14 results about "Fineness modulus" patented technology

The invention provides a one-stop sandstone physical intelligent detection device, and relates to the technical field of sandstone detection, the one-stop sandstone physical intelligent detection device comprises a truss-type five-axis manipulator and a material distribution mechanism, a feeding platform is arranged below one end of the truss-type five-axis manipulator, and a heating dryer is arranged on one side of the feeding platform; and a vibration screening machine is arranged on one side of the heating dryer. Full-process automation and high integration of gravel component detection are achieved, a container is accurately grabbed and transferred through the truss type five-axis mechanical arm, a sample passes through a series of stations such as heating and drying, vibration screening, weighing and metering, stirring and washing, crushing testing and the like, and therefore gravel key indexes, gravel components and gravel components are detected in a one-stop mode. According to the technical scheme, comprehensive detection of the water content, the grain composition, the fineness modulus, the mud content, the mud block content, the crushing index, the methylene blue value and the stone powder is achieved, the detection range of equipment is greatly expanded, and the consistency of the detection efficiency and the result is remarkably improved through seamless connection assembly line work.

The invention provides localized special mortar as well as a preparation method and application thereof, and relates to the technical field of building materials. According to the method, the target fineness modulus is dynamically corrected by introducing the edge coefficient based on the crushing value of the machine-made sand, so that quantitative response to the edge difference of different batches of machine-made sand is realized; a cement-fly ash-activated recycled concrete micro powder ternary cementing material system is adopted, so that the early strength and the long-term performance are synergistically improved; and redispersible latex powder and hydroxypropyl methyl cellulose are compounded to form a water-retaining, tackifying and film-forming-enhanced composite admixture system, so that multiple targets of stable mortar workability, excellent mechanical properties and solid waste resource utilization are achieved, and the mortar has a wide engineering application prospect.

The invention discloses a concrete compressive strength prediction method based on a Stacking ensemble learning model, and the method comprises the steps: obtaining concrete characteristic parameters, including a water-binder ratio, a sand ratio, a mortar-to-bone ratio, the 28d compressive strength of a cementing material, a coarse aggregate grading parameter, a coarse aggregate void ratio, a fine aggregate grading parameter, a fineness modulus and a mortar surplus coefficient; the concrete characteristic parameters are input into a Stacking ensemble learning model, the Stacking ensemble learning model comprises a base model layer and a meta model layer, the base model layer integrates at least two different machine learning models and is used for generating primary prediction results, and the meta model layer is used for fusing all the primary prediction results; and outputting the 28d compressive strength prediction value of the concrete. The invention further discloses a prediction model based on the prediction method, a related computer program product and a storage medium, the concrete strength level can be rapidly predicted based on the method, and real-time and accurate data support is provided.

The invention aims to provide low-cost C80 concrete and a preparation method thereof, and belongs to the technical field of building construction. Comprising the following components in parts by weight: 730 parts of P.O42.5 ordinary Portland cement, 27 to 28 parts of F-class II-grade fly ash, 71 to 75 parts of S95 slag powder, 78.5 to 94.2 parts of copper-plated microfilament type steel fiber, 739 to 790 parts of broken stone with a particle size range of 5 to 15 mm, 520 to 525 parts of sand with a fineness modulus of 2.4 to 2.8, 2.7 to 4.8 parts of a polycarboxylic acid high-performance water reducing agent and 210 to 240 parts of water. The concrete disclosed by the invention is relatively low in cost and also has good comprehensive performance.

The application provides a kind of iron tailings sand-containing machine-made sand concrete and a preparation method thereof, relates to the technical field of building materials and solid waste resource utilization, and includes obtaining iron tailings sand and machine-made sand, respectively detecting the fineness modulus, 0.075mm below particle content, water absorption and moisture content of the iron tailings sand, and the fineness modulus, stone powder content, water absorption and moisture content of the machine-made sand.The iron tailings sand-containing machine-made sand concrete and the preparation method thereof detect the performance state of the iron tailings sand and the machine-made sand, and combine saturated surface dry conversion, mixing water correction, pre-wetting correction, compound control and segmented mixing, etc.Processing flow, effectively regulate the preparation process of composite fine aggregate, thereby improving the mix proportion adaptability and preparation stability of the iron tailings sand-containing machine-made sand concrete, and reducing the workability fluctuation and performance instability caused by the difference in particle composition and water absorption characteristics of the two types of fine aggregate.

