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螺旋洗砂机对砂细度模数对混凝土性能的影响有哪些?/What is the effect of the spiral sand washing machine on the sand fineness modulus on the concrete performance?

来源: 时间:2018-01-10 08:46:02 浏览次数:

螺旋洗砂机对砂细度模数不同和易性有一定影响,螺旋洗砂机对砂细度模数不同对混凝土和易性的影响。混凝土施工的配合比.拉制混凝土生产质量,以及合理使用细度模数不稳定的砂。The spiral sand washing machine has a certain influence on the workability of sand with different fineness modulus.

螺旋洗砂机对砂细度模数不同和易性有一定影响,螺旋洗砂机对砂细度模数不同对混凝土和易性的影响。混凝土施工的配合比.拉制混凝土生产质量,以及合理使用细度模数不稳定的砂。

   在水泥用量、砂率和水胶比一定的条件下,混凝土坍落度随砂细度模数的减小成比例降低,两者近似线性关系。螺旋洗砂机对砂细度模数每减小0.1,坍落度降低约10mm。这主要是因为螺旋洗砂机对砂变细时其表面积增大,当混凝土中水泥浆用量一定的情况下,集料颗粒表面积相对减薄,混凝土就变得干稠,流动性就变小,导致坍落度降低。相反.当螺旋洗砂机对砂变粗时其表面积减小,当混凝土中水泥浆用量一定的情况下.包裹螺旋洗砂机对砂表面后就会有多余的水泥浆流出,混凝土就会变稀,流动性变大,从而使坍落度增大。

   在螺旋洗砂机对砂率、水胶比、水泥用量固定时,螺旋洗砂机对砂拌制的混凝土,粘聚性和保水性差,易产生泌水、离析等现象,严重影响混凝土的质量。细螺旋洗砂机对砂混凝土虽然保水性好,几乎不泌水,也不易离析,但其坍落度小,不利于泵送混凝土的施工甚至无法施工。至此,要获得相同质量和相同坍落度的混凝土,可在以上试验基础上,通过调整螺旋洗砂机对砂率来改变混凝土的质量,使其在不同细度模数下达到状态。

   不同细度模数螺旋洗砂机对砂拌制的混凝土坍落度及外观,在细度模数相同的情况下,对螺旋洗砂机对砂率进行调整,得到不同螺旋洗砂机对砂率的混凝土坍落度及外观质量。

   螺旋洗砂机对砂就要增多,否则螺旋洗砂机对砂浆将不能填满被挤开的粗集料空隙,混凝土不能捣密实;细螺旋洗砂机对砂则相反,对粗集料的“干涉”作用小,用较少的螺旋洗砂机对砂,螺旋洗砂机对砂浆即能填满粗集料的空隙。故螺旋洗砂机对砂细度模数不同对混凝土配合比有较大的影响。

   在施工过程中.当螺旋洗砂机对砂比预定细时,拌出的混凝土坍落度偏小,为保证施工操作需保持预定的坍落度,往往简单地采取多加水的办法来解决,结果增大了水胶比导致强度降低,这易使人们产生细螺旋洗砂机对砂混凝土强度低于粗螺旋洗砂机对砂混凝土强度的误解。上述试验表明,只要保持水胶比不变,且有一定的流动度(即有足够的水泥浆填充螺旋洗砂机对砂空隙和包裹螺旋洗砂机对砂表面〕,螺旋洗砂机对砂细度模数就不会影响混凝土强度。

   (1)螺旋洗砂机对砂细度模数对棍凝土的流动性有明显影响,细度模数每减小0.1,坍落度降低约IOmmo

  (2)螺旋洗砂机对砂细度模数变化对混凝土配合比有显著影响,且有规律:细度模数在一定范围(2.2一3.1)内时,可不改变用水量和水泥用量,细度模数每增减0甲1,螺旋洗砂机对砂用量约增减2%.相应地减增石子用量;当螺旋洗砂机对砂细度模数》3甲0或<2. 0时,就要增加用水量和水泥用量,细度模数每减小0.1,用水量和水泥用量约增加1.2%。

