Before soaking in water, weigh the mass of the test piece again.
325# ordinary portland cement shall be used.
(there is no explicit requirement for strength in this design, and the specification of ＾ 3-4mpa) 1.2.2.6 ＾ the representative value of the compressive strength of the indoor test results of each mix proportion specimen is calculated as follows: R ＾ generation = R (l-zacv), where: R ＾ generation – the representative value of the compressive strength of this group of specimens, MPA: CV ― deviation coefficient of inch test results ［ in decimal ］ ZA ― assurance rate coefficient, expressway assurance rate ］ 95%, at this time ］ Za = 1.645: R ― average value of compressive strength of this group of specimens, mpao1 2.2.7} take the mix proportion meeting the strength requirements as the recommended production mix proportion and report it to the director’s representative for approval.
1.2.2.
(2) The crushing value shall not be greater than 30%, and stones with exceeding crushing value shall not be used.
1.2) mixture composition design: the composition design of mixture includes: passing the test according to the mixture strength standard required by the design Determine the necessary cement dosage and the optimum water content and maximum dry density of the mixture.
1.3 the machinery shall be equipped with complete construction machines, tools and accessories, and shall be well maintained and tested before commencement.
2.3 mixing, transportation and paving of mixture.
If the designed cement dosage is 6%, the mixture can be mixed according to the dosage of 4%, 6% and 8%.
During the curing period, the mass loss of the test piece shall not exceed LG.
grading requirements: the maximum particle size is 30mm, The particle composition shall meet the following requirements: square hole size (m) ＞ 302010520.50.075 passing mass 10090-10060-8030-5015-3010-200-7 percentage (% > 1.1.2.2) the crushing value of crushed stone shall not be greater than 30%.
Construction process 2.1.
Operation instruction for construction of cement stabilized macadam base 1 Preparatory work 1 L.
1.2.2.4 the standard curing conditions of cement stabilized macadam specimens are as follows: after demoulding and weighing the prepared specimens, they shall be immediately placed in the curing room with relative humidity of 95% for curing, and the curing temperature is 20 ± 2 ℃.
The gradation of the mixed mixture shall meet the requirements of 1.1.2 L) grading requirements of clause.
1.2.2 design of mixture composition.
The immersion water temperature shall be the same as the curing temperature.
2.
1.2.1 raw material test 1.2.1.1 cement (1) mortar degree test (2) initial and final setting time test 1.2.1 L.
L) prepare cement stabilized macadam mixture according to different cement dosage by mixing macadam mixture meeting the standard.
Before construction, the mixing equipment shall be installed and debugged, the flow of various materials within a certain period of time shall be weighed, and the flow control settings shall be adjusted to ensure that the flow of various materials is uniform at any time, so as to ensure that the mixture gradation meets the determined construction mix proportion.
2.2.2 the total station shall set out the area to be paved, carry out elevation survey, and set elevation control piles at the outer shoulder.
(the specific mix proportion design shall be based on the drawing requirements) 1.2.2.2 ， determine the best water content and maximum dry bulk density of various mixtures.
Preparation of lower bearing layer.
1.2.2.5 the representative value of 7-day immersion compressive strength of lime fly ash macadam specimen shall meet the requirements.
1.4 main instruments for testing the quality of cement stabilized macadam: (1) heavy compactor (2) equipment for preparing and measuring the compressive strength of cement stabilized macadam compressive test pieces (3) standard curing room (4) compactness testing equipment (5) standard sieve (square hole) > (6) crushing value testing equipment (7) measuring instruments: total station and level 1.5) installation and adjustment of mixing equipment, Measurement of various materials.
Generally, there shall be no accidents hindering the construction progress and quality during the construction period.
On the last day (the 7th day) of the curing period, immerse the test piece in water with the depth of water so that the water surface is about 2.5cm above the top of the test piece.
2.3.
1.2.2.3 under the optimum water content condition, prepare the mixture test piece according to the compactness ＜ 98% required by the specification, cure it under standard conditions for 6 days, and measure the unconfined compressive strength after immersion curing for 1 day.
1.1.2 crushed stone L.
1.1.1.2 the final setting time should be more than others, and fast hardening cement and early strength cement should not be used.
1.1.2.3) all kinds of stones used in the project shall be stacked separately and shall not be piled together.
I.3) water: the water source for human or livestock drinking can be used, and in case of suspicious water source, relevant departments shall be entrusted to test and identify.
Number of test pieces per group: 9 when the deviation coefficient is 10% – 15%; 13 when the deviation coefficient is 15% – 20%.
2.2.1 the surface of the lower bearing layer passing the acceptance shall be flat and solid without any loose materials and weak places.
material 1.1.1 cement 1.1.1.1.
The main machines equipped are: (1) forced granular mixer with an output of 120-150t / H2; (2) paver; (3) vibratory roller; (2) tire roller; (2), (5) 18-20t three wheel roller; (4), (6) 15 dump trucks above lot; (7) loader; (2); (8) (2) sprinklers.
The test piece with mass loss exceeding this provision shall be discarded.
crushed stone (1) various stones used in the project shall be screened respectively, and the mixing proportion shall be calculated according to the particle composition.
Process flow: preparation of lower bearing layer → mixing, transportation and paving → rolling → working joint treatment → inspection → curing 2.2.
1.
L) mixing must be uniform and consistent in color..
