Hi

The Portland cement is the principal binding agent in concrete. The concrete fresh and hardened properties are all tied to the famous reaction between Portland cement and water which we call the hydration of cement. As cement is mixed with water, different phases of cement contribute in the formation of hydration products.

What controls the overall strength of concrete are the solid products which could be listed in order of their volume: C-S-H gel, portlandite, ettringite, and some minor compounds containing Mg and Fe. The rate and the quality of the formation of these compounds is the origin of concrete strength. They continue to form during the concrete lifetime, however, at a very slow rate after 365 days.

Amin

More hydration products, less voids in cement paste structure and this leads to increasing the strength of concrete.

The rate of hydration affects the speed of increase in mechanical strength over time, affects the phenomenon of scratches, plastic shrinkage, and the internal temperature of concrete.

The rate of cement hydration has an impact on the increase in strength of early concrete, affects the binding time of concrete components.

@İlker Yılmaz

So much hydrolysis goods, less hose in the structure of cement paste and this leads to increased concrete strength.

Cement hydration means binding materials hydrated and make a homogeneous paste which will impact on bond strength between Aggregates. More cement is hydrated after certain point, Strength will be reduced. If cement is hydrated quickly, then there is a possibility to reduce strength. So cement hydration has lots of impact on concrete properties.

Conference Paper Relationship Between Cement Characteristics, Heat of Hydrati...

The product of cement hydration (c-s-h) ponds with aggregates and sand to form strong matrix which responsible of the degree of strength gained with time. More hydrated cement in this matrix , less voids that leads to the high strength and good durability properties

The mechanical properties of concrete derives from several factors (type of cement, characteristics of aggregates, temperature, homogenization, cure etc.), and the water/cement ratio is extremely relevant.

For the formation of the molecule responsible for the resistance of the cement matrix (C-S-H), cement needs approximately 27% water (25% for its reactions; 2% for gel precipitation), where in addition to this, water is also required for absorption and adsorption of aggregates, plus that which contributes to homogenization ("rolling bol", in conventional concrete without surfactant additive).

Therefore, other water content will contribute to the formation of pores (voids) in the hardened state, being inversely proportional to the mechanical, elastic and durability-related properties.

Hydration of cement causes hardening and binding of the aggregate in the fresh concrete mix. Within the period of initial setting time, the hardening of the concrete matrix is restricted due to gypsum and the appearance of a metastable phase. In this period the concrete is liquid and shapable. After the initial setting time, the cement hydration surplus the metastable phase and reacts rapidly forming bonding between cement particles. The concrete goes to liquid to plastic phase and no longer suitable for shaping. Then continuous rapid hydration of cement causes the concrete to harden and the matrix started to gain its mechanical properties such as compressive strength which keep increasing over time.