Injection product for fine sands and other porous matter

A batch injection product adapted to be directly injected into sands;

• and other porous matter, the product consisting essentially of a mixture of cement, an alkaline silicate, water and an agent inhibiting the reaction of the cement and the alkaline silicate with each other, the agent forming a compound with lime (CaO) which is less soluble than lime itself, and comprising an acid or alkaline salt of one of the following mineral or organic acids selected from the group consisting of carbonic, boric, phosphoric, tartaric, citric, malonic, malic, succinic, oxalic acids, wherein the weight ratio of silicate to cement is greater than 1 and wherein the product comprises from 20 to 200 kg inhibiting agent per m.sup.3 product.