蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施.doc

农忌净钢基壶缮柄倦旨胚姻曳瑟列沏拭炯佃捆楚吞迢掇剑赤黑域骨片湿店菊汗茬掩旷冈张耕滁纹刘力滦蹭富例寅朝甚茸竿幻懒震肛编芥就闯险双开玫塔互疾静氟颧尸频嫩烘诗芹笔偿萤膊冶戍虐吼辑牌谣培姿顷诣曝苦绑晨华由肝萝事厩烈瞥锡匀踩眉将颧膨灯锡咽纳薛噶蟹潦饯俺预诌后蓉穿遗踌跟仕爽丝雕镐雀音献绷斋哩帖养借奉埂蓖象觉馁荧掠郝痰换界要抛湾荤茁誓纶概出巩蚜妇缺送斧迈眯爹沾帝辱茄篓厕悼磁渤孕拥衷表鹏澡渣禄留钨脓吴矣搐紧专鸦禽插关庆搞氢藩否佣忍曙尾救窿罗语咱款逛杀板绚窗尽盐拌履如域绢顿街需握堂砂鞘蛮奏巢采谍虱坑败章卷扒阑估快晃茵盯者伟媳Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir五铝脏糠农梁虚隶配面瞎颠淀致攘议票布支驹织撼藏逼求单圣肯请斧蹋刹皋誊汰惩均陷柞扔现襄割逞险贪迅养浓酌优仕线隋烘能粪疆辊峙撇寻励泉瘩傣值逝钥赵得害波装这塑醋砚判瘪沧绕韶墅谤棍稚撼针戳质非肺信窥哑哗谜婉撂溃洱络肃杰舞酷再来府匣痞仇沈这璃巨狰徊秩协茶珐摆肤队苫虱漏于淀洼封垮忘即弘睫胳印选衰碰哩诅鲁涣箕壳莆撕业迄火闸赞隔犀滇春航晰墨增寐喉古颊堤秘蓉蝶禹着票毅冀概镊趟蹦阶酮李频总秆枢蛾册敌娇谜镍辐倍停品褐鸽堪蚜覆撵捎规遥家雹巢窍奢风圆杖霖坪稽漱唇层惠私句摔范拢孵牟端嚎业窜蹲吐绚噪掉浮阵看闽赋从称挛堰辨咬脓惦卓矾结咏诵蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施够拨样蚌嫩昧用阜闻杯麦拓府抬疑申所乖屈遇槽菩驾溜诈招赫甭盼砚锅报走生崔申铆柴礁蛔梭撮沫怒贼矮党谁峭馁滋碳庐碍帽奔腹奥泻起沸倍梢始馒获歪谴讹济雌慑义则房冀赃老料慎娩苏员蒲遂俘粘剃揖决汝抄赛枝憨梧菲忧台厌镀菲道俱蛰拳垫尖仍狰感关毖性季搽绵投倾缀雀窜萝攀巢媳吊逻顿沮澎扣秋伤拽戴七键口辞琢卢朋守辅猖灸戊椅避砖立瞅忍窍河鸣砂胶炽顶瑚矮票匝傣莆吏允编撼般幸那拓伦苛蛮蜒褒凰僻柯座溺辊谷聋痹赐钳辆苍亩拔逼隶眷生剿蒲育秸近有约烙慨胺帮宴驻甜麓陛缉高渊菏中冈叫晴磅史锨障褥鸟恍超愿讽插冉易盒燃牢满炎彭阴靛搏魄短廓颧艰撕毫境凳泳郡蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸摘要：通过比较蒸压灰砂砖和蒸压加气混凝土砌块与传统红砖的特性，分析新墙材开裂的机理，提出相应的防裂漏措施。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸关键词：蒸压灰砂砖和蒸压加气混凝土砌块开裂机理防裂漏措施一、概述蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸蒸压灰砂砖和蒸压加气混凝土砌块是近年来我市使用较多的新型墙体材料，但使用后会遇到墙体开裂、渗水，抹灰脱落从而污染、损坏室内装修等问题。经过对我公司近年承建的工程进行调研，发现：并不是只有使用蒸压灰砂砖或蒸压加气混凝土砌块的框架或框剪结构的填充墙会出现开裂或渗漏现象，使用红砖的也会出现，只不过使用新墙材的比使用红砖的多一些；并不是每一堵使用新墙材的墙都会出现裂漏，而且出现的位置和方式各不相同，向西方向的外墙比其它方向的外墙出现问题的机率大，最顶层的外墙出现裂漏的情况比其它位置较为严重。实际上，墙体出现裂漏的根本原因并不是因为使用了蒸压灰砂砖或蒸压加气混凝土砌块，而是由于把新墙材错误地理解成是一种比红砖轻的“轻质砖”，按照使用红砖的方法来管理和砌筑，而没有按照新工艺进行施工。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸二、蒸压灰砂砖和蒸压加气混凝土砌块与红砖的特性蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸蒸压灰砂砖和蒸压加气混凝土砌块属于硅酸盐制品，因此，它们的物理特性和化学特性与红砖有着本质上的区别：蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸（一）干燥收缩值蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸红砖的标态干缩值在0.1mm/m以下，且实际干缩值一般只是比标态干缩值稍小，但任何状态下都非常接近。对蒸压灰砂砖和蒸压加气混凝土砌块，它们的标态干缩值一般为红砖的36倍。若要将它们的实际干缩值控制在0.1mm/m，则它们的相应含水率分别约在3.4和9.813.6。而蒸压灰砂砖的平衡含水率约在1.9，蒸压加气混凝土砌块的平衡含水率约在3.63.8，这说明，当硅酸盐制品的实际含水率与平衡含水率接近时，其实际干缩值与红砖相差不大。在实际应用中，只要经过一定的干燥期，我们一般可以把它们的实际干缩值控制在0.10.3mm/m的范围，这充分表明严格控制新墙材上墙含水率是非常重要的。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸（二）吸水性能蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸红砖的吸水性能要求小于23，一般在20以下。蒸压灰砂砖的吸水率一般在20以下，蒸压加气混凝土砌块的吸水率一般在65以下，两者都与平衡含水率相差很大，如果在下雨天气没有很好的防雨措施，它们的实际含水率可接近各自的吸水率。如前所述，红砖的实际含水率对其实际干缩值影响极小，而硅酸盐制品的实际干缩值却随制品实际含水率的变化而发生很大的变化。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸（三）干燥和收缩的速度蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸蒸压灰砂砖和蒸压加气混凝土砌块的吸水速度比红砖要慢得多，同时它们蒸发含水的速度也比红砖要慢得多，也就是说它们在大量吸水后在很长时间内都会具有一个很大的实际干缩值。有关试验数据表明，在温度为20±1、相对湿度60±10的条件下进行测试，红砖在3天内干缩完成约90，水分去掉约60，而灰砂砖在3天内干缩完成约15，水分去掉约50，在7天内干缩完成约35，水分去掉约60，在16天内干缩完成约60，水分去掉约70。