   {3))螺旋洗砂机对砂细度模数不同对混凝土的抗压强度影响甚微或不影响,且坍落度变化对混凝土抗压强度也无影响。

The spiral sand washing machine has a certain influence on the workability of sand with different fineness modulus. The spiral sand washing machine has a certain influence on the workability of concrete with different fineness modulus of sand. Mix proportion of concrete construction, production quality of drawn concrete and reasonable use of sand with unstable fineness modulus.
When the cement dosage, sand ratio and water binder ratio are fixed, the slump of concrete decreases proportionally with the decrease of sand fineness modulus, and the relationship between them is approximately linear. For every 0.1 reduction of sand fineness modulus, the slump of the spiral sand washing machine decreases about 10 mm. This is mainly due to the increase of the surface area of the sand when the spiral sand washing machine thins the sand. When the amount of cement slurry in the concrete is fixed, the surface area of aggregate particles is relatively thin, the concrete becomes dry and thick, and the fluidity becomes small, resulting in the decrease of slump. On the contrary, when the spiral sand washer coarsens the sand, its surface area will decrease. When the amount of cement slurry in the concrete is fixed, there will be excess cement slurry flowing out after wrapping the spiral sand washer on the sand surface, and the concrete will become thinner and the fluidity will increase, thus increasing the slump.
When the sand ratio, water cement ratio and cement dosage are fixed by the spiral sand washing machine, the cohesiveness and water retention of the concrete mixed by the spiral sand washing machine are poor, and it is easy to produce bleeding, segregation and other phenomena, which seriously affects the quality of concrete. Although the fine spiral sand washing machine has good water retention, almost no bleeding, and is not easy to separate, its slump is small, which is not conducive to the construction of pumping concrete or even unable to construct. So far, in order to obtain the same quality and the same slump of concrete, on the basis of the above tests, the quality of concrete can be changed by adjusting the sand ratio of the spiral sand washer, so that it can reach the best state under different fineness modulus.
When the fineness modulus is the same, the concrete slump and appearance quality of different spiral sand washing machine are obtained by adjusting the sand rate of the spiral sand washing machine.
The spiral sand washing machine will increase the amount of sand, otherwise, the spiral sand washing machine will not be able to fill the space of the squeezed coarse aggregate for the mortar, and the concrete will not be compacted; the fine spiral sand washing machine will be opposite to the sand, and the "interference" effect on the coarse aggregate will be small, and the less spiral sand washing machine will be used for the sand, and the spiral sand washing machine will be able to fill the space of the coarse aggregate for the mortar. Therefore, the different fineness modulus of the spiral sand washing machine has a great influence on the concrete mix proportion.
In the process of construction, when the sand ratio of the spiral sand washer is smaller than that of the coarse sand washer, the slump of the concrete mixed out is smaller. In order to ensure that the construction operation needs to maintain the predetermined slump, it is often simply to add more water to solve the problem. As a result, the water cement ratio is increased and the strength is reduced, which is easy to cause that the strength of the fine spiral sand washer to the sand concrete is lower than that of the coarse spiral sand washer to the sand concrete Misunderstanding. The above tests show that as long as the water binder ratio is kept constant and there is a certain degree of fluidity (that is, there is enough cement slurry to fill the sand gap of the spiral sand washer and wrap the spiral sand washer on the sand surface), the modulus of sand fineness of the spiral sand washer will not affect the concrete strength.
(1) the spiral sand washing machine has an obvious effect on the fluidity of the rod concrete with the fineness modulus reduced by 0.1, and the slump decreased by about iommo
(2) the change of sand fineness modulus of spiral sand washing machine has a significant effect on the concrete mix proportion, and there is a rule: when the fineness modulus is within a certain range (2.2-3.1), the water consumption and cement consumption can not be changed. When the fineness modulus is increased or decreased by 0 a 1, the sand consumption of spiral sand washing machine is increased or decreased by 2%. The stone consumption is correspondingly reduced; when the sand fineness modulus of spiral sand washing machine is 3 a 0 or < 2.0, it is increased When the fineness modulus decreases by 0.1, the water consumption and cement consumption increase by 1.2%.
{3) the different fineness modulus of sand has little or no effect on the compressive strength of concrete, and the change of slump has no effect on the compressive strength of concrete.

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