Concrete Discoloration: Causes and Solutions! - Rule The Site. We can define Concrete discoloration as a shift away from the original color. Calcium chloride in the concrete, cement, and additives, as well as curing, weather, and lousy craftsmanship, can be the factors for this discoloration. However, we can reduce these sources of discoloration by taking action to lessen the effects of a contractor’s dark patches, strips, and blotchy concrete. After the concrete has fully cured, We can determine the best possible treatment based on the cause of the discoloration. Inconsistent Materials: In particular, consistency in mixed proportions is critical for preventing unpleasant color difficulties throughout the project. Disparities in the distribution of mixes from one batch to the next can make a concrete surface with a constant color problematic.
Moreover, the ready-mix supplier should provide a homogeneous concrete mixture. Adding water to concrete: We often add water to concrete to make it easier to work with at the construction site. Cleansing: 1. A Short Study on Concrete Retarder Types and Significance! Concrete Retarder: Retarders are substances that slow the setting period of cement paste and, consequently, the setting period of cement-containing materials such as mortar or concrete. Retarding admixtures or simply “retarders” are other names for concrete retarders. We can extended the setting time up to an hour by adding a retarder to the concrete mixture.
This gives workers more time to mix, transport, and put the concrete, slowing the hardening process in warmer climates. Retarders not only make the process go more slowly, but they also conserve water. Product from Amazon, Publisher may get a commission Rated ${ratingStringValue} out of 5 by ${reviewersStringValue} reviewers on Amazon.com Mechanism of Retardation: By dissolving a retarder in the mixing water or spraying it on the surface of the concrete, we can stop the hydration reactions momentarily, resulting in a longer resting period. I) Adsorption: Usually a retarding additive applies on the surfaces of the cement particles. 1. Different Types of Concrete Curing: Why and How? - Rule The Site. Concrete is a vital component of many different types of structures. Freshly poured concrete is plastic and needs time to solidify before it can reach the appropriate strength and durability.
Concrete curing, making concrete harder, entails creating appropriate circumstances for the chemical processes inside the concrete mixture. The critical process of concrete curing strongly impacts the performance and durability of the finished structure. The curing process can affect properties, including compressive strength, permeability, abrasion resistance, and durability. A proper cure can also reduce shrinkage, cracking, and other flaws that could jeopardize the concrete’s structural integrity. Furthermore, lack of proper curing will compromise the concrete’s strength and durability.It also helps concrete to maintains an appropriate temperature at its initial stages otherwise it’ll create crack on the concrete surfaces. We must execute it as soon as the placement and finishing are complete. Rule The Site Materials -
Compaction of fresh concrete: Fresh concrete can contain 5% to 20% confined air which may reduce theconcrete strengthand density. It’ll help to increase the permeability of concrete which will decrease the durability of the concrete. According to studies, the strength of concrete can be reduced up to 5% if only 1% of air void presents at fresh concrete, So, Compaction of fresh concrete is the process which will eliminate this air void from freshly placed concrete and help increasing density of concrete by binding the particles all together. It helps to increase the ultimate strength of the concrete and enhances the bond with reinforcements. Methods of compaction of concrete: Hand CompactionTamping Ramming Rodding Rolling Compaction Jolting Compaction Spinning Compaction Vibrating CompactionNeedle Vibrator/Immersion Vibrators/Poker Vibrator Surface Vibrators Formwork Vibrator Table Vibrator Vibration is a two-part process.
Spacing and Number of Insertion Position: Various Cement Tests: A Comprehensive Guide - Rule The Site. Cement is essential in the construction industry because it acts as a binding agent in concrete and mortar. It is subjected to various tests to ensure that it meets the criteria for quality and consistency. Cement tests are essential in establishing cement’s appropriateness for use in various applications. This article will review the different sorts of cement tests, their significance, and how they are carried out.
Understanding these tests is critical to ensuring that the cement used in your projects is of excellent quality, whether you are a construction professional or simply interested in learning more about cement. So, let’s take a deeper look at various kinds of cement test.The cement we use could degrade while being transported and stored before being used in a project. Cement Tests in the Field This Cement test is typically done when cement is used for small or insignificant projects. -The cement should be a greenish-grey color. Cement Tests for Laboratory 2. Test for Fineness. A Successful Plant Trial for Concrete Mix Design as per ACI 211.1: How to do? - Rule The Site. Syed Abid HassanPractitioner of Materials EngineeringM.Sc.
(JU), B.Sc. in Civil Engineering Recently we’ve done a successful plant trial for concrete mix design as per ACI 211.1 in our project which is one of the top megaprojects of Bangladesh. In this article, I tried to write down all the necessary things need to be done to achieve success for executing this type of work activities. 1) At first, we need to do moisture correction of fine and course aggregate accordingly to adjust the free water in the mix design.
If it exceeds the quantity limit of superplasticizer as per ACI 211.1, then we need to adjust the amount of superplasticizer with water in the mix design. 2) Then we need to produce atleast 3-4 cubic meters of concrete to observe the plant variations. 3) Before Batching: We should do the followings:A) recheck the mix design calculation, B) Make sure there is no remaining water in the plant mixture and transit mixture C) Also admixture tank stirrer well. 6) After Batching: Five On-site tests you should know as a Civil Engineer Materials. As a Civil Engineer, we often need to perform various tests on site. These tests help us to know about quality of materials and works. Every test has their own purposes to serve. Today we are going to discuss Five on-site test procedure that you should know as a civil engineer. Slump Test: The Concrete Slump Test is one of the most used tests at the site to measure the consistency of the fresh concrete before it sets.
We perform this test to check the workability and flow of freshly made concrete. To perform the test, we should place the cone on a hard non-absorbent surface. Then we should fill the cone with fresh concrete in three stages. The slump test has some its limitations. Soil Field Density Test: Soil Field Density Test or FDT is another common test procedure in construction. The most common procedure to perform FDT on the construction site is the sand cone procedure. Then, we make a hole where we want to perform the test. Where, Pile Integrity Test: Dye Penetration Test: A short study on Concrete Ingredients, Concrete Grade, Concrete mix ratio and its Classification. - Rule The Site.
Concrete is a construction material composed of fine and coarse aggregate bonded together with cement paste that hardens (cures) and gains certain strength over time.Latin word “concretus” (meaning compact or condensed) is the origin of the word concrete. Concrete Ingredients: Binding material: Binding material works to bind the coarse and fine aggregate together. Cement or Lime is a wonderful example of binding material.Fine aggregate: The main purpose of fine aggregate is to fill up the open space or gap between the coarse aggregate. we can use sand as fine aggregate to make concrete.Coarse aggregate: Coarse aggregate is the main load bearer component of concrete. Gravel, Crushed Stone, or such other materials work as coarse aggregate in concrete.Water: The main component for mixing up everything in concrete is water.
Concrete Grade: Concrete Mix Ratio: We use Cement, Sand, Aggregate, and Water for making concrete. Classification of concrete: According to the bulk density of the concrete: