阅读说明：本技术 一种砂石骨料级配优化方法 (Sandstone aggregate grading optimization method ) 是由 艾洪祥 卢霄 张平 王军 古龙龙 苏温馨 于 2020-07-30 设计创作，主要内容包括：本发明公开了一种砂石骨料级配优化方法,首先对砂石骨料进行筛分,得到各级骨料对应的筛孔边长为d<Sub>i</Sub>和分计筛余百分率pi,利用所得筛分信息计算砂石骨料的级配连续系数SG<Sub>m</Sub>,并与级配连续系数的目标值SG<Sub>标</Sub>进行对比,对砂石骨料的级配条件进行评价以指导后续级配调整工序。本发明通过设计出一种科学合理的骨料级配连续系数评价方法,可同步对骨料整体粗细程度和骨料级配连续分布状态进行评价和调整,以迅速优化骨料级配,并有效提升骨料级配品质；且涉及的优化过程简单、操作方便、适用性广,可有效指导砂石骨料生产,适合推广应用。(The invention discloses a sandstone aggregate gradation optimization method, which comprises the steps of screening sandstone aggregates to obtain the side length d of a sieve pore corresponding to each grade of aggregates i And calculating the surplus screening percentage pi, and calculating the gradation continuity coefficient SG of the sandstone aggregate by using the obtained screening information m And is matched with the target value SG of the grading continuous coefficient Sign board And (4) comparing, and evaluating the gradation condition of the sandstone aggregate so as to guide the subsequent gradation adjustment process. According to the invention, a scientific and reasonable aggregate gradation continuous coefficient evaluation method is designed, so that the overall thickness degree of the aggregate and the continuous distribution state of the aggregate gradation can be synchronously evaluated and adjusted, the aggregate gradation can be rapidly optimized, and the quality of the aggregate gradation can be effectively improved; and the related optimization process is simple, the operation is convenient, the applicability is wide, the production of the sandstone aggregate can be effectively guided, and the method is suitable for popularization and application.)

1. A sand aggregate grading optimization method is characterized by comprising the following steps:

1) screening the sandstone aggregate to obtain graded aggregate with different particle size intervals; the graded aggregate is divided into n grades of aggregates according to the increasing order of the particle size of the aggregates, wherein the side length of a sieve pore of the ith grade of aggregate is d_iThe calculated percent screen residue of the ith fraction aggregate is p_iI ═ 1, 2,. or n, n being a natural number greater than 3;

2) calculating the grading continuity coefficient SG of the sandstone aggregate according to the screening result in the step 1)_mWherein SG_m＝∑d_ip_iM is the gradation adjustment times of the sandstone aggregate; obtaining the initial grading continuous coefficient SG₀；

3) The initial grading continuity coefficient SG of the obtained sandstone aggregate₀Target value SG of gradation continuity coefficient_{Sign board}Comparing, and obtaining the aggregate grading continuous coefficient SG₀At SG_{Sign board}When the aggregate is within the value range, grading optimization on the corresponding batch of sandstone aggregate is not needed; when aggregate gradation continuity factor SG₀Over SG_{Sign board}When the value range of (2) is obtained, firstly, the maximum gradation continuous coefficient MAX (d) in the graded aggregate is obtained by calculation_ip_i) Adjusting maximum gradation connectionContinuous coefficient MAX (d)_imaxp_imax) Corresponding ith_maxStage and ith_max+1 stage or i_max-fractional oversize percentage of 1 grade graded aggregate; the gradation of the sandstone aggregate is adjusted for m times according to the steps until the gradation continuous coefficient SG is obtained_mConform to SG_{Sign board}The value range of (a).

2. The sand-aggregate gradation optimization method according to claim 1, wherein the sand aggregate is a coarse aggregate or a fine aggregate.

3. The sand-stone aggregate gradation optimization method according to claim 2, wherein the particle size range of the fine aggregate is 0-5 mm; the particle size range of the coarse aggregate is 5-16 mm, 5-20 mm, 5-25 mm, 5-31.5 mm or 5-40 mm.

