Concrete laitance is a layer of weak and nondurable cement and fine particles originated from aggregate. These materials are moved upward due to movement of moisture (bleeding) through concrete because of the presence of too much mixing water.

Concrete laitance is a thin layer of cement with small aggregate particles that is weak and transitory. These components are transported upward due to moisture migration (bleeding) through concrete affected by the addition of too much mixing water. In this article you’ll learn: How to eliminate Laitance in Concrete Structures?

2022年11月19日 · Laitance is an accumulation of fine particles on the surface of fresh concrete due to an upward movement of water (as when excessive mixing water is used). It is also known as a milky deposition on the surface of new cement …

2021年2月3日 · When the concrete is curing, the concrete mix forms a thin layer or crust as it’s drying. One the surface of this is a layer called laitance. Laitance can be very thin or over 6mm upwards.

2014年4月7日 · What is Laitance? Laitance is caused by bleeding of concrete. In case of bleeding, only water accumulates at the top of the surface, but in case of laitance, along with water certain quantity of cement also comes to the surface, forming a …

2024年12月9日 · Laitance is a layer of cement and fine particles that is weak and not durable. It is formed when there is too much mixing water in concrete and moisture moves upward, causing the materials to rise to the surface (also known as bleeding).

Laitance is a weak, easily-crumbled layer on the surface of concrete, consisting of cement and fine aggregates that rise to the surface when too much water is added. Laitance may also be caused by over-trowelling, rain damage, or poor curing.

2020年1月10日 · What is laitance? Laitance always appears on every new concrete surface. It is the powdery, crumbly layer you see on the surface, which results from aggregates and cement rising atop when there is too much moisture or water added to the mix. Other causes of laitance include: Overworking the concrete; Poor curing process; Too much traffic on the ...

2021年7月6日 · Laitance is a major cause of failure in flooring installations. It takes the form of a weak, friable layer on the surface of concrete and sand cement screeds which appears after curing. It is made from cement and fine aggregates that …

Laitance is the weak, milky or powdery layer of cement dust, lime and sand fines that appear on the surface of concrete. These fines rise to the surface of concrete that was over-watered, or allowed to dry prematurely in the absence of curing membranes or other good curing practices. It may also form as a consequence of over-trowelling.