The most important factors are ambient temperature, relative humidity, sunlight, wind speed (affects water evaporation), demoulding time, and overall speed of work.

Setting time of cement used is a very important factor that affect concrete on site, during casting. It transportation within the site from the mixing point to where it is needed. To mitigate this, mobile concrete mixing equipment is required. Other factors are mentioned by @Zainab Kammouna.

The quality of concrete is an essential factor in construction projects as it determines the safety and durability of the structure. Therefore, it is necessary to ensure the quality of concrete during formwork, as it is the first step in the concrete construction process. Several critical factors can affect the quality of concrete during formwork.

The first critical factor affecting the quality of concrete during formwork is the formwork used. The formwork must support the weight of the concrete and any loads applied to it. It must also resist any moisture that may come into contact with it. If the formwork needs to be stronger, it can lead to cracking and a decrease in the strength of the concrete. To ensure the quality of the formwork, the material must be chosen carefully, and the formwork must be inspected and maintained regularly.

The second critical factor affecting the quality of concrete during formwork is the preparation of the formwork. The formwork must be clean and free of dust and dirt before the concrete is poured. Any debris left on the formwork can cause air bubbles in the concrete, which can weaken the strength of the concrete. To ensure that the formwork is clean, it should be washed with water and inspected for any dirt or debris.

The third critical factor is the curing of the concrete. The curing process helps the concrete to reach its full strength. The concrete can be strong and resistant to cracking if the curing process is done correctly. To ensure that the concrete is adequately cured, the formwork should be covered with plastic or other material, and the concrete should be kept moist.

The fourth critical factor is the admixtures used in the concrete. Admixtures are chemicals added to the concrete to improve its workability, strength, and durability. The concrete can be strong and prone to cracking if solid admixtures are used. To ensure that the admixtures are chosen for the proper purpose and are used in the right amounts, the admixtures must be tested and monitored.

The fifth critical factor is the temperature and humidity at the site. If the temperature and humidity are too high, the concrete can dry out and shrink, leading to cracking. To ensure that the temperature and humidity are kept at an optimal level, the formwork should be covered with a tarp or other material, and the area should be kept as cool and dry as possible.

In conclusion, several critical factors can affect the quality of concrete during formwork. These include the type of formwork used, the preparation of the formwork, the curing of the concrete, the admixtures used, and the temperature and humidity at the site. To ensure that the quality of the concrete is not compromised, these factors must be appropriately managed.

References:

Ehrlich, J. (2020). The 5 Critical Factors that Affect Quality of Concrete During Formwork. Retrieved from https://www.gharpedia.com/the-5-critical-factors-that-affect-quality-of-concrete-during-formwork

McGee, D. (2019). Five Factors Affecting Quality of Concrete During Formwork. Retrieved from https://www.cement.org/five-factors-affecting-quality-of-concrete-during-formwork

Mukhopadhyay, A. (2018). Factors Affecting Quality of Concrete During Formwork. Retrieved from https://www.theconstructor.org/concrete/concrete-formwork/factors-affecting-quality-of-concrete-during-formwork/7893/

Concrete is a fundamental component of many construction projects and forms the basis of a structure’s strength and integrity. The quality of the concrete is determined by the critical factors that affect it during formwork in construction projects. This essay will discuss the essential factors and how they can affect the quality of the concrete on-site. The first crucial factor is the type of concrete mix and its proportions. The concrete must be adequately proportioned to provide the desired strength and durability; too many or too few specific components can result in a weak concrete mix.

Additionally, the cement type and amount used should be appropriate for the project and environment; for instance, if the concrete is exposed to extreme temperatures, cement with a high heat resistance should be used. The mix must also be adequately prepared and applied; for instance, all components should be thoroughly mixed to ensure a homogenous, consistent mixture. Any lumps or clumps should be broken down before pouring. (Lin et al., 2017). The second critical factor is the formwork and its form-tightness. The formwork must be securely constructed to ensure that the concrete is contained and maintains its shape during the curing process. The formwork should be of the proper size and dimension to ensure the concrete is poured evenly, and the form-tightness should be checked before running; any open areas can cause the concrete not to be set correctly.

Additionally, any formwork should be reinforced with steel to ensure it does not buckle under the weight of the concrete. (Zhang et al., 2019). The third critical factor is the curing process. The curing of the concrete is essential for it to reach its full strength and durability. The curing process should not be rushed; it should be done in a controlled environment where the temperature and moisture levels are regulated. Additionally, the concrete should be covered with a damp material to ensure it does not dry out too quickly and crack. Proper curing also involves regularly monitoring the concrete, and any necessary repairs should be done (Iqbal et al., 2020).

To conclude, three critical factors affect the quality of concrete on-site during formwork in construction projects. These factors include the type of concrete mix and its proportions, the formwork, form-tightness, and the curing process. All three aspects should be carefully monitored and managed to ensure the best quality of the concrete.

References:

Iqbal, M. A., Ahsan, M., & Karimi, G. (2020). Control of curing process of concrete: A review. Construction and Building Materials, 248, 118382.

Lin, Y., Chen, S., & Li, Y. (2017). Research on the proportioning of high-strength concrete based on the differences in cement types. Materials and Structures, 50(8), 1–13.

Zhang, M., Yin, Y., Wang, Y., & Chai, C. (2019). Formwork design for concrete structures: A state-of-the-art review. International Journal of Advanced Structural Engineering, 11(2), 151–167.