回弹法检测混凝土强度老是偏低？我们应该重点避开这些问题！ - 技术知识 - 服务支持 - 浙江天造环?？萍加邢薰?/title> <meta name="keywords" content="技术知识 - 服务支持 - ," /> <meta name="description" content=" 回弹的原理：回弹法是用一弹簧驱动的重锤，通过弹击杆（传力杆），弹击混凝土表面，并测出重锤反弹回来的距离，以回弹值（反弹距离与弹簧初始长度之比）作为与强度相关的指标，是基于混凝土表面硬度来推定混凝土" /> <link href="/template/default/images/css.css" rel="stylesheet" type="text/css" /> <LINK rel=stylesheet href="/template/default/images/home.css"> <SCRIPT src="/template/default/images/jquery-1.7.2.min.js"></SCRIPT> <SCRIPT src="/template/default/images/jquery.SuperSlide.js"></SCRIPT> <script src="/template/default/js/wow.min.js"></script> <script type="text/javascript" src="/template/default/js/koala.min.1.5.js"></script> <script type="text/javascript" src="/template/default/images/jquery.zoomImgRollover.js"></script> <script type="text/javascript"> $(document).ready(function() { $(".testimg").zoomImgRollover();  }); </script> <script> new WOW().init(); </script> <script language="javascript"> function tabChange3(obj,id) { var arrayli3 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class="wz">您当前的位置：<a href="http://m.superkidsparty.com/">首页</a> > <a href="/index.php?catid=4" title="服务支持">服务支持</a> >> <a href="/index.php?catid=24" title="技术知识">技术知识</a></div> <div class="ej_lm1"> <ul> <li><a href="/index.php?catid=23">行业标准</a></li> <li><a class="on" href="/index.php?catid=24">技术知识</a></li> </ul> </div> <div class="clear"></div> </div> </div> <div class="ny_nr wow fadeInUp" data-wow-delay=".2s"> <div class="nr "> <span style="text-align:center">回弹法检测混凝土强度老是偏低？我们应该重点避开这些问题！</span> <div class="nr1 "> <b>发布时间：2020-03-24 09:07:30 来源：工程质量检测交流浏览：<script type="text/javascript" src="/index.php?c=api&a=hits&id=85"></script>次</b></div> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="font-size:20px;"><strong><span style="color:#FFFFFF;background-color:#000000;">回弹的原理：</span></strong></span> </p> 回弹法是用一弹簧驱动的重锤，通过弹击杆（传力杆），弹击混凝土表面，并测出重锤反弹回来的距离，以回弹值（反弹距离与弹簧初始长度之比）作为与强度相关的指标，是基于混凝土表面硬度来推定混凝土强度的一种方法。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 回弹法检测混凝土强度具有设备简单、操作方便、测试迅速等特点，且不破坏混凝土结构，比其它检测方法具有更大优势。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> 但有时混凝土的回弹推定值很不均匀，变化没有规律性。存在以下几种情况： </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <strong>（1）同一工程设计同一强度等级的混凝土结构，采用同一配合比，不同部位的回弹值相差很大，匀质性很差。</strong> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <strong>（2）不同工程设计同一强度等级的混凝土结构，采用同一配合比，回弹值也相差很大。</strong> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <strong>（3）同一工程设计同一强度等级的混凝土结构，采用同一配合比，不同的施工时间，回弹值也存在相差很大，匀质性很差的情况。</strong> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <strong><span style="color:#FFFFFF;background-color:#000000;font-size:20px;">造成回弹法检测混凝土强度偏低的因素主要有：</span></strong> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#0052FF;"><strong>（1）回弹仪</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#0052FF;"><strong><br /> </strong></span> </p> 回弹仪的质量及其测试性能直接影响混凝土强度推定结果的准确性，影响回弹仪检测性能的主要因素有： <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong>1、指针摩擦力</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong>2、弹击锤脱钩位置</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong>3、弹击拉簧工作长度</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong>4、弹击锤的冲击长度</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong>5、弹击锤起跳位置等</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 在进行回弹检测前，应确保使用的回弹仪必须在有效检定期限内且处于标准状态。