Strength delayed concrete and application thereof to A/B occlusive piles

The invention provides strength delayed concrete and an application thereof in A/B occlusive piles. In terms of dosage per cubic meter, the strength delayed concrete is prepared from components as follows: 150-350 kg of cement, 180-190 kg of water, 600-900 kg of sand, 1100-1250 kg of pebbles, 50-100 kg of an admixture and 3-7 kg of a retarder. The strength of the strength delayed concrete is increased slowly at the early stage, 7d strength is just 30%-50% of designed strength value under the natural curing condition, 28d strength can reach 100% or higher of the designed strength value, workability is good, and pouring is compacter. With application of the strength delayed concrete to the A/B occlusive piles, a pile A can be subjected to rotary excavating and cutting smoothly, and requirements of the pile A for soil blocking and water stopping can be met. 本发明提供了种缓强混凝土及其在A/B咬合桩中的应用。本发明提供的缓强混凝土以单方用量计，包括以下含量的组分：水泥150～350kg；水180～190kg；砂600～900kg；石子1100～1250kg；掺合料50～100kg；缓凝剂3～7kg。本发明提供的缓强混凝土在初期强度增长缓慢，在自然养护条件下，7d强度