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What is lime mortar?
Lime-based mortars are typically used in the construction of older buildings, as they were more commonly used in the past before the development of cement-based mortars. Lime mortars have some advantages over cement-based mortars, including better breathability, which allows moisture to evaporate from the wall more easily. This can be important in older buildings, where moisture trapped within the walls can lead to damage over time. Lime mortars also have a lower environmental impact than cement-based mortars, as the production of lime has a lower carbon footprint than the production of cement.
There are also some specific situations where lime-based mortars may be preferred over cement-based mortars. For example, lime mortars can be used to repair historic or heritage buildings, as they are more compatible with the original materials and construction methods used in these buildings. Lime mortars are also sometimes used in the construction of new buildings in areas with a high water table, as they are less prone to cracking due to the expansion and contraction of the mortar due to changes in moisture levels.
How much cement do I use to lay bricks?
The amount of cement needed to lay bricks depends on the size and type of bricks being used, as well as the size of the area being covered. As a general rule, it is recommended to use approximately half a bag of cement for every 100 bricks. This will typically yield enough cement to lay the bricks with a standard mortar joint of about 1/2 inch. However, it is always a good idea to have a little extra cement on hand, as the actual amount needed may vary depending on the specific project.
It is important to note that the ratio of cement to sand in the mortar mix can also affect the amount of cement needed. A standard mortar mix for laying bricks is typically made with a ratio of 1 part cement to 3 parts sand. If a stronger mix is needed, more cement may be used, while a weaker mix may require less cement. It is also important to ensure that the mortar is mixed properly, as a poorly mixed mortar may not provide adequate support for the bricks.
How much cement do I use for a concrete mix?
The amount of cement needed for a concrete mix will depend on the type of concrete being made, as well as the size and strength of the finished product. A standard concrete mix typically contains one part cement, two parts sand, and four parts aggregate (gravel or crushed stone). This mix is often referred to as a "1-2-4" mix.
To determine the amount of cement needed for a 1-2-4 mix, you can use the following formula:
Cement (in kilograms) = (Volume of Concrete in cubic meters) x (Ratio of cement to total volume of concrete)
For example, if you are making 1 cubic meter of concrete, and you want to use a 1-2-4 mix, the amount of cement you would need is:
1 cubic meter x (1 / 7) = 0.143 cubic meters of cement
Since there are approximately 400 kilograms of cement in 1 cubic meter, you would need 0.143 x 400 = 57.2 kilograms of cement for your mix.
It is important to note that the actual amount of cement needed may vary depending on the specific project and the desired strength of the concrete. It is always a good idea to have a little extra cement on hand, in case you need to adjust the mix.
What is mortar admix?
Mortar admix (admixture, feb or febmix) is a product that is added to mortar to improve its properties. Mortar is a mixture of cement, water, and sand that is used to hold building materials together. Admixes are added to mortar to give it specific properties that are beneficial for a particular application. For example, an admix might be added to improve the mortar's bonding strength, water resistance, or workability. Admixes can be added to both traditional mortar and masonry cement. They are available in both liquid and powder form and are typically used in small quantities, usually less than 10% of the total volume of the mortar.
There are many types of mortar admixes available, each with its own set of properties and benefits. Some common types include air-entraining admixtures, water-reducing admixtures, and plasticizers. It is important to choose the right mortar admix for your specific application, as using the wrong one can negatively impact the performance of the mortar.
What is the best sand for a concrete shed base?
Ballast is a type of coarse aggregate that is often used in the production of concrete. It is typically made up of crushed stone or gravel, and is used to provide a stable foundation for buildings and other structures. The use of ballast in concrete can help to increase the strength and stability of the finished product. However, it is important to note that ballast is not the only type of aggregate that can be used in concrete. Other types of aggregates, such as sand, gravel, and crushed stone, can also be used in the production of concrete. The specific type of aggregate that is best to use in a particular application will depend on a variety of factors, including the strength and durability requirements of the finished product, the availability of different types of aggregate, and the cost of the materials.How long does concrete take to dry?
