| 摘要 |
oil and gas production. SUBSTANCE: mortar contains 100 wt parts of cement, 30-20 wt parts of water, and 20-30 wt parts of sodium nitrite-containing additive. The latter has density 1183 kg/cu.m and contains, wt %: sodium nitrite 15.2-22.3, sodium nitrate 0.69-1.96, sodium sulfate 4,76, sodium chloride 0.08-8.25, and sodium carbonate 0.40-1.57. EFFECT: increased adhesion and strength of cement stone. 3 tbl
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