A weight cementitious material for use in a weight concrete

Abstract

The application relates to the technical field of concrete, in particular to a weighting cementitious material applied to weighting concrete. The weighting cementitious material applied to the weighting concrete comprises cement, and further comprises one or both of calcium 2,5-dihydroxybenzenesulfonate and polydithiobispropane sulfonate sodium. The calcium 2,5-dihydroxybenzenesulfonate is soluble in water, uniformly dispersed in slurry, can reduce the sedimentation of heavy aggregate, make the cement and the heavy aggregate more uniformly dispersed, improve the cracking phenomenon of the concrete, improve the compressive strength of the weighting concrete, and improve the reliability and durability of the weighting concrete. The polydithiobispropane sulfonate sodium can improve the consistency of the concrete slurry, reduce the sedimentation of the heavy aggregate, improve the dispersion uniformity of the cement and the heavy aggregate, also can improve the slump of the concrete, and improve the early compressive strength of the concrete, and is convenient for construction.

Description

Technical Field

[0001] This application relates to the field of concrete technology, and in particular to a counterweight cementitious material used in counterweight concrete. Background Technology

[0002] Counterweight concrete can be used for balancing settlement in main and podium buildings, ballast in bridges, and wear-resistant flooring in industrial plants.

[0003] Ordinary concrete is generally made by mixing coarse aggregate, fine aggregate, cement, and water in a certain proportion. Fine aggregate particles have a diameter between 0.16 and 5 mm, and are typically made from natural sand such as river sand, sea sand, and valley sand, or artificial sand ground from hard rocks. Coarse aggregate particles have a diameter greater than 5 mm, and commonly used materials include crushed stone and pebbles. Lightweight aggregate concrete commonly uses natural porous rocks such as pumice, and artificial porous aggregates such as expanded clay and expanded slag. Weighted concrete generally uses heavy aggregates with a density greater than that of sand and gravel, such as steel slag, steel shot, iron shot, iron filings, and barite, to replace some or completely replace sand and gravel. Using ordinary cement to bind these heavy aggregates can lead to segregation after slurry preparation. This is because these heavy aggregates have a high density and the bonding force between them and cement is weaker than that between sand and cement. This increases the difficulty of construction, and also results in low compressive strength of the cured concrete, making it prone to cracking and reducing its reliability and durability. Summary of the Invention

[0004] Given that using ordinary cement to bind heavy aggregates can easily lead to segregation after slurry preparation, increasing construction difficulty, and also resulting in low compressive strength of the cured concrete, easy cracking, and reduced reliability and durability, this application proposes a counterweight cementitious material for use in counterweight concrete to improve this situation.

[0005] In the first aspect, this application proposes a counterweight cementitious material for use in counterweight concrete, and adopts the following technical solution.

[0006] A counterweight cementitious material for use in counterweight concrete, comprising cement, and one or both of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate.

[0007] By employing the above technical solution, the counterweight cementitious material is applied to the counterweight concrete. After slurry preparation, the cement gradually hydrates and binds to the heavy aggregates in the concrete. Sodium polydisulfide dipropane sulfonate is easily soluble in water and forms a network structure in the slurry, increasing the consistency of the concrete slurry, resisting the settling effect of the heavy aggregates in the counterweight concrete, increasing the slump of the concrete slurry, and also improving the early compressive strength of the concrete, meeting some application requirements, such as winter construction and emergency repair projects. Calcium 2,5-dihydroxybenzenesulfonate is soluble in water and can be evenly dispersed in the slurry. It has many hydrophilic groups. Cement molecules hydrate around calcium 2,5-dihydroxybenzenesulfonate, which improves the dispersibility of hydrated cement molecules, providing good support and confinement for cement molecules, making the concrete denser, improving the cracking phenomenon caused by concrete expansion and contraction, and thus also improving the compressive strength of the counterweight concrete. Dense concrete can prevent water and carbon dioxide from penetrating into it, reducing carbonation and improving the durability of weighted concrete. Adding calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate to concrete simultaneously improves slump and compressive strength, while also reducing water consumption and shrinkage, making the concrete less prone to cracking and enhancing its impermeability and frost resistance.

[0008] Preferably, the counterweight cementitious material is cement and calcium 2,5-dihydroxybenzenesulfonate, and the mass ratio of the cement to the calcium 2,5-dihydroxybenzenesulfonate is 100:(9-15).

[0009] By employing the above technical solution, calcium 2,5-dihydroxybenzenesulfonate is uniformly dispersed in the cement during slurry preparation, refining the crystalline phase and enhancing its supporting effect on the cement. Insufficient calcium 2,5-dihydroxybenzenesulfonate will result in an insignificant improvement in its supporting effect on the cement.

[0010] Preferably, the counterweight cementitious material is cement and sodium polydisulfide dipropane sulfonate, and the mass ratio of the cement to the sodium polydisulfide dipropane sulfonate is 100:(6-10).