The time it takes for concrete to dry will depend on a number of factors, including the type of concrete mix used, the ambient temperature and humidity, and the thickness of the concrete slab. In general, concrete takes about 24 to 48 hours to dry sufficiently for light foot traffic. However, it can take up to several weeks for concrete to fully cure, or reach its maximum strength. During the curing process, the concrete should be kept moist by misting it with water or covering it with a curing compound or wet burlap. This helps to ensure that the concrete develops its maximum strength and durability.When can I lay a floor over new concrete?
The amount of time you should wait before laying a floor over new concrete or screed will depend on a number of factors, including the thickness of the slab, the ambient temperature and humidity, and the type of flooring material you are using. In general, it is recommended to wait at least 28 days before laying a floor over new concrete or screed. This allows the concrete or screed to fully cure and reach its maximum strength.
If you are laying a floor over new screed, it is important to ensure that the screed is completely dry before installing the flooring. Screed can take longer to dry than concrete, so it is important to be patient and allow it sufficient time to dry. You can check the moisture content of the screed using a moisture meter or by conducting a simple calcium chloride test.
It is also a good idea to test the moisture content of the concrete or screed before installing the flooring. This can help to ensure that the substrate is dry enough to accept the flooring material. If the moisture content is too high, it may be necessary to wait longer before installing the flooring or to use a moisture barrier to protect the flooring from moisture.
What does “green” concrete mean?
"Green" concrete refers to concrete that has recently been poured and is still in the process of curing. Concrete cures through a chemical process that involves the hydration of the cement, which causes it to harden and gain strength over time. The term "green" is used to describe concrete that has not yet fully cured, and is still in the process of hardening.
Green concrete is typically weaker and more porous than fully cured concrete, and is more susceptible to damage from water and other elements. It is important to handle green concrete with care and to protect it from damage while it is curing. For example, green concrete should not be exposed to heavy traffic or loads until it has fully cured.
What is shuttering?
Shuttering, also known as formwork, is a temporary structure used to support and shape wet concrete as it cures. It is typically made of wood, metal, or plastic, and is used to create the desired shape and finish for the finished concrete. Shuttering is an important part of the process of pouring concrete, as it helps to ensure that the concrete is poured and finished to the desired specification.
There are many different types of shuttering systems that can be used for pouring concrete, including:
1.Traditional timber shuttering: This type of shuttering is made of wooden boards and is held in place using nails or screws. It is a versatile and cost-effective option, but can be time-consuming to install and remove.
2.Metal panel shuttering: This type of shuttering is made of lightweight, prefabricated metal panels that are easy to install and remove. It is a popular choice for large commercial projects, as it is quick and efficient to use.
3.Plastic shuttering: This type of shuttering is made of lightweight plastic panels that are easy to handle and can be quickly assembled and disassembled. It is a popular choice for small-scale projects, as it is easy to transport and store.
Shuttering is typically left in place until the concrete has cured and reached its desired strength, after which it can be removed.
How to get shuttering off concrete easier?
If the concrete is yet to be poured, adding a strike release oil to the inside of the shuttering with help significantly when it comes to the removal process.
There are several ways to remove shuttering from concrete:
1.Wait for the concrete to cure: One of the easiest ways to remove shuttering is to simply wait for the concrete to cure. As the concrete cures, it will shrink slightly, which can help to loosen the shuttering.
2.Use a pry bar: You can use a pry bar to carefully lift the shuttering away from the concrete. Be careful not to damage the concrete as you remove the shuttering.
3.Tap the shuttering with a hammer: Gently tapping the shuttering with a hammer can help to loosen it from the concrete. Be sure to use a soft-headed hammer to avoid damaging the concrete.
4.Use a chisel: A chisel can be used to carefully cut the shuttering away from the concrete. Be sure to use a wood chisel rather than a metal one to avoid damaging the concrete.
5.Use a pressure washer: A pressure washer can be used to remove excess concrete and debris from the shuttering. This can make it easier to remove the shuttering without damaging the concrete.
How big can concrete pads be without expansion joints?
Concrete pads should have expansion joints if they are larger than 50 feet in any direction. Expansion joints are used to allow for expansion and contraction of the concrete due to temperature changes. Without expansion joints, the concrete could crack as it expands and contracts, which would weaken the structure and reduce its lifespan. If you are planning to build a concrete pad that is larger than 50 feet in any direction, you should include expansion joints at regular intervals to prevent cracking and ensure the long-term integrity of the pad.
