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Pervious concrete proportion design method based on cement mortar density and wrapping performance

A technology for permeable concrete and cement mortar, applied in the directions of calculation, data processing application, instrument, etc., can solve the problems of tedious calculation process, cumbersome process, test, etc., and achieve the effect of simplifying the calculation process, strong practicability, and easy operation.

Active Publication Date: 2021-04-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In existing technical regulations and standards, the amount of cementitious material is determined based on factors such as design porosity, synthetic density of cementitious material, water-binder ratio, etc., which requires not only knowing the density of each material, but also a tedious calculation process
Some studies adopt the design method of coating thickness of the aggregate surface, the disadvantage is that the aggregate is assumed to be a spherical structure, ignoring the difference in the volume structure of the aggregate and the rich texture structure of the surface
At the same time, since freshly mixed pervious concrete is dry and hard concrete, its working performance cannot be tested by conventional methods. In the existing technical regulations and standards, it is necessary to carry out multiple trial mixes of pervious concrete before it can be finally determined. The process is cumbersome, and only through The observation method is used to determine the working status, and the evaluation indicators are not clear
[0004] It can be seen that the mix ratio design method of permeable concrete is still not perfect, or has a certain degree of subjectivity, or the process is relatively cumbersome

Method used

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  • Pervious concrete proportion design method based on cement mortar density and wrapping performance
  • Pervious concrete proportion design method based on cement mortar density and wrapping performance
  • Pervious concrete proportion design method based on cement mortar density and wrapping performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The design method of permeable concrete mix ratio based on cement mortar density and coating performance, the specific process is as follows:

[0051] 1) Use 4.75 ~ 9.5mm single particle size aggregate, close packing density ρ g0 =1.700g / cm 3 , Aggregate dosage correction factor α = 0.98, per cubic meter of permeable concrete aggregate dosage is:

[0052] m g =α·ρ g0 =0.98×1.700g / cm 3 ×1m 3 =1666.0kg

[0053] aggregate apparent density ρ g =2.930g / cm 3 , design porosity V air =15%, glue volume V B for:

[0054]

[0055] 2) Prepare plain cement slurry with a water-cement ratio of 0.32, and the amount of cement is m C =800g, water consumption is m W = 256 g. Determine the density of the glue as ρ B =2.0346g / cm 3 . Calculation of the design glue dosage M B and design pulp set ratio R B / A :

[0056] m B =V B ·ρ B =0.2814m 3 ×2.0346g / cm 3 =572.5kg

[0057]

[0058] 3) Weigh the mass as m 1 Aggregate two parts, m 1 (unvibrated) = 30.4g, m 1 (...

Embodiment 2

[0067] The design method of permeable concrete mix ratio based on cement mortar density and coating performance, the specific process is as follows:

[0068] 1) with embodiment 1.

[0069] 2) Prepare cement paste, cement dosage m C =752g, the amount of silica fume m SF =48g, the amount of latex powder m L = 8g, the amount of early strength agent m E =8g, water consumption is m W = 256 g. Determine the density of the glue as ρ B =2.0907g / cm 3 . Calculation of the design glue dosage M B and design pulp set ratio R B / A :

[0070] m B =V B ·ρ B =0.2814m 3 ×2.0907g / cm 3 =588.3kg

[0071]

[0072] 3) Weigh the mass as m 1 Aggregate two parts, m 1 (unvibrated) = 30.0g, m 1 (Vibration)=30.4g, add 60g of freshly mixed cement mortar respectively, and mix the two evenly. Immediately put the mixture into a 2.36mm square hole sieve, and allow the mortar to flow freely (not vibrated) or flow out under vibration for 10s (tightened) from the square hole sieve within 30s...

Embodiment 3

[0084] The design method of permeable concrete mix ratio based on cement mortar density and coating performance, the specific process is as follows:

[0085] 1) with embodiment 1.

[0086] 2) Prepare cement paste, cement dosage m C =752g, the amount of silica fume m SF =48g, the amount of latex powder m L = 8g, the amount of early strength agent m E =8g, the dosage of water reducing agent is 0.64g, and the water consumption is m W = 256 g. Determine the density of the glue as ρ B =2.0234g / cm 3 . Calculation of the design glue dosage M B and design pulp set ratio R B / A :

[0087] m B =V B ·ρ B =0.2814m 3 ×2.0234g / cm 3 =569.4kg

[0088]

[0089] 3) Weigh the mass as m 1 Aggregate two parts, m 1 (unvibrated) = 30.1g, m 1 (Vibration)=30.2g, add 60g of freshly mixed cement mortar respectively, and mix the two evenly. Immediately put the mixture into a 2.36mm square hole sieve, and allow the mortar to flow freely (not vibrated) or flow out under vibration for ...

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Abstract

The invention relates to a pervious concrete proportion design method based on cement mortar density and wrapping performance, which comprises the following steps: based on a volume method and designed porosity, obtaining aggregate consumption and designed mortar volume; obtaining the use amount of designed mortar according to the actually measured density of the cement mortar, and further calculating a designed mortar-aggregate ratio; testing the coating performance of the cement mortar on the aggregate to obtain the maximum mortar-aggregate ratio; by comparing the designed mortar-aggregate ratio with the maximum mortar-aggregate ratio, determining the actual use amount of mortar of the pervious concrete, so that segregation, non-uniform coating and pore discreteness in the pervious concrete design process are controlled; and finally, based on composition of the actual use amount of mortar and the cement mortar, acquiring the pervious concrete mix proportion parameter. Compared with the prior art, the invention is easy and convenient to operate and high in practicability, the wrapping performance problem of the pervious concrete cement mortar can be well solved, and the pervious concrete meeting the design communication porosity and certain strength characteristics can be designed.

Description

technical field [0001] The invention belongs to the technical field of permeable cement concrete design, and relates to a permeable concrete proportioning design method based on cement mortar density and coating performance. Background technique [0002] In the process of modern urbanization, there are widespread problems such as blocked water circulation, water pollution, heat island effect, and noise pollution. The proposal of the "sponge city" construction plan, especially the promotion and application of permeable pavement, provides a good solution to the above problems. Permeable cement concrete is a porous concrete with a porosity of 10% to 30% and a certain water permeability, which is composed of aggregates, cement, water, admixtures and modifiers. Based on the rich void structure of pervious concrete, its environmental functions such as water permeability, water purification, cooling, and noise reduction can be realized. [0003] The mix ratio design of permeable c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/08
CPCG06Q10/0639G06Q50/08
Inventor 李辉杨洁张毅李准杨炳
Owner TONGJI UNIV
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