Concrete Batching Methods: Comparison Between Weight Vs Volume Batching
Concrete batching methods have an important impact on the performance and construction results of concrete. Among the batching methods for concrete, two commonly used methods are weight batching and volume batching. Concrete batching methods are designed to ensure that the amount of each component in the concrete is accurate and to improve the practicality and construction efficiency of the concrete during construction, while reducing waste.
The volumetric batching method is a commonly used concrete batching method, which is particularly suitable for concrete production in small construction projects. In the volumetric batching method, the measurement of each material is done according to the volume. This method is relatively less accurate, but more convenient to use in some small projects. In the volumetric batching method, the volume of the material can be measured using tools such as measuring boxes or measuring buckets. For faster estimation, dosing bins are usually designed with a thinner and deeper top to improve loading efficiency. For cement, a bag of cement (50 kg) has a volume of about 35 liters, so a dosing box equal to the volume of a bag of cement or a multiple of it can be used to measure other materials.
The weight batching method is a more accurate method of concrete batching, where the individual raw materials are measured by weight. The weight batching method is often used in major projects because it provides more accurate batching results. In the weight batching method, a scale or other measuring tool is used to determine the weight of each component, including cement, fine aggregate, coarse aggregate and water. There are two common types of weight dosers, mechanical weighing dosers and electronic weighing dosers. Electronic weighing dosers are equipped with digital scales and load cells mounted on the hopper in order to accurately measure the weight of the concrete batch.
Manual, semi-automatic or fully automatic weight dosers can be used in the batching process. The manual version is suitable for small concrete production, while the semi-automatic and fully automatic versions are suitable for large concrete production projects. Fully automatic weight batching machines are very widely used in construction projects, often as a part of concrete mixing plants. Various types of concrete mixing plants are now offered in the market, including stationary, mobile, dry, wet, ready-mix and central mix concrete mixing plants.
In comparison, the weight batching method is more accurate than the volumetric batching method. Because in the volumetric batching method, there are voids in the granular material and it is difficult to measure its volume accurately. The weight batching method, on the other hand, can determine the amount of each component more accurately by measuring the weight of the raw material.
In addition, the weight dosage method is able to take into account the water content of the aggregates. The automatic weighing batching machine can measure the water content in the aggregate and adjust the amount of water and concrete according to the actual situation, so as to better control the batching quality.
In terms of compressive strength of concrete, concrete mixes prepared by the weight batching method outperform concrete mixes prepared by the volumetric batching method in terms of compressive strength at 7 and 28 days.
The concrete weight batching method is more accurate and reliable than the volumetric batching method, especially for large projects and for applications with high requirements for concrete quality. The choice of which batching method to use should be determined by the size of the project and the concrete production capacity.
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