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Method for fast predicting compressive strength of cement in 24 hours

A compressive strength, 24-hour technology, applied in the fields of civil engineering, construction industry, and hydraulic engineering, can solve problems such as low correlation, long cycle, and changing experimental conditions, and achieve the effect of simple calculation

Inactive Publication Date: 2014-03-26
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology improves upon previous methods by reducing testing cycles for faster determining when concrete needs maintenance or replacing materials quickly without having significant amounts of time needed before it can be used again. It also allows for more accurate predictions based on past performance rather than current ones.

Problems solved by technology

Technologies described in these technical problem addressed include various techniques such as conventional testing or advanced compression technology, but none provide accurate predictions over multiple variables during the evaluation of concrete properties like tensile stress resistance and compressibility.

Method used

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  • Method for fast predicting compressive strength of cement in 24 hours
  • Method for fast predicting compressive strength of cement in 24 hours
  • Method for fast predicting compressive strength of cement in 24 hours

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: A certain brand of Portland cement P.II42.5R

[0058] Look up Table 1 to determine that the cement C value is 1.3.

[0059] When placed in the humid heat curing box, the temperature is 20.7°C, and the calculated weight maturity and strength results are as follows:

[0060] Age 4h:

[0061] Age 5.5h: 1.5h is from 20.7°C to 55°C, this part is calculated according to the average temperature

[0062]

[0063] Age 9h: and 55 ℃ constant temperature time is 9h-0.5h-5.5h=3h

[0064]

[0065] The calculation is the same as the 9h age, except that the 55°C constant temperature time for other ages is different. The calculation results are as follows:

[0066] m w24h =1872.9℃.h

[0067] The 28-day weight maturity under 20°C standard maintenance is calculated as follows:

[0068]

[0069] The predicted value can be obtained by substituting the compressive strength of cement mortar sand for 9h and 24h under humid heat curing into formula (2):

[0070] ...

Embodiment 2

[0074] Example 2: A certain brand of fly ash Portland cement P.F32.5

[0075] Look up Table 1 to determine that the cement C value is 1.3.

[0076] When placed in the humid heat curing box, the temperature is 21°C, and the calculated weight maturity results are as follows:

[0077] m 9h =479.7℃.h

[0078] m w24h =1873.4℃.h

[0079] m w28d =17012℃.h

[0080] The predicted value can be obtained by substituting the compressive strength of cement mortar sand for 9h and 24h under humid heat curing into formula (2):

[0081] f 28 d = 19.8 - 7.8 lg 1873.4 - lg 479.7 × ( lg 17012 - lg 479.7 ) + 7.8 = 40....

Embodiment 3

[0085] Example 3: A certain brand of slag portland cement P.S.A32.5

[0086] Look up Table 1 and determine that the C value of the cement is 1.4.

[0087] When placed in the humid heat curing box, the temperature is 20°C, and the calculated weight maturity results are as follows:

[0088] m 9h =523.5℃.h

[0089] m w24h =2137℃.h

[0090] m w28d =16364.7℃.h

[0091] The predicted value can be obtained by substituting the compressive strength of cement mortar sand for 9h and 24h under humid heat curing into formula (2):

[0092] f 28 d = 18.2 - 7.2 lg 2137 - lg 523.5 × ( lg 16364.7 - lg 523.5 ) + 7.2 = ...

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Abstract

The invention provides a method for fast predicting compressive strength of cement in 24 hours. Existing JC/T738-2004 fast cement test equipment is adopted, a group of mortar test blocks are formed, the compressive strength at two ages in 24 hours of hot and humid maintenance at 55 DEG C is tested, weight maturity is calculated according to cement type values and substituted into a relation to predict the compressive strength of the cement in 28 days. Research shows that the fast prediction method is feasible and effective, and the 28-day strength prediction accuracy is high.

Description

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Claims

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Application Information

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Owner SHENZHEN UNIV
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