Vitality of temperature control in grout-mix along with control of bleeding
- Vol.97(3), Mar
- Mumbai ACC LTD 2023
- 46-54p.
Cementitious grout refers to a predetermined proportion of cement and water used to fill narrow spaces in a variety of construction applications. Long span structures demanding long-term durability throughout their lifespan like pre-stressed bridge sand ducts, the strength, and durability of grout play an important role. Poor quality materials and grouting procedures render voids in the grout systems, eventually leading to premature tendons failure. Therefore, grout must have excellent fresh properties, to maintain the system’s integrity. Bleeding is one such characteristic that should be taken care of at all costs. Grout may be extremely sensitive to temperature changes, particularly when compressive strength is a concern. During temperature changes, casting and pouring concrete necessitate procedures that must be strictly followed and controlled to achieve the desired performance characteristics.
Admixtures including Cebex 100[9], Cebex 200[10], Cebex EN[11] have been introduced in cementitious grouts to improve their fresh state behaviour and studying their behavior towards temperature change to evaluate the strength and durability of grout mix including shrinkage. The study is to assess the efficacy of cementitious grouts for a major river bridge project in Goa, based on their dosage and additives.