41results about How to "Reduce the rate of hydration" patented technology

The invention discloses a concrete mud retarder. The concrete mud retarder comprises 50-80wt% of an aqueous polymer, 5-20wt% of gallic acid and 10-30wt% of diethylene glycol. A production technology of the aqueous polymer comprises the following steps: 1, taking 4-7 parts by weight of hydrogen peroxide and 8 parts by weight of water, and completely dissolving hydrogen peroxide in water to obtain a solution I; 2, taking 2-4 parts by weight of rongalite and 8 parts by weight of water, and completely dissolving rongalite in water to obtain a solution; 3, adding 35-40 parts by weight of water, respectively adding 7 parts by weight of acrylamide, 9 parts by weight of maleic anhydride and 21 parts by weight of allyl ether, and stirring; 4, adding 0.5-2 parts by weight of a chain transferring agent; and 5, heating to 40DEG C, simultaneously adding the solution I and the solution II in a dropwise manner, and controlling the reaction temperature to be 40-50DEG C and the dropwise addition time to be 2-4h, and cooling to 30DEG C after the above reaction in order to obtain the aqueous polymer with the solid content of 38-42%. The concrete mud retarder can reduce adsorption of a concrete water reducer on soil particles, improves the fluidity of a high-mud concrete system, and greatly improves the slump keeping property of the concrete water reducer.

The present invention relates to the technical field of building materials, and discloses a reinforced foamed concrete and its configuration method, including Portland cement, fly ash, aggregate, polyvinyl alcohol particles, foam stabilizer, mixed emulsion, Acrylamide-type reinforcing agent and hydrogen peroxide and other components. The present invention has the following advantages and effects: 1. Through the acrylamide-type reinforcing agent, the strength of the foamed concrete is improved, while overcoming the traditional two-way effect of only adding polyacrylamide, and improving the compressive strength of the foamed concrete. 2. The mixed emulsion is added to reduce the water-resistance of concrete, which makes the concrete water-retaining effect better, reduces the probability of various problems such as concrete cracking, and improves the concrete strength.

The invention discloses a super-elevation pumping marine concrete. The super-elevation pumping marine concrete is prepared from cement, fly ash, mineral powder, gravel, river sand, a hydration temperature rising regulation and control material, a corrosive ion transport inhibitor, a state modified material, an ultra dispersed water reducing shrinkage plasticity-maintaining additive and water in proportion. According to the super-elevation pumping marine concrete, by means of the hydration temperature rising regulation and control material, cracking caused by low high performance concrete, insufficient hydration and drying shrinkage in later period can be effectively avoided; by means of the hydration temperature rising inhibiting component, adiabatic temperature rising of the concrete can be lowered, and cracking generated by the temperature stress is reduced; by adopting the corrosive ion transport inhibitor, the pore structure of the concrete can be optimized, transport paths of ions such as Mg<2+> and Cl<->, and the concrete is better served in marine salt spray environment; the state modified material has the specific ball effect and water retention characteristic, and the phenomena of segregation and pipe blocking occurring in the super-elevation pumping process are avoided. The concrete is suitable for super-elevation pumping marine buildings and has the important engineering application value.

The invention relates to a low thermal expansion concrete and an admixture. The concrete includes cement clinker, fly ash, zeolite powder, granite crushed stone, and the balance is water. The cement clinker is composed of C3S: 5-20% , C2S: 20-45%, C3A: 5-10%, and C4AF: 5-10%, characterized in that the cement clinker also includes barium oxide 20-40%, strontium oxide 5-15%, cement clinker: ( Fly ash + zeolite powder): granite crushed stone = 1:1‑2:2‑4, water: cement clinker = 0.2‑0.4. For the first time, barium oxide and strontium oxide were used as expansion admixtures, and at the same time, with the newly developed retarder, and the combination of fly ash as an alternative material, especially zeolite powder, and the particle size ratio of granite crushed stone aggregate, the final The effect of concrete with low heat and micro-expansion is realized.

The invention relates to the technical field of cement grinding aids, in particular to a grinding aid for improving compatibility of cement and a water reducing agent. The grinding aid is prepared from, by weight, 20%-25% of diethanolisopropanolamine, 10%-15% of inorganic salt, 20%-30% of itaconic acid industrial effluent and the balance water. In use of the grinding aid, cement hydration can be decelerated, and cement paste is high in fluidity relatively and conducive to actions of the water reducing agent; since itaconic acid is binary unsaturated carboxylic acid, the itaconic acid is easier to compatible to a polycarboxylic water reducing agent according to the principle that the similar substances are more likely to be dissolved by each other, and a polymerization reaction between the itaconic acid and excessive macromonomers in the polycarboxylic water reducing agent can be realized under appropriate conditions to increase effective components of the polycarboxylic water reducing agent, so that effectiveness in use of the water reducing agent is improved. Therefore, compatibility of cement and the concrete water reducing agent is improved on the premise that grinding efficiency and cement strength are almost unchanged.