building construction material

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building construction material

2010年8月8日星期日 Jointing and PointingJointing and pointing are used for the finish given to both the vertical and the horizontal joints in external faces of wall irrespective of whether the wall is of brick , block , solid or cavity construction

Brickwork or blockwork is jointed or pointed for 2 reasons:
To ensure that all horizontal and vertical mortar joints in external brickwork or blockwork are solidly filled with mortar to make them watertightFor decorative reasons . THe appearance of brickwork or blockwork can be varied considerably by the use of coloured mortar for pointing and by making the kointing and pointing recessed or protruding .
Differences between jointing and pointing Jointing is the finish of the mortar joints between bricks or blocks , in rbickwork or blockwork that is finished fairface example not subsequently covered with plaster rendering or other finishJointing is executed as the brickwork or blockwork is buildtPointing is the finish given to the joints by raking out to a depth of approximately 20mm and filling in one the face with a hard-setting cement mortar which could have a colour additiveThe mortar for pointing is a special mix of lime , cement and sand or stone dust chosen to produce a particular effect of colour and texturePointing is executed as an operation separate from bricklayingPointing can be applied to both new and old brickwork or blockwork发帖者building construction时间上午7:493 条评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到PinterestTypes of mortar1) cement mortar (cement-sand )
-1:3 -suitable for brickwork exposed conditions such as parapets and for brickwork in foundations.

2)Lime mortar (lime-sand )
-1:3 -for internal use olny

3)gauged mortars ( cement :lime :sand )

1:1:6-suitable for most conditions of severe exposure
1:2:9-suitable for most condition except those of severe exposure
1:3:12 -internal use olny

Mortar for general brickwork may be made from a mixture of cement , lime and sand .These mixtures combine the strength of cement with the plasticity of limeA rich mix of mortar is one in which there is a high proportion of matrix , that is lime or cement or both , to sand as in the 1:3 mix and a weak mix is one in which there is a low proportion of lime or cement to sand as in the mix 1:3:12The richer the mix of mortar the greater its compressive strength and the weaker the mix the greater the ability of the mortar to accommodate moisture or temperature movementsIf the mortar is weaker than the bricks , shrinkage cracks will tend to follow the joints of the brickwork , and these are resonably easy to make goodIf the mortar is stronger than the bricks , shringkage cracks will tend to be vertical through the joints and the bricks , thus weakening the fabric of the structure.
发帖者building construction时间上午3:08没有评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到PinterestMortar for brickwork and blockworkIt is essential that brickwork and blockwork be laid in true horizontal courses , and the olny way this can be done with bricks and blocks is to lay them on mortarMortar is a mixture of sand and lime or a mixture of sand and cement with or without limeProportioning of the material can be carried by volume or weightMortar should never be re-tempered , and shouls be used within 2 hours of mixing or be discardedFunctions of mortar
-To join the brickwork or blockwork of a wall into one solid mass , thus increasing its strength and stability
TO transfer the rensile comprresive and shear stresses uniformly between adjacent bricks or blocks
-TO transfer up any inequalities of the bricks or blocks
-To make the wall reasonably waterpoof and airproof under ordinary conditions