The invention belongs to the technical field of constructional engineering, and particularly relates to a screening device for detecting the fineness modulus of sand and a screening detection method. According to the sand screening device, the sealing assemblies of the sealing parts are matched with the fixing assemblies, elastic sealing rings are arranged at the top and the bottom of each screening ring, tight sealing between the adjacent screening layers is achieved through vertical pressing of the upper pressing rings, the lower pressing rings and the connecting rods, and sand can be effectively prevented from being scattered from gaps in the screening process; the whole device is comprehensively protected through a protection barrel body and a sealing cover assembly of the protection part, external impurities can be prevented from entering the device, parts can be prevented from being collided and damaged, a stable frame structure is formed in combination with the fixing assembly, and the screen layer can be effectively prevented from loosening and shifting in the screening process; meanwhile, a spring assembly is adopted to buffer vibration impact force, and damage of vibration to the weighing sensor and other parts is reduced; and a preset sand fineness modulus algorithm is adopted, so that the sand sample fineness modulus can be accurately and efficiently obtained.

This invention belongs to the field of concrete technology and provides a method for inhibiting aggregate sulfate attack based on gradation control, cementitious material optimization, and ion curing synergy. The method involves using the initial aggregate with an SO3 content ≥0.5% as fine aggregate, rather than coarse aggregate, in concrete or mortar. The fine aggregate is composed of the initial aggregate and compliant aggregates, with a fineness modulus of 2.4~2.8. The invention employs different treatment methods for different SO3 contents in the initial aggregate: when the SO3 content is low, the aggregate is compounded according to a specific gradation curve; when the SO3 content is high, the aggregate is pretreated. The cement used in the cementitious material is low-C3A or low-C3S silicate cement, and the admixtures are single or double admixtures of F-type fly ash and silica fume to improve the matrix's corrosion resistance. A sulfate curing agent is added to fix sulfate ions and reduce attack.

The invention discloses sulfate-corrosion-resistant high-performance concrete for a photovoltaic pipe pile. The concrete comprises cement, coarse aggregate, fine aggregate, water, silicon powder, a water-reducing air-entraining agent and an anti-corrosion and anti-rust agent, gravel with the particle size not larger than 25 mm is selected as coarse aggregate, medium sand with the fineness modulus of 2.6-3.2 is selected as fine aggregate, 25-30% of silicon powder is doped, micro bubbles are introduced in combination with a water reducing and air entraining agent, the compactness, chloride ion permeability resistance and sulfate corrosion resistance of the concrete are improved, the concrete is suitable for a photovoltaic pipe pile foundation in a high-salt-alkali environment, and durability and stability are improved. The preparation method comprises the processes of raw material mixing, stirring and curing.

The present application belongs to the field of civil engineering material research and application technology, and particularly relates to a method for measuring and calculating sand fineness modulus and grading, which is based on the relationship between two-dimensional mortar section particle size and three-dimensional real particle size, establishes the relationship between the number of particles in each group of two-dimensional section and the number of particles in each group of sieving method, and combines with image analysis method to calculate sand fineness modulus and particle grading, which can not only avoid the defects such as large labor intensity and low efficiency of conventional sieving method, but also avoid the error caused by repeated weighing, effectively solve the problems of small particle radius invisible and large error caused by difficult dispersion of sand in image analysis process, and has important reference value for the research on sand in hardened concrete; the principle is scientific and reliable, the labor intensity is low, the efficiency is high, and good consistency is obtained compared with conventional sieving method.

