Cement stabilized macadam: Cement stabilized macadam material is mainly composed of granular materials and mortar volume. The granular material is graded macadam, and the mortar volume includes water and cementitious materials, and consists of cement and mixed materials.

Lime fly ash stone: It consists of hydrated lime, fly ash and crushed stone.

2. The acceptance requirements are different.

Cement stabilized macadam:

There is no quality acceptance standard for cement stabilized macadam base of urban roads. The municipal administrative department and the municipal quality inspection station have agreed on the quality inspection standards for urban main roads as follows:

Compaction: 98% of the optimal compaction.

Smoothness: 3m straightedge shall not exceed 10mm every 40m section.

Elevation of longitudinal section: 5,-10, one section every 20m.

Width: the design value shall not be less than one section every 20m.

Thickness: 0,-10

Transverse slope: 0.3

Strength: 0~0

The surface of cement stabilized macadam is smooth and dense, without potholes, and the construction is smooth.

Limestone:

On-site acceptance is based on the design "deflection value" of lime-fly ash macadam layer, and it is tested by special testing instruments, which meets the design requirements. Appearance requirements: correct slope, smooth surface and accurate elevation.

3. Pay attention to different structures.

Cement stabilized macadam:

Problems in construction:

First check the subbase and recheck the elevation of control piles. Before laying cement stabilized macadam, the subbase should be cleaned and sprayed with proper amount of water to keep it moist.

Mixing adopts factory centralized mixing. Before using the plant mixing equipment, the plant mixing equipment and various metering systems should be debugged to make the water content, aggregate gradation and cement content of the mixed mixture meet the matching requirements, so that the machine can operate normally and the output of the mixer is consistent with the paving production capacity used.

When paving and rolling, the paving coefficient is between 3 and 5. The principle of "rather high than low, rather scraping than mending" must be implemented in the construction, and all construction projects should be completed before the final setting of cement. After rolling, the compactness test shall be conducted immediately. If the test result is not up to standard, roll again.

In general, cement stabilized macadam can not be constructed until 24 hours after the operation is completed. The interval between it and the kerb should not be too long, otherwise the slab will be hard after the mixture is formed, which will increase the construction difficulty and the integrity of the slab will be easily destroyed by knocking and chiseling.

The curing time shall not be less than 7 days. During this period, vehicles are prohibited from passing, and they are maintained with sprinklers 2~4 times a day to keep them moist.

Limestone:

Attention should be paid to during construction:

Lime-fly ash macadam is stirred by mixer, spread by paver, and compacted in layers by vibratory roller. Technicians should control the elevation during construction.

References:

Baidu encyclopedia-cement stabilized macadam

References:

Baidu encyclopedia-limestone