粘贴、裂缝注胶以及楼板厚度处理的工艺要点,对楼板挠度、裂缝宽度进行了检验性试验,并对试验结果作了简要分析,从而证明了碳纤维加固混凝土构件的可行性.     

Interaction of walls,floors and roofs

The specification of more realistic overall loads for structures makes it necessary to have detailed data on the behaviour of whole structures and the interaction of their elements. The author, who is head of the Components Division, UK Building Research Establishment and co-ordinator of CIB working commission W 18 on timber structures, discusses the considerations involved with special reference to timber-framed houses.     

Study of the substitution of limestone filler with pozzolanic additives in mortars

In this work several specimens of mortars were prepared with the addition of 5% fly ash and 5% perlite and their mechanical properties and porosity were tested and compared to those of mortars with no additives (reference sample).Specifically, it was studied the influence that these additives have on the elastic modulus and porosity of the mortars.After conducting chemical, mineralogical and granulometric analysis of additives, a series of measurements were made in fresh and hardened mortars. In fresh mortars, measurements were conducted according to the EN1015-2/3/8 Standards concerning flow value, wet bulk density, air content, water demand and water retention.In hardened mortars, the measurements were made in the age of 28 days. The rate of carbonation and the formation of hydraulic phases were investigated using XRD, scanning electron microscopy (SEM) and thermal analysis (DTA–TGA). Porosity and pore size distribution of mortars were investigated by mercury intrusion porosimetry. Compressive and bending strength and adhesion were measured according to the EN1015-11/12 Standards. Finally, the Young’s elastic modulus was measured in cylindrical specimens sized 50/100 mm (diameter/height) according to ASTM C469-02 Standard.The results of the present study indicated a differentiation in the microstructure of the mortars that can be contributed to the use of different additives, such as fly ash and perlite. The three materials proved to be compatible in their mechanical behavior and appropriate for construction use.The modulus of elasticity value is related to the ratio of compressive to flexural strength and in particular, with the increase of the value of the ratio, the value of the Young’s modulus of elasticity increases. The development of the microstructure represents a major parameter to improve existing mortars and to formulate new mortars.     

石蜡相变储能砂浆应用性能研究

相变控温储能材料可机敏控制混凝土结构温度裂缝,对石蜡相变砂浆的应用性能进行了研究。采用石蜡颗粒和石蜡乳液作相变材料配制相变储能砂浆,测试了相变储能砂浆的和易性能、不同龄期的抗折强度和抗压强度以及变形性能,并采用压汞法测试其微观孔结构。试验结果表明:石蜡乳液相变砂浆变形性能优于石蜡颗粒相变砂浆,但石蜡颗粒相变砂浆的和易性和强度均优于石蜡乳液相变砂浆,且石蜡颗粒相变砂浆的孔隙率小、孔结构更合理。     

设置TMD的大跨楼盖动力特性及人致振动分析

以采用调谐质量阻尼器(TMD)进行振动控制的某小学体育馆大跨楼盖为背景,分别在施工阶段和正常使用阶段对其进行了现场振动测试.施工阶段主要考虑质量增加对结构振动特性的影响,正常使用阶段重点考虑了人致振动的多种工况,并利用MIDAS/Gen有限元软件对TMD的减振效率进行了分析.结果表明:大跨楼盖的自振频率随着铺设面层以及...     

掺漂珠轻质砂浆表观密度和力学性能试验研究

研究了用漂珠等体积替代天然河砂制备轻质砂浆,替代比例为10%～40%。测试了漂珠掺量对轻质砂浆抗压、抗折强度、表观密度和吸水率的影响。研究结果表明,在砂浆中掺入漂珠可直接降低试块表观密度,最大降低幅度为15. 4%,可减轻自重335. 9 kg/m~3;漂珠掺量越大,砂浆抗压和抗折强度降低幅度也越大,早期降低幅度最高,28 d降低幅度减小;在40%掺量下,砂浆28 d抗压强度和抗折强度分别降低16. 3%和14. 6%。可见,使用漂珠替代一定体积天然河砂制备砂浆,可在不显著降低其力学强度的同时显著减轻材料自重。