37results about How to "With water reduction" patented technology

The invention discloses a construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas. The construction technique comprises the steps as follows: A, mixing ultralow-temperature high-property concrete: gelled materials, sand, crushed stone, an efficient water reducing agent, compound antifreeze and water are evenly mixed to obtain the ultralow-temperature high-property concrete; the gelled materials are made by evenly mixing cement and mineral admixtures in the weight ratio of (88-78):(12-22); the weight ratio of the compound antifreeze to the mineral admixtures is (3-6):100; the compound antifreeze comprises 30 to 35 wt% of nitrate, 30 to 33 wt% of organic compound, 0.5 to 1wt% of calcium formate, and water as the rest; the nitrate is calcium nitrate or calcium nitrite; and the organic compound is methanol or alcohol; B, pouring the ultralow-temperature high-property concrete; and C, curing the ultralow-temperature high-property concrete. The construction technique has the advantages of reasonable design, simplicity in construction steps, convenience in operation, fast construction progress, low construction cost, and good structural quality of concrete used in construction.

The invention provides a concrete complex additive which comprises the following components by weight percent: 17.5-58.0% of efficient water reducing agent, 0.5-5.5% of organosilicon waterproofing agent, 0.2-2.5% of organosilicon reinforcing agent, 3.5-25% of polyacrylamide, 1.2-2.8% of triethanolamine, 3.2-6.3% of sodium nitrite, 0.3-1.2% of glycol, 0.6-1.3% of glycerol, 2.8-5.5% of sodium gluconate and the balance of water. The impact resistance, crocking resistance, impermeability and waterproofness of the concrete material can be obviously improved by using the complex additive provided by the application in the preparation process of the concrete, thus the concrete complex additives is especially suitable for the requirement on high-performance concrete for construction of airfield runways or highway bridges.

The invention discloses a volume stabilizer for a cement-based composite material and a preparation method thereof. The volume stabilizer comprises the following components in part by weight: 180 and 220 parts of periclase, 18 to 21 parts of polycarboxylate, 27 to 32 parts of polyacrylate and 0.8 to 1.1 parts of sodium polyphosphate, wherein the periclase is ground into fine powder; the fine powder is sieved by a 85mu m sieve; and residue on the sieve is less than 10 percent. The method comprises the following steps: a, grinding magnesite serving as raw materials into fine power and sieving the fine powder with the 85mu m sieve, wherein residue on the sieve is less than or equal to 10 percent; b, calcining the ground magnesite powder at the temperature of between 900 and 1,250 DEG C, preserving the heat for 30 to 120 minutes, and cooling the calcined magnesite powder to room temperature after the heat preservation is finished to prepare the periclase; c, grinding the periclase into fine powder and sieving the fine powder with a 85mu m sieve, wherein residues on the sieve is less than or equal to 10 percent; and d, mixing the periclase obtained in the step c, the polycarboxylate, the polyacrylate and the sodium polyphosphate in proportion. The volume stabilizer and the preparation method can solve the problem of cracking of cement-based materials caused by contraction.

The invention discloses a sealing material for a container with high integrity and a preparation method as well as an application thereof. The sealing material comprises 78.4 to 117.6 parts of cement, 2.96 to 18.4 parts of polymer emulsion, 80 to 120 parts of sand, 6.85 to 21.35 parts of water, 0.24 to 1.2 parts of water reducing agent, 1.6 to 19.2 parts of swelling agent and 0.44 to 2.76 parts of curing agent. The sealing material is high in denseness strength, high in fluidity, free of shrinkage, high in irradiation resistance and high in durability. The sealing material is grouted into a sealing cavity between a barrel cover and a barrel body of the container with the high integrity by using an air pressure grouting method. After the sealing material is hardened, the barrel cover and the barrel body of the container with the high integrity can be combined to form the whole structure, so that nuclear waste materials in the container cannot leak within 300 years. The sealing material can be applied to the fields of nuclear waste treatment and building structure restoration.

The invention discloses anti-cracking mortar, and relates to the technical field of building materials. The anti-cracking mortar is prepared from the following components of cement, fly ash, vermiculite powder, yellow sand, opal, perlite, cellulose ether, furfuryl alcohol activated clay, wood fiber and water. The anti-cracking mortar has the advantages that by determining the contents of the components, each component is ensured to reach the optimum synergistic effect; especially under the synergistic action of the furfuryl alcohol activated clay, the multiple properties of water seepage prevention, shock resistance, abrasion resistance, water reduction, freezing resistance, cracking resistance and the like are simultaneously realized.