Rahul Kumar’s Post

Concrete fabric, or concrete cloth, is a high cement content material with fine aggregate that hardens when hydrated. It consists of a PVC top, dry concrete mix middle, and fibrous bottom layer. Acting like formwork, the fabric is unrolled, fixed, and hydrated, then concrete is pumped onto it, setting within 24-48 hours into a durable concrete layer. It is ideal for applications like lining canals and ditches, providing quick and effective reinforcement.

Concrete fabric, or concrete cloth, is a high cement content material with fine aggregate that hardens when hydrated. It consists of a PVC top, dry concrete mix middle, and fibrous bottom layer. Acting like formwork, the fabric is unrolled, fixed, and hydrated, then concrete is pumped onto it, setting within 24-48 hours into a durable concrete layer. It is ideal for applications like lining canals and ditches, providing quick and effective reinforcement. Check #mehrtashsoltani for more

Concrete Cube test A concrete cube test is when you take a sample of fresh concrete, let it cure and then test its compressive strength in a machine. By doing this, you can see if the concrete has been done properly and possibly find unwanted features of the concrete before you start to use it when building. Compressive strength is the ability of material or structure to carry the loads on its surface without any crack or deflection. A material under compression tends to reduce the size, while in tension, size elongates. Cube test is usually done on 7th and 28th day. After 7 days have passed, it should have gained 65% and on 28th day it should gain 100% strength. Size of cube: 150x150x150mm

Many finishers argue that use of a steel trowel prior to a broom finish is perfectly fine as the broom “reopens” the surface. This is not entirely true. In many cases the use of steel trowels on air entrained concrete not only knocks the air out of the surface cream creating adensified surface without the expansive/contractive characteristics of the underlying air entrained concrete, this means the broomed surface is essentially little strips of a differing material. Also this can create voids beneath the cream surface from bursting the air entrainment making the spongelike bubbles combine into underlying voids. This said I have found the use of a funny trowel or very early Fresno is fine, however only the most minimal amount of work with a steel trowel is acceptable and best practice is to use magnesium to attain a smooth surface cream prior to brooming. This can be done with a heffer or a resin followed by a well worn mag.

Why do we check for concrete temperature during casting? Temperature testing throughout the entire curing process is essential, including during casting. Ensuring optimal curing conditions for your concrete is critical. The hydration process can be drastically impacted if freshly placed concrete is exposed to temperatures that are too high or too low, compromising the strength development of a mix design. If the temperature is too low, the hydration of the cement will significantly slow down or completely stop until the temperature increases again, creating a reduction or end to strength development. On the other hand, if the temperature is too high, it will cause the concrete to have high early strength development but consequently gain less strength in the later stage, resulting in lower durability of the structure overall. By checking the temperature, you can take any necessary measures to cool or heat your concrete as it cures. This can also protect your concrete from cracking.

Creep and shrinkage of concrete • Creep and shrinkage are two physical properties of concrete that affect its long-term behavior. • Creep is the time-dependent deformation of concrete under sustained load, while shrinkage is the time-dependent decrease in volume of concrete due to drying or chemical reactions. • Creep and shrinkage are influenced by various factors such as stress level, moisture content, age of concrete, and type of cement. • Creep can be reduced by using high-strength concrete, reducing the water-cement ratio, and curing the concrete properly. • Shrinkage can be reduced by using shrinkage-reducing admixtures, minimizing the use of water in the concrete mix, and curing the concrete properly.

Concrete compaction is the process of reducing the volume of entrapped air in freshly placed concrete by consolidating it. It improves the overall quality of the concrete by eliminating voids, enhancing density, and promoting better bonding between the aggregates and cement paste. Compaction significantly contributes to the strength, durability, and longevity of concrete structures. By achieving proper compaction, you can also avoid the different types of cracks in concrete and enhance its overall lifespan.    There are several concrete compaction methods, each with its unique advantages and applications. Let's delve into each of them in the following sections. During concrete casting, a vibrator is important to ensure proper compaction of freshly poured concrete by removing air pockets and voids. This helps increase the concrete's density, strength, and durability while improving its bond with reinforcement bars. It also reduces defects like honeycombing and weak areas, leading to lower density and reduce strength. Captions are auto generated

M70 grade self-compacting concrete (SCC) is a type of high-strength concrete. Self-compacting concrete is a specialized type of concrete that has the ability to flow and compact under its own weight, without the need for external vibration. This property is achieved through the use of high-range water-reducing admixtures (superplasticizers) and sometimes viscosity-modifying agents. SCC is particularly useful in situations where traditional vibrated concrete might be difficult to place or where a high level of consolidation is required.

A simple easy to understand demonstration. very well executed. Young engineers and construction supervisors should get instant ideas of honeycomb and this clip explains it together with how to get rid of it. The learners should also try to get the knowledge of after effects if honeycombs are not removed and the corresponding loss of cohesive structure which promotes loss of tensile strength.