[0011] By employing the above technical solution, sodium polydisulfide dipropane sulfonate is uniformly dispersed in the cement during the preparation of the slurry, enhancing its supporting effect on heavy aggregates. Insufficient sodium polydisulfide dipropane sulfonate has little effect on improving the uniformity of cement and heavy aggregate dispersion, increasing concrete slump, and enhancing early compressive strength.

[0012] Preferably, the counterweight cementitious material is cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate; the mass ratio of the cement, the calcium 2,5-dihydroxybenzenesulfonate, and the sodium polydisulfide dipropanesulfonate is 100:(8-12):(3-6).

[0013] By adopting the above technical solution, cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate are used in combination to prepare counterweight concrete, which can simultaneously improve the compressive strength, crack resistance, slump, and corrosion resistance of the counterweight concrete.

[0014] More preferably, the mass ratio of the cement, the calcium 2,5-dihydroxybenzenesulfonate, and the sodium polydisulfide dipropanesulfonate is 100:(9-11):(4-5).

[0015] By adopting the above technical solutions, in addition to improving multiple properties of concrete, calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate fill the pores of concrete, further making the concrete interior dense, less prone to water seepage and cracking, and further improving the concrete's impermeability.

[0016] Preferably, the counterweight cementitious material is obtained by mixing cement, and one or two of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate, mixing them evenly, and then drying and sealing them.

[0017] By adopting the above technical solution, the mixed gel material is easy to use and can be directly used for concrete slurry preparation.

[0018] Preferably, the cement has a particle size of 0-50 μm, the calcium 2,5-dihydroxybenzenesulfonate has a particle size of 0-10 μm, and the sodium polydisulfide dipropanesulfonate has a particle size of 0-10 μm.

[0019] By adopting the above technical solution, cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate are more evenly dispersed. When used to adjust concrete slurry, they can dissolve more quickly in the slurry, rapidly increase the consistency of the concrete slurry, reduce the settling effect of heavy aggregates in the weighted concrete, improve the convenience of construction, and make the concrete more compact after solidification. This significantly improves the crack resistance, impermeability, and frost resistance of the concrete.

[0020] Secondly, this application also proposes the application of counterweight cementitious materials in counterweight concrete and adopts the following technical solution.

[0021] An application of a counterweight cementitious material as described above, wherein the counterweight cementitious material is used to bind heavy aggregates in counterweight concrete.

[0022] By adopting the above technical solution, the aggregate is evenly dispersed in the slurry during pulp preparation, the settling speed is slow, it is easy to maintain the uniformity of the slurry, and the construction difficulty is reduced.

[0023] Preferably, the heavy aggregate is selected from one or more of steel grit and iron filings.

[0024] By adopting the above technical solution, steel grit and iron filings can be well dispersed in the settling concrete prepared using the above-mentioned counterweight cementitious material.

[0025] Thirdly, this application also proposes the application of a combination of cement, calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate as the counterweight cementitious material in counterweight concrete, and adopts the following technical solution.

[0026] An application of a counterweight cementitious material, wherein the counterweight cementitious material is used to bind heavy aggregates in counterweight concrete; in the counterweight concrete, the mass ratio of counterweight cementitious material:heavy aggregates:water is (105-120):(800-1000):(33-37). Wherein, the mass ratio of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate is 100:(8-12):(3-6).

[0027] By adopting the above technical solution, under this ratio, when preparing the slurry, the heavy aggregate is evenly dispersed in the slurry, the sedimentation is slow, the workability is good, the construction is easy, and the concrete after solidification has good mechanical properties and weather resistance.

[0028] In summary, the counterweight cementitious material applied in counterweight concrete of this application has the following beneficial effects: Applying counterweight cementitious materials to counterweight concrete reduces the settling effect of heavy aggregates, resulting in more uniform dispersion of cement and heavy aggregates. It also provides support and restraint, thereby improving concrete cracking, reducing carbonation, increasing compressive strength, reliability, and durability. Sodium polydisulfide dipropane sulfonate increases the consistency of concrete slurry, reduces the settling effect of heavy aggregates, improves the uniformity of cement and heavy aggregate dispersion, increases slump, and enhances early compressive strength, facilitating construction. Simultaneous addition of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate to concrete increases slump and compressive strength, reduces water consumption, makes the concrete less prone to shrinkage or expansion cracking, and improves its impermeability. Detailed Implementation

[0029] The following examples, comparative examples, and test cases provide a more detailed description of the counterweight cementitious material applied in counterweight concrete according to this application.

[0030] The sources of some materials used in Examples 1-13 and Comparative Examples 1-9 are as follows: The cement was ordinary silicate cement from the same batch, supplied by Sanhe Yanhong Trading Co., Ltd. The cement particle size was 0–50 μm; calcium 2,5-dihydroxybenzenesulfonate was a white powder, supplied by Hubei Xinghengye Technology Co., Ltd. The particle size of calcium 2,5-dihydroxybenzenesulfonate was 0–10 μm; sodium polydisulfide dipropane sulfonate was a white to pale yellow powder, supplied by Nantong Runfeng Petrochemical Co., Ltd. The particle size of sodium polydisulfide dipropane sulfonate was 0–10 μm.

