A method for manufacturing supplementary cementitious material includes the steps of: providing a starting material containing clay and fly ash or a mixture of fly ash and bottom ash, wherein at least 70 wt.-% of the starting material are clay, fly ash and bottom ash, homogenization of the starting material, thermal treatment of the starting material at a temperature from 700 to 1000 C. to provide a heat treated material, cooling the heat treated material to provide a cooled product, and grinding the cooled product to provide the supplementary cementitious material, and use of the supplementary cementitious material obtainable through the method for manufacturing hydraulic building materials, as well as supplementary cementitious material obtained.

There is provided a Ultra-high performance glass concrete (UHPGC) including between 300 and 1000 kg/m.sup.3 of cement, between 0 and 1400 kg/m.sup.3 of glass sand (GS), between 0 and 300 kg/m.sup.3 of reactive pozzolanic material, between 150 and 900 kg/m.sup.3 of glass powder (GP), between 0 and 600 kg/m.sup.3 of fine glass powder (FGP), between 5 and 60 kg/m.sup.3 of superplasticizer, between 50 and 300 kg/m.sup.3 of fiber; and, between 130 and 275 kg/m.sup.3 of water, wherein the content of GP is of at least 3 wt % of the UHPGC, and/or the content of GS is of at least 19 wt % of the UHPGC and/or the content of FGP is of at least 0.5 wt % of the UHPGC.

There is provided a Ultra-high performance glass concrete (UHPGC) including between 300 and 1000 kg/m.sup.3 of cement, between 0 and 1400 kg/m.sup.3 of glass sand (GS), between 0 and 300 kg/m.sup.3 of reactive pozzolanic material, between 150 and 900 kg/m.sup.3 of glass powder (GP), between 0 and 600 kg/m.sup.3 of fine glass powder (FGP), between 5 and 60 kg/m.sup.3 of superplasticizer, between 50 and 300 kg/m.sup.3 of fiber; and, between 130 and 275 kg/m.sup.3 of water, wherein the content of GP is of at least 3 wt % of the UHPGC, and/or the content of GS is of at least 19 wt % of the UHPGC and/or the content of FGP is of at least 0.5 wt % of the UHPGC.

Methods and compositions are provided that related to cementing operations. Methods and compositions that include pumice and/or perlite as a replacement for fly ash.

Methods and compositions are provided that related to cementing operations. Methods and compositions that include pumice and/or perlite as a replacement for fly ash.

Well-cementing compositions for use in high-pressure, high-temperature (HPHT) wells are often densified, and contain weighting agents such as hematite, ilmenite, barite and hausmannite. The weighting agents are usually finely divided to help keep them suspended in the cement slurry. At high temperatures, finely divided weighting agents based on metal oxides react with the calcium-silicate-hydrate binder in set Portland, cement, leading to cement deterioration. Finely divided weighting agents based on metal sulfates are inert with respect to calcium silicate hydrate; consequently, set-cement stability is preserved.

Well-cementing compositions for use in high-pressure, high-temperature (HPHT) wells are often densified, and contain weighting agents such as hematite, ilmenite, barite and hausmannite. The weighting agents are usually finely divided to help keep them suspended in the cement slurry. At high temperatures, finely divided weighting agents based on metal oxides react with the calcium-silicate-hydrate binder in set Portland, cement, leading to cement deterioration. Finely divided weighting agents based on metal sulfates are inert with respect to calcium silicate hydrate; consequently, set-cement stability is preserved.

A downhole treatment composition comprises a rare earth-containing compound comprising one or more of the following: scandium; yttrium; lanthanum; cerium; praseodymium; neodymium; promethium; samarium; lutetium; europium; gadolinium; terbium; dysprosium; holmium; erbium; thulium; or ytterbium, wherein the downhole treatment composition is a cement slurry, a drilling fluid, or a spacer fluid. Also disclosed are methods of cementing a wellbore, methods of displacing a first fluid, and methods of drilling a wellbore in a subterranean formation using the cement slurry, the spacer fluid, or the drilling fluid.

A downhole treatment composition comprises a rare earth-containing compound comprising one or more of the following: scandium; yttrium; lanthanum; cerium; praseodymium; neodymium; promethium; samarium; lutetium; europium; gadolinium; terbium; dysprosium; holmium; erbium; thulium; or ytterbium, wherein the downhole treatment composition is a cement slurry, a drilling fluid, or a spacer fluid. Also disclosed are methods of cementing a wellbore, methods of displacing a first fluid, and methods of drilling a wellbore in a subterranean formation using the cement slurry, the spacer fluid, or the drilling fluid.

Cement compositions and methods of making the same are provided. The composition comprises cement or lime, water and Lassenite, a pozzolanic strength retrogression inhibitor.