4. The sand-stone aggregate gradation optimization method according to claim 2, wherein SG is such that the particle size of the fine aggregate is 0-5 mm_{Sign board}The value range of (A) is 0.7-1.4; SG when the particle size range of the coarse aggregate is 5-16 mm_{Sign board}The value range of (1) is 7.0-8.0; when the particle size range of the coarse aggregate is 5-20 mm, SG_{Sign board}The value range of (A) is 9.0-10.5; SG when the particle size range of the coarse aggregate is 5-25 mm_{Sign board}The value range of (A) is 11.0-13.0; SG when the particle size range of the coarse aggregate is 5-31.5 mm_{Sign board}The value range of (1) is 12.0-14.0; SG when the particle size range of the stone aggregate is 5-40 mm_{Sign board}The value range of (A) is 15.0-17.5.

5. The sand-aggregate grading optimization method according to claim 2, characterized in that the grading continuity coefficient SG obtained in step 3) when calculating_mGreater than SG_{Sign board}When the upper limit value of (i) is exceeded, the (i) th_maxFractional percent rejects p of a fraction_imaxDecrease a%, (i) th_max-fractional percent rejects p of grade 1_imax-1A% is improved; when the calculated gradation continuity coefficient SG_mLess than SG_{Sign board}Lower limit value ofI will be_maxFractional percent rejects p of a fraction_imaxDecrease a%, (i) th_max+1 fractional percent rejects p_imax+1The improvement is a percent.

6. The sand-gravel aggregate gradation optimization method according to claim 2, wherein the value of a ranges from 3 to 5.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a sand aggregate grading optimization method.

Background

Modern concrete takes a large flow state as a main body, the requirement on the workability of the concrete is higher and higher, and the requirement on the quality of gravel aggregate is higher and higher objectively. At present, the quality of the sandstone in China is poor on the whole, and the problems of large consumption of concrete cementing materials, large water consumption and the like are mainly reflected in poor grain shape, poor gradation and the like. And because the quality of the sand used for production fluctuates greatly, the problems of pipe blockage, segregation, bleeding and the like frequently occur in the construction process of the concrete. The quality of the aggregate becomes the bottleneck of the development of the modern concrete technology, and the engineering quality is seriously influenced. Improving the quality of the sand and stone is a necessary way for improving the concrete industry and technology. The definition of the high-performance concrete clearly requires the adoption of high-quality conventional raw materials, and the technical system and the requirement for providing and establishing the high-quality aggregate are imperative.

At present, the general aggregate grading optimization design of the sandstone is developed mainly according to the theory of maximum compactness and minimum porosity, and the concrete mixture with good working performance is formed by the minimum mortar volume (completely wrapping aggregate) and the maximum aggregate volume; however, the related design method is single, the simple pursuit of the porosity is minimum, the compactness is maximum, the preparation process is complicated, the evaluation method is single, and certain irrationality exists. The prior related methods for evaluating the grading quality of the aggregate comprise three methods, namely porosity, fineness modulus of the aggregate, limitation on accumulated surplus range of different grading intervals in standards and the like, and respectively correspond to the following technical problems that 1) the porosity evaluation can only give a final porosity result of the aggregate to indicate the stacking compactness of the aggregate, and a specific optimization method for the grading quality with high porosity cannot be given; 2) aggregate fineness modulus evaluation, which is only aiming at fine aggregates (sand) at present, the method can only be adopted to calculate the integral average fineness degree of the sand aggregates by using accumulated siftings with different nominal particle sizes as a single variable to be sleeved into a formula, and the grading continuous distribution quality of the sand aggregates cannot be judged; 3) the limitation of the accumulated surplus range of different grading intervals in the standard only provides a wider limited range of the accumulated surplus of the aggregates with different nominal particle sizes, and does not describe a specific aggregate grading evaluation method and how to optimize grading if the aggregate grading is out of the range.

Disclosure of Invention

The invention mainly aims to provide a sandstone aggregate gradation optimization method aiming at the defects of the existing sandstone aggregate optimization technology and aggregate adjustment means, and by designing a scientific and reasonable aggregate gradation continuous coefficient evaluation method, the overall thickness degree of aggregate and the quality of aggregate gradation continuous distribution can be synchronously evaluated and adjusted so as to quickly optimize aggregate gradation and effectively improve the quality of aggregate gradation; the method has the advantages of simple related optimization process, convenient operation and wide applicability, can effectively guide the production of the sandstone aggregate, and is suitable for popularization and application.