TO perform its fucntions , mortar must satisfy certain requirement :
It must have qdequate stregth , but not greater than that required for the design strengthIt must have good workabilityIt must retain plasticity long enough for the bricks to be laidIt must be durable over a long periodIt must band well to the bricksIt must be able to be produced at the economic cost.
发帖者building construction时间上午2:50没有评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到PinterestAdvantages and disadvantages of blockworkTHe main advantages of blockwork over brickwork are :
Labour saving (easy to cut , larger units )Easier fixing ( must take direct fixing of screws and nailsLower densityhigher termal insulation propertiesProvides a suitable key for plaster and cement renderingTHe main disadvantage are :
lower strengthLoss resistance to rain penetrationloadbearing properties less ( one- or two storey application )lower sound insulation properties .
发帖者building construction时间上午2:441 条评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到Pinterestblockwork bonding at junctionsConcrete blocks are laid in stretcherbond and joined to other walls by block bonding or by leaving metal ties or strips projecting from suitable bed courses .Mortar used in blockwork should be weaker than the material of the walling unit ,generally a 1:2:9 gauged mortar mix will be suitable for work above ground level .Because the block units are comparatively large , any settlement movement in a wall will show more abvious cracking in mortar joints发帖者building construction时间上午2:40没有评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到Pinterestblockwork bondingBlocks are made in various thicknesses to suit most wall requirement and are laid in strecther bondThin blocks , used for non-loadbearing partitions , are laid in strecther bond wit each block centred over and under blocks above and belowAt return angles , full blocks bond into the return wall in every other courseSo as not to disturb the full width bonding of blocks at angles , for the sake of stability , a short length of cut block is used as closer and infill blockThicker blocks are laid in off centre strecther bond with a three quarter length block at stop ends and sides of openingsTHe off centre strecther bond is acceptable with thicker blocks as it avoids the use of cut blocks to complete the bond at anglesConcrete blocks walls of specially produced blocks to be used as a fairface finish are bonded at angles to return walls with specially produced quoin blocks for the sake of appearanceTHe L shaped quoin blocks are made to continue the strecther bond around the angle into the return wallsQuoin blocks are little used for other than fairface work as they are liable to damage in handling and use and add considerably to the cost of materials and albour.QUoin block at angles发帖者building construction时间上午2:24没有评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到Pinterestmaterial for blocks1. Clay blocks
Standard size of 290mm long x 215mm high x 75 , 100 or 150mm width.5mm cavity block is intended primarily partitions150mm cavity block has been used for the inner skin of cavity walls , but also used in the warmer climates countries such as Malaysia as a single-leaf external walling with rendered and emulsioned finish
THey are made from selected brick clays that are press moulded and burntTHese hard , dense block are hollow to reduce shrinkage during firing and also to reduce their weight
THey are grooved to provide a key for plasterClay blocks are comparatively lightweight , do not suffer moisture movement , have goof resistence to damage by fire and poor thermal insulating properties2.Concrete blocks
Density of a concrete block gives an indication of its compressive strengthTHe greater the density , the stronger the blockClassification is by compressive strength categoties : 2.8 , 3.5 , 5 , 7 , 10 , 15, 20 and 35 N/mm squareDensity will also give an indication as to the termal conductivity and acounstic properties of a blockTHe lower the density , the lower is the thermal conductivity factors , whereas the higher the density , the greater is the reduction of airborne sound through the blockFor use as a facing material , a wide range of concrete blocks is manufactured from accurate fair face blocks to rough exposed aggregates finishes
Standard concrete blocks are manufacture as solid , hollow or cellular blocks from cement and either dense or lightweight aggregatesA cellular block has one or more holes or cavities that do not pass wholly through the blockA hollow block is one in which the holes pass through the blockThe thicker blocks are made with cavities or holes to reduce weight and drying shringkageThe most commonly used size of both dense and lightweight aggregate concrete blocks is 440mm long x 215mm highThe height of the block is chosen to coincide with three courses of brick for the convenience of buildings in wall ties and also bonding to brickworkFor the leaces of cavity walls and internal loadbearing walls , 100mm thick concrete blocks are used .For non-loadbearing partition walls , 60 or 75mm thick concrete blocks are used .Concrete block or blockwork
发帖者building construction时间上午1:34没有评论: 通过电子邮件发送BlogThis!共享给 Twitter共享给 Facebook分享到Pinterest 较旧的博文主页订阅博文 (Atom)关注者博客归档 2010(184) 八月(34)Jointing and PointingTypes of mortarMortar for brickwork and blockworkAdvantages and disadvantages of blockworkblockwork bonding at junctionsblockwork bondingmaterial for blocksblock and blockworkenglish bondbonding at angles or jambstypes of bondingtypes of brickwork bondingTypes of brickwork bondingbrickwork terminologyCutting bricksbrickwork bondingBrickwork bondingcellular bricksClassification based on types of bricksclassification based on qualitiesbrick classificationbrickBrick and brickworkMaterial for dpcsDunction and position of dpcsDamp Proof Courses (DPCs)Types of wallswallswallsphysical considerationsphysical considerationsenvironmental considerationenvironmental considerationsBuilding enviroment 七月(120) 六月(30)我的简介building construction查看我的完整个人资料

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