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 对于一次检测数量比较多时，应配备多台检验至标准状态的回弹仪，并随身携带标准钢钻，以备检测过程随时进行率定检测，适时更换回弹仪，以保证测试结果准确性。避免在检测过程中，对大批量构件进行连续弹击造成回弹仪的工作状态逐渐低于标准状态。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 比如，连续长时间弹击也会导致弹击锤起跳点和弹击锤脱钩点出现偏离，对检测结果造成很大偏差。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 回弹仪的指针在指针轴上长时间摩擦，得不到及时保养或检定，指针轴上（0-55分读数）会产生较大划痕导致这一段指针摩擦力过大，在混凝土构件上弹击时就会直接造成读数明显偏低，产生较大偏差。 <p> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#0052FF;"><strong>（2）检测构件的表面状态</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 回弹法是通过混凝土表面回弹值与混凝土抗压强度之间存在统计相关性来推定混凝土的体强度的一种表层测试技术，即回弹值反映的是混凝土表面10mm-15mm厚范围内的硬度。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 因此，混凝土表面的状态直接影响推定值准确性和合理性。<strong><span style="color:#FF2941;">测区应优先选择在混凝土浇筑侧面，所选测区相对平整和清洁</span></strong>，不存在蜂窝、麻面、浮浆和疏松层，必要时可用砂轮清除疏松层和杂物。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 当然，混凝土检测面也<strong><span style="color:#FF2941;">不能打磨过度</span></strong>，因为混凝土表面的浮浆和疏松层往往是很薄一层，打磨过度特别是低标号的混凝土容易导致起砂，反而使检测值出现偏差。<br /> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#0052FF;"><strong>（3）湿度</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong><br /> </strong></span> </p> 混凝土含水率会影响其表面的硬度，水对混凝土表面具有软化作用，<strong><span style="color:#FF2941;">混凝土表面含水率越高，表面硬度越低</span></strong>。在进行回弹检测时，最好在混凝土表面自然风干状态下进行检测。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#0052FF;"><strong>（4）浇筑养护</strong></span> </p> <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <span style="color:#FF2941;"><strong><br /> </strong></span> </p> 混凝土浇筑工程中振捣充分、均匀可以消除混凝土内部缺陷，提高硬化混凝土强度。<span style="color:#FF2941;"><strong>振捣不足，混凝土内部缺陷，气泡难以排出</strong></span>，造成回弹强度低。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> <span style="color:#FF2941;"><strong>振捣时间过长</strong></span>，使混凝土存在分层泌水现象，构件底部石子较多，回弹值偏高。<strong><span style="color:#FF2941;">表层水胶比较大</span></strong>，表面疏松，回弹值偏低。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 浇筑后的充分养护可以保证混凝土水泥水化的正常进行，强度持续增长。<strong><span style="color:#FF2941;">养护不足或者不养护造成表面失水</span></strong>，表面水泥颗粒水化停止，表面硬度降低，回弹强度低。 <p style="color:#333333;font-family:-apple-system-font, BlinkMacSystemFont, "font-size:17px;text-align:justify;background-color:#FFFFFF;"> <br /> </p> 例如，很多挡土墙体、柱子等竖向结构，<span style="color:#FF2941;"><strong>过早拆模</strong></span>，<strong><span style="color:#FF2941;">养护不足或不养护，造成表面粉化，</span></strong>发白，回弹值明显低于拆模较晚的结构。 <div class="nr2 "> <ul> <li> 上一条：<a href="/index.php?id=84">配合比设计的原则</a> ></li> <li> </li> </ul> </div> </div> </div> <div class="clear"></div> <div class="hei30"></div> <div class="clear"></div>  <div class="foot"> <div class="m"> <div class="left"> <h1>联系我们</h1> <h2>0578-2170900<br> </h2> <p>公司地址：浙江省丽水市经济开发区南明路866号（丽景民族工业园）<br/>传真：0578-2170900<br/>邮箱：nhb3150@163.com<br/></p> </div> <div class="contt"> <ul> <li> <h1>企业展示</h1> <p><a href="/index.php?catid=9">谦源建材</a></p> <p><a href="/index.php?catid=10">中建沥青</a></p> <p><a 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