In order to achieve the purpose, the invention adopts the technical scheme that:

a sand aggregate grading optimization method comprises the following steps:

1) screening the sandstone aggregate by adopting a standard sieve to obtain graded aggregate with different particle size intervals; the graded aggregate is divided into n grades of aggregates according to the increasing order of the particle size of the aggregates, wherein the side length of a sieve pore of the ith grade of aggregate is d_i(in mm) and the fraction of i-th fraction aggregate has a calculated percent oversize of p_iI ═ 1, 2,. or n, n being a natural number greater than 3;

2) calculating the grading continuity coefficient SG of the sandstone aggregate according to the screening result in the step 1)_mWherein SG_m＝∑d_ip_iM is the gradation adjustment frequency of the sandstone aggregate (generally, m is less than 6); obtaining the initial grading continuous coefficient SG₀；

3) The initial grading continuity coefficient SG of the obtained sandstone aggregate₀Target value SG of gradation continuity coefficient_{Sign board}Comparing, and obtaining the aggregate grading continuous coefficient SG₀At SG_{Sign board}When the aggregate is within the value range, grading optimization on the corresponding batch of sandstone aggregate is not needed; when aggregate gradation is continuousCoefficient SG₀Over SG_{Sign board}When the value range of (2) is obtained, firstly, the maximum gradation continuous coefficient MAX (d) in the graded aggregate is obtained by calculation_ip_i) Adjusting the maximum gradation continuity factor MAX (d)_imaxp_imax) Corresponding ith_maxStage and ith_max+1 stage or i_max-fractional oversize percentage of 1 grade graded aggregate; the gradation of the sandstone aggregate is adjusted for m times according to the steps until the gradation continuous coefficient SG is obtained_mConform to SG_{Sign board}The value range of (a).

In the scheme, the sandstone aggregate is coarse aggregate or fine aggregate.

In the scheme, the particle size range of the fine aggregate is 0-5 mm; the particle size range of the coarse aggregate is 5-16 mm, 5-20 mm, 5-25 mm, 5-31.5 mm or 5-40 mm.

In the scheme, when the particle size range of the fine aggregate is 0-5 mm, SG_{Sign board}The value range of (A) is 0.7-1.4; SG when the particle size range of the stone aggregate is 5-16 mm_{Sign board}The value range of (1) is 7.0-8.0; SG when the particle size range of the coarse aggregate is 5-20 mm_{Sign board}The value range of (A) is 9.0-10.5; SG when the particle size range of the coarse aggregate is 5-25 mm_{Sign board}The value range of (A) is 11.0-13.0; SG when the particle size range of the coarse aggregate is 5-31.5 mm_{Sign board}The value range of (1) is 12.0-14.0; SG when the particle size range of the coarse aggregate is 5-40 mm_{Sign board}The value range of (A) is 15.0-17.5.

In the scheme, the gradation continuous coefficient SG obtained by calculation in the step 3)_mGreater than SG_{Sign board}When the upper limit value of (i) is exceeded, the (i) th_maxFractional percent rejects p of a fraction_imaxDecrease a%, (i) th_max-fractional percent rejects p of grade 1_imax-1A% is improved; when the calculated gradation continuity coefficient SG_mLess than SG_{Sign board}At the lower limit value of (1), the ith_maxFractional percent rejects p of a fraction_imaxDecrease a%, (i) th_max+1 fractional percent rejects p_imax+1The improvement is a percent.

Preferably, the value range of the a is 3-5.

The sand-stone aggregate grading optimization technology has wide applicability, is suitable for the optimization work of various production sand-stone aggregates, and can effectively improve the quality of sand in the current market.

Compared with the prior art, the invention has the beneficial effects that:

1) the aggregate grading optimization process is simple and convenient to operate, an efficient and feasible scheme can be provided for a sandstone aggregate evaluation system and a sandstone adjustment means, and the blank of the related field of the existing aggregate grading optimization method is effectively filled; the optimization method provided by the invention has strong applicability to evaluating the grade degree of sand and stone grading, and is suitable for popularization and application.

2) The invention firstly proposes to use the gradation continuous coefficient SG_xAs an evaluation index, MAX (d) is used_ip_i) The corresponding graded aggregate is a reference node in the concrete aggregate adjusting step, and on the premise of greatly simplifying the aggregate adjusting step, the adjustment of the overall thickness degree and the continuous distribution state of the aggregate can be synchronously realized, so that the production of the existing aggregate can be effectively guided.

3) The sandstone aggregate optimized by the method has high compactness and low porosity, and can obviously improve the workability of the mixture and reduce the consumption of the rubber material when being applied to concrete.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.