The purpose of this invention is to address the problems existing in the calculation methods of the representative value of the 28-day compressive strength of concrete in the prior art, and to provide a method for calculating the representative value of the 28-day compressive strength of concrete and related parameters. This includes: 1. Calculation methods for the 28-day compressive strength of concrete, the calculated value of the 28-day compressive strength of cementitious materials, the water-cement ratio, the aggregate fineness modulus, and the dosage of water-reducing agent; 2. Calculation of fcu,o; 3. Calculation of W÷C; 4. Calculation of Q; 5. Calculation of f′ce. This invention's calculation method explains how to calculate the mix proportion parameters of concrete with mineral admixtures and high-flowability concrete. When other conditions are known, it is not necessary to look up tables to directly calculate the water-cement ratio, concrete strength, and verify the dosage of concrete water-reducing agent; the calculated value of the 28-day compressive strength of concrete can be directly verified from the concrete strength value.

The invention discloses a grain shape optimization grading control device for tuff machine-made sand, and relates to the technical field of building material processing. The device comprises a feeding unit, a grain shape optimization unit, a real-time monitoring unit, a grading control unit and an intelligent control system. The core of the invention lies in that the intelligent control system carries out calculation through a built-in comprehensive quality evaluation model containing sphericity, fineness modulus and stone powder content based on real-time grain shape, grading data and stone powder content fed back by a real-time monitoring unit; and the rotating speed of the grain shape optimization unit and the vibration frequency and the airflow speed of the grading control unit are dynamically adjusted by using a feedback control algorithm, so that integrated and intelligent closed-loop control of grain shape optimization and grading control is realized. The method is particularly suitable for solving the technical problem that in tuff machine-made sand production, the content of needle-sheet-shaped particles and stone powder is difficult to stably control, and the stability of product quality and production benefits can be effectively improved.

The invention discloses a pavement positive concrete mix proportion design method, and relates to the technical field of mix proportion design of hard concrete for roads and airport runways. The method comprises the following steps: setting the volume fraction Vg of coarse aggregate in concrete according to the grain shape of the coarse aggregate; determining the volume sand ratio beta v according to the maximum particle size of the coarse aggregate and the fineness modulus of the fine aggregate, and calculating the volume fraction Vs of the fine aggregate; calculating a water-cement ratio based on the target strength and adapting an additive; calculating the volume fraction Vp = 1-Vg-Vs of the slurry, and determining the mass of the slurry and the use amount of the cementing material in combination with the water-cement ratio and the density of the cementing material; correcting the dosage of each component according to the designed gas content Va; and determining the gradation of the coarse aggregate and the mixing amount of the additive through an adaptation test. By means of the method, the problems of'insufficient and bulking 'and'slurry redundancy' can be fundamentally solved, the volume stability of the concrete is accurately controlled while the using amount of the cementing material is remarkably reduced, and the mechanical performance and the durability of the concrete are improved.

The application discloses a machine-made sand foam concrete, and each component and weight percentage thereof include: 150-400 parts of Portland cement, 50-150 parts of fly ash, 30-70 parts of silica ash, 120-650 parts of machine-made sand, 60-110 parts of expanded perlite, 10-30 parts of graphene oxide dispersion liquid, 5-10 parts of steel fiber, 5-10 parts of water reducing agent, 2.5-10 parts of modified protein foaming agent, and 220-250 parts of water. The machine-made sand foam concrete can guarantee good mechanical properties, and can also consider good anti-shrinkage performance and waterproof performance, and can effectively reduce the volume weight, and can realize effective application of machine-made sand with large fineness modulus in the foam concrete. The preparation method is simple and convenient to operate, and is suitable for popularization and application.

This invention specifically relates to a wind-powered classification and sand-making device and method. The device includes a raw material silo, a material air classification system, an oversized material crushing system, a dust removal device, and a stone powder silo. The material air classification system includes a primary air classification system and a secondary air classification system. The raw material silo feeds material to the material air classification system. The primary air classification system separates micro-powder, first fine particles, and first coarse particles. The secondary air classification system separates micro-powder, second fine particles, and second coarse particles. The first and second fine particles are mixed to form manufactured sand. The first and second coarse particles are fed to the oversized material crushing system for crushing to form crushed material. The crushed material is then fed back to the material air classification system for further air classification. The material air classification system achieves two-stage air classification, forming a loop with the oversized material crushing system, enabling material circulation, facilitating adjustment of the fineness modulus, ensuring continuous product gradation, and effectively guaranteeing product quality.