| 钢纤维混凝土配合比 |
| 添加时间：2018/10/25 15:36:14 浏览次数： |
| 钢纤维混凝土混合料配合比的要求首先应使路面厚度减薄，其次是保证钢纤维混凝土有较高的抗弯强度，以满足结构设计对强度等级的要求即抗压强度与抗折强度，以及施工的和易性。钢纤维混凝土配合比设计基本按以下步骤进行。 In order to meet the requirement of strength grade in structural design, compressive strength and flexural strength, as well as the ease of construction, the thickness of pavement should be reduced firstly, and then the flexural strength of steel fiber reinforced concrete should be ensured. The mix proportion design of steel fiber reinforced concrete is basically carried out according to the following steps. （1）根据强度设计值以及施工配制强度提高系数，确定试配抗压强度与抗折强度；钢纤维混凝土抗折强度设计值的确定： (1) Determine the compressive strength and flexural strength of steel fiber reinforced concrete according to the design value of strength and the enhancement coefficient of construction strength. fftm＝ftm（1＋atmPfLf/df） FFTM = FTM (1 + FA) 式中 fftm——钢纤维混凝土抗折强度设计值； Medium FFTM - design value of flexural strength of steel fiber reinforced concrete. Ftm——与钢纤维混凝土具有相同的配合材料、水灰比和相近稠度的素混凝土的抗折强度设计值； Ftm - the design value of flexural strength of plain concrete with the same mixing material, water cement ratio and similar consistency as steel fiber reinforced concrete. atm———钢纤维对抗折强度的影响系数（试验确定）； ATM - the influence coefficient of steel fiber on flexural strength (determined by experiment); Pf———钢纤维体积率，％； Pf - steel fiber volume fraction,%; Lf/df———钢纤维长径比。 Lf/df - steel fiber aspect ratio. （2）根据试配抗压强度计算水灰比； (2) calculate the water cement ratio according to the test compressive strength; （3）根据试配抗压强度，确定钢纤维体积率，一般浇筑成型的结构范围在0.5％～2.0％之间； (3) According to the test compressive strength, the volume ratio of steel fiber is determined. The general casting structure range is between 0.5% and 2.0%. （4）按照施工要求的稠度确定单位体积用水量； (4) determine the volume of water per unit volume according to the consistency of construction requirements; （5）确定砂率； (5) determine sand rate; （6）计算混合材料用量，确定试配配合比； (6) calculate the amount of mixed material and determine the matching ratio. （7）按照试配配合比进行拌合物性能试验，调整单位体积用水量和砂率，确定强度试验用基准配合比； (7) Mixture performance tests were carried out according to the test mix ratio, water consumption per unit volume and sand rate were adjusted, and the benchmark mix ratio for strength test was determined. （8）根据强度试验结果调整水灰比和钢纤维体积率，确定施工配合比。 (8) adjust the water cement ratio and steel fiber volume ratio according to the strength test results, and determine the construction mix proportion. 试验结果表明，在经验和计算的基础上确定水泥用量、砂率及水灰比，并根据不同配比时的钢纤维混凝土强度进行试验，当水泥用量在380kg/m3～400kg/m3时强度较高，但此时砂率较小，砂石中有分离现象。因此将砂率调到0.48，如此强度虽有降低，但其余性能却可得到改善。为此，调整最佳配比即水泥∶黄砂∶碎石∶水＝1∶2.16∶2.34∶0.48。 The test results show that the cement dosage, sand ratio and water cement ratio are determined on the basis of experience and calculation, and the strength of steel fiber reinforced concrete is tested according to different mixing ratio. When the cement dosage is 380kg/m3 ~ 400kg/m3, the strength is higher, but the sand ratio is small, and there is separation phenomenon in sand and stone. Therefore, the sand rate will be adjusted to 0.48, so the strength can be reduced, but the other properties can be improved. For this reason, the best proportion is adjusted: cement: yellow sand: Gravel: water = 1: 2.16: 2.34: 0.48. |
| 上一页 聚酯纤维和冰丝有什么区别 |
| 下一页 玻璃钢纤维片 |
Copyright © 技术支持：遨游网络