The additives for concrete or cement play a vital role in the production of concrete and mortar quality in all segments of ready – mixed concrete industry, the manufacture of precast concrete, or elaborados in situ. They are some of the ingredients that, like cement, water, and aggregates, are added to the mix before or during mixing. They are mainly used to reduce the cost of production of concrete, to modify the hardening properties; to ensure the quality of concrete during mixing, transportation, placement, and curing; and to overcome certain emergency situations during specific operations and conditions.
3D Resources with its’ Mortar and concrete additives in Malaysia happens to be a foremost global supplier of specific chemicals for the construction industry. As front-runners in additive technology, they help develop concrete innovative solutions for practically any problem, requirement, or technical approach present in construction processes, providing specific and effective professional solutions for each project.
Today, concrete is the main material used in everything in construction. Its malleability, great versatility, and high resistance make it the perfect material for most of the structures and construction fundamentals irrespective of their size.
Despite all its good properties, concrete also has its own limitations and problems due to its physical and chemical nature. In order to avoid all these limitations, there are additives for concrete, which allow improving its characteristics to adapt them to the specific needs of a construction situation. Additives for concrete and mortar modify the characteristics of the material, therefore, it is necessary that their users are very careful since the inappropriate use of additives can have negative consequences on the structure. Multiple characteristics of concrete can be modified and as construction technology advances, new additives emerge to give it special characteristics of the material.
The most important types of additives are:
Liquid additives decrease the dynamic resistance of concrete, making it more plastic. This type of additive happens to be added to the concrete mix in the order of one liter/cubic meter of concrete shaped and saves on the use of cement of up to 15%, in addition to facilitating the thickening and workability of the concrete, through the reduction of the surface tension of water.
These additives reduce the curing speed of concrete, that is, increase its setting time. It is commonly used in situations where concrete is manufactured off-site and transporting and placing the concrete may take longer than usual.
Its use has a series of benefits, for example, the lessening of cracks in the concrete, better ease in density, and feasibility, in addition to dropping the penetrability of the concrete.
Additives that have the opposite function of retarders: they serve to make concrete settings faster, speeding up the construction procedure. It happens to be common to be used in works, with a very short term, or with a delay in delivery. They act by accelerating the chemical process of cement hydration, thus setting occurs faster, increasing the initial strength of the concrete and reducing the segregation of the material, in addition to reducing exudation.
They are used to create micro air bubbles into the concrete mix. This effect is needed, for instance, when it happens to be essential to increase the thermal resistance of the material such as in environments that are subjected to freezing temperatures. It also assists to combat the separation of concrete totals and the exudation of fluids.
These additives achieve a certain controlled expansion of the concrete, in cases where it is required to fill a void or to compensate for the contraction of the cement paste.
Additives to make waterproof concrete reducing permeability and capillarity. In addition to partial waterproofing, it increases the workability of concrete and mortars. Its consumption varies according to the amount of cement to be used in the mortar or concrete.