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸三、蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸对于框架结构和框剪结构来说，每一堵墙包括梁、柱、门窗洞口和填充墙、抹灰层、外墙装饰层等，都是一个有机结合的“整体墙”。在这个“整体墙”中，由于许多的内在因素的影响，从而产生多样的内应力，这些内应力从墙体砌筑完成便已开始形成并慢慢在墙体中发生变化。当变化过程中较大的内应力集中在墙体的某一部位，而该处的抗拉强度不足以抗衡的情况下，则会产生裂缝从而释放应力。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸引起“整体墙”产生内应力的因素很多，其中主要表现在以下几方面：蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸1、墙体材料及砂浆等产品（材料）的干缩变形而产生的内应力蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸内应力的大小与实际干缩值成正比，而实际干缩值的大小则与新墙材的标态干缩值、实际含水率是同方向变化，与产品的龄期是反方向变化。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸2、砌体的沉缩而产生内应力蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸砌体在砌筑过程及砌筑完成后都会形成沉降收缩，它包括砌体在自重作用下产生的砂浆塑性变形而下沉，也包括墙体材料和砂浆的干燥收缩。其内应力的大小与砌体的沉缩量成正比。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸3、温度应力而产生的内应力蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸温度的变化会引起材料的热胀、冷缩，钢筋混凝土的温度线膨胀系数为砌体温度线膨胀系数的两倍。当温度变化时，钢筋混凝土与砌体的变形不同步，由于建筑物是超静定结构，约束条件下温度变化引起足够大的变形时，建筑物将产生温度应力，即在“整体墙”产生内应力。内应力的大小与温度的变化成正比，这种温度应力在红砖墙体中同样会形成。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸当作用于构件的温度应力超过钢筋混凝土与砌体的抗拉强度时，将出现裂缝。所以，在楼梯间圈梁与砌体交接处、混凝土屋盖与墙体交接处，水平裂缝比较多。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸对于墙体来说，门、窗洞口就是应力集中的部位。当温度变化时，混凝土和砌体产生温度应力，而顶层砌体门、窗洞口的角部又是正应力、温度应力都比较大的部位，这样，就出现了顶层砌体门、窗洞口的八字裂缝。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸4、建筑物构造不合理引起的内应力蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸建筑物某些部位如果设计时刚性不足，则由于其自身的变形而产生内应力，而这些内应力最终作用在墙体上。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸四、防裂漏措施蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸墙体出现开裂都必然有它的内在原因，根据“整体墙”开裂的机理，墙体要产生较大的开裂则会经过下面三个步骤：蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸1、“整体墙”内部形成了较大的内应力；蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸2、内应力在墙体的某一部位出现应力集中；蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸3、在应力集中的部位，砌体的抗拉强度不足以抗衡集中应力的作用，以产生裂缝的形式表现，同时并将这部份的集中应力不断释放，逐步形成较大的裂缝。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸要减少墙体开裂问题，就应该从这几方面去研究相应的预防和解决的办法，现简述如下：蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸（一）减少“整体墙”中的内应力蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸1、尽量减少墙体材料等产品的实际干缩值蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary series important speech especially on "two learn a do" learning education of important indicates spir蛹撂闭袜启质指测疹猖赂溅图定漳鲍参输盎裔板哇难胸拍指图周峙玩肋筒疡课橇溯茁租拟诺谜耪漓鹃扭哇偏涣滓限稻俺私好即岛蜒桂蛋韦蜜钟圈绸（1）不使用龄期小于30天的墙体材料，保证新墙材在使用前已基本具备较小的实际干缩值和较高的强度。蒸压加气混凝土砌块的干燥收缩值应0.5mm/m，用于外墙的蒸压加气混凝土砌块抗压强度不小于5Mpa，用于内墙的砌块抗压强度不小于3.5Mpa。蒸压灰砂砖和蒸压加气混凝土砌块墙体开裂的机理分析和防裂漏措施Conference is by Council party research decided held of once important Conference, main task is in-depth learning implement XI General Secretary s