[0031] Comparative Example 10 adjusted the particle size of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. The particle size of cement was 100–300 μm, that of calcium 2,5-dihydroxybenzenesulfonate was 20–50 μm, and that of sodium polydisulfide dipropane sulfonate was 20–50 μm.

[0032] Examples 1-3 According to the formula in Table 1, cement and calcium 2,5-dihydroxybenzenesulfonate are mixed to prepare a counterweight cementitious material.

[0033] Table 1. Proportions of each component in the preparation of the counterweight cementitious material Examples 4-6 According to the formula in Table 2, cement and sodium polydisulfide dipropane sulfonate are mixed to prepare a counterweight cementitious material.

[0034] Table 2. Proportions of each component in the preparation of the counterweight cementitious material Examples 7-13 According to the formula in Table 3, cement, calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate are mixed to prepare a counterweight cementitious material.

[0035] Table 3. Proportions of each component in the preparation of the counterweight cementitious material Comparative Examples 1-9 Prepare the counterweight cementitious material according to the formula in Table 4.

[0036] Table 4. Proportions of each component in the preparation of the counterweight cementitious material In Comparative Example 10, the cement used was ordinary Portland cement with a particle size of 100–300 μm, the calcium 2,5-dihydroxybenzenesulfonate had a particle size of 20–50 μm, and the sodium polydisulfide dipropane sulfonate had a particle size of 20–50 μm.

[0037] Application Example 1 All the counterweight cementitious materials prepared in Examples 1-13 and Comparative Examples 1-10 were taken out, and 560 parts of coarse steel sand with a particle size of 10-25 mm and 380 parts of fine steel sand with a particle size of 0.5-3 mm from the same source were added respectively. In order to obtain workable concrete slurry, according to the real-time stirring state, 45 parts of water were added to Examples 1-6, 35 parts of water were added to Examples 7-13, 55 parts of water were added to Comparative Example 1, and 45 parts of water were added to Comparative Examples 2-9. The mixtures were stirred thoroughly to obtain 23 kinds of concrete slurry. Various tests were performed on the 23 kinds of slurry and the cured samples made from the slurry. The test items and the reference standards are as follows: (1) Slump: The test method refers to GB / T 50080-2016 Standard for Test Methods of Performance of Ordinary Concrete Mixtures.

[0038] (2) Compressive strength: The test method refers to "GB / T 50081-2019 Standard for Test Methods of Physical and Mechanical Properties of Concrete".

[0039] (3) Crack resistance: The test method refers to Section 9, Early Crack Resistance Test, of GB / T 50082-2009 Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete.

[0040] (4) Permeability grade: The permeability grade of concrete is tested according to the step-by-step pressure method in GB / T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete".

[0041] (5) Chloride ion migration coefficient: according to the rapid chloride ion migration coefficient method in 7.1 of GB / T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete".

[0042] (6) Freeze-thaw resistance: The freeze-thaw resistance test was carried out in accordance with Section 4 of GB / T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete". After curing the sample for 28 days, it was frozen at -18℃ for 4 hours and then thawed at 18℃ for 4 hours, which constituted one freeze-thaw cycle. The cycle was repeated 25 times. The compressive strength before and after the test was recorded, and the mass loss rate and compressive strength loss rate were calculated. Mass loss rate = (initial mass - mass after test) / initial mass * 100%, compressive strength loss rate = (initial compressive strength - compressive strength after test) / initial compressive strength * 100%.

[0043] The test results for the above test items are shown in Tables 5 and 6.

[0044] Table 5. Test data of slurry performance Table 6. Test results of concrete specimen performance As can be seen from the results in Tables 5 and 6, the slump, compressive strength, crack resistance, water permeability resistance, and chloride ion penetration resistance of the samples in Examples 1-13 are generally stronger than those in Comparative Examples 1-10. The samples in Examples 1-13 have high density and good impermeability, thus reducing carbonation caused by carbon dioxide penetration into concrete and improving the reliability and durability of the counterweight concrete.

[0045] The counterweight cementitious material in Examples 1-3 was cement and calcium 2,5-dihydroxybenzenesulfonate. The counterweight cementitious material in Examples 4-6 was cement and sodium polydisulfide dipropane sulfonate. Examples 7-13 consisted of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. The counterweight cementitious material in Comparative Example 1 contained only cement. The comparison shows that calcium 2,5-dihydroxybenzenesulfonate significantly improved the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and frost resistance of concrete. Sodium polydisulfide dipropane sulfonate also improved the slump and compressive strength of concrete. In terms of strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and freeze-thaw resistance, calcium 2,5-dihydroxybenzenesulfonate is more effective in improving the 28-day compressive strength, crack resistance, and chloride ion permeability resistance of concrete, while sodium polydisulfide dