用磷酸 - 钢筋和焊丝网去除锈
编辑：添加了图片
Hi. I am in zone 4a and building a 28×80 post frame shop with concrete slab.
Is it ok to use Phosphoric Acid to remove rust from Welded Wire Mesh and Rebar?
My WWM and #4 rebar have sat in the weather for several months and there is a mild but complete layer of rust on WWM and spot locations on Rebar.
I have used Phosphoric Acid for rust removal many times on steel material with great success. So, I know it would be a piece of cake to use a garden sprayer to coat the reinforcement material and have zero rust a day later. However, since this will be in my concrete slab, I did not know if this will result in some bad outcome on concrete reinforcement.
笔记: the WWM will be used in the foot traffic area of shop and the #4 rebar will be used in equipment and vehicle traffic areas. `
这可能在这里的知识范围之外，但我以为我会问如果有人知道。我已经在线搜索了这个主题，对我来说，没有人想过同样的事情，这对我来说令人惊讶。
谢谢你。
-麦克风
GBA详细资料库
由气候和房屋部件组织的一千个建筑细节的集合
Replies
Mike,
You are fine leaving things alone. . Rebar with nothing more than surface rust actually adheres better to concrete. It's only when the corrosion reduces the bars to below their minimum dimensions that it is a problem.
Mike, I'd back up one step and ask "if there any problem if I leave the rust on?".
生锈无关紧要。当板坯倒入时，螺纹钢几乎是至少有一点生锈。一旦钢筋/ rerod被混凝土包裹，混凝土本身的化学就会防止材料的进一步生锈。
You can get rerod with a coating (I think an epoxy, but I'm not sure), but it's expensive. It's most commonly used in certain types of road and bridge construction, and it's typically light green in color. I've never seen it used on a residential project, or even most commerical buildings.
账单
账单, I'd be careful about claiming that concrete's chemistry will "prevent further rusting." It's true that if clean steel is used that the concrete will form a protective rust layer on the rebar, similar to Cor-Ten steel, but if the rebar is close enough to the surface that water, oxygen and/or salt can reach it, the rust will continue, expand and blow out the concrete. I see it occasionally on old foundations. More info here:https://www.ceame.org/learn/concrete-technology/durability/corrosion-of-embedded-材料
乔恩，
虽然我在骨骼中深入了解你的不适，但实际上说明钢筋不被拒绝表面锈病。钢筋对我来说很好。我总是讨厌网格在生锈时看起来的方式。我会采用样品并去除生锈并测量原始金属的直径并与规格进行比较。如果它已经失去了超过5-10％的区域，我会吃成本并更换。
我看过很多金属抛入混凝土，而我本来会对一些人反对，我不能说我看到它导致灾难性失败，至少在短期内。
典型的Rerod和Remesh不是世界上最优质的钢材制成的。这在大多数正常应用中，这不会产生任何实际差异，因为REROD /网格仅对混凝土提供一些额外的拉伸强度，否则这主要是压缩强大的材料（我自己在那里有:-)。
有更好的加固等级可用，那些就像预应力的混凝土梁和这样的东西一样进入更关键的事情。您不会在盒子存储中找到此内容，并且它将比您曾经习惯看到的那么高。
返回大学的路上，其中一个土木工程教授在碳纤维Rerod上进行测试。他们有一个大机器，将循环测试一段桥梁，直到它失败。我记得这是令人讨厌的，而那种机器由于“苍白......撕裂...... Wump ......”声音而运行，它会通过工程建设的地板携带。
账单
账单I disagree that rebar "only provides some extra tensile strength to the concrete." In some cases that's true, such as a pole barn slab. But in most cases, concrete and steel are equally important--concrete provides the compressive strength while rebar provides tensile strength. You can't build anything significant out of concrete alone.
There's nothing low-quality about rebar, despite its lowly appearance. It's not tempered, which does lead to more rusting. The commonly available type is grade 40, rated for 40,000 psi of tensile strength. The higher-strength type is grade 60, good for 60,000 psi. The tensile strength of unreinforced concrete is about 1/10 its compressive strength, or roughly 300 psi. In other words, the steel is 100 to 200 times stronger in tension than concrete.
这几乎是我打算说的话，钢铁提供了混凝土大多缺乏的抗压强度，但混凝土提供抗压强度。系统一起比单独的材料强。
这是真的，但对于正常加强材料的钢通常被认为是低级钢。这在这个应用程序中不是问题，但在其他应用中使用了更好的钢材。这可能只是看作识的差异，因为我最初来自更具航空航天的专注行业，那么他们的材料可能有点势利;-)
账单
Mikeysp,
在我的一个备用驱动器中的某个地方我有一个报告的副本，这些报告涵盖了生锈的钢筋是否对一般使用的强度有任何影响。我会在找到它的戳戳。基本上，它说没有。桥梁和高升高（和发射垫）是另一个全球游戏，如Zephyr笔记。