IM 2022 August 22 | Page 40

GROUND SUPPORT & ROCK REINFORCEMENT
Shotcrete being applied with Master Builders Solutions MasterLife300D crystalline capillary waterproofing admixture
costly for the maintenance spent on the road as well as the damage caused to the equipment .
Master Builders Solutions proposed the addition of MasterLife300D , a crystalline capillary waterproofing admixture , to the shotcrete mix in conjunction with MasterLife SF100 , a dry powdered silica fume . MasterLife300D admixture is an integral crystalline capillary waterproofing admixture for concrete . It is designed for use in above- and below-grade applications and reduces concrete permeability effectively allowing the shotcrete to breathe . By supplementing MasterLife300D with MasterLife SF100 , water penetration , and capillary absorption , is reduced due to the denser matrix structure and self-healing nature of hairline cracks . Both products are conveniently supplied in water-soluble bags , resulting in easy addition to shotcrete mixes whilst adding synthetic fibers .
A new project saw the addition of the MasterLife 300D by 2 % of weight of cementitious material , and MasterLife SF100 dosed at 20kg per / m 3 . It has been employed to combat weeping / damp troublesome ground conditions with a mining customer in South Australia ( 100
m 3 / week of shotcrete ) plus successfully used with another unnamed hard rock mine customer – 150 m 3 was applied to a geologically challenging area that was a critical infrastructure / transport route .
The MasterLife product family are a range of admixtures that provide resistance to deterioration caused by abrasion , corrosion of steel , alkali silica reaction , sulphate attack , and drying shrinkage cracking . MasterLife 300D works by reducing water penetration whilst allowing the concrete to breathe . It uses a crystalline capillary waterproofing system which effectively seals capillaries and heals hairline cracks to 0.4 mm after the concrete has passed the plastic state . MasterLife SF100 is an admixture which improves the hardened characteristics of concrete in two key ways . Firstly , it is a pozzolan which means that it reacts chemically with concrete to increase the amount of calcium silicate hydrate gel formed , thus improving the strength and impermeability of the concrete . Secondly , MasterLife SF100 is an ultrafine mineral that can physically fill voids between cement particles , therefore making the concrete dense and impermeable .
Customer benefits include a reduction in costs associated with road repairs ; maintenance on equipment reduced ; quality of shotcrete application improved in problematic damp areas ; ease of addition of the products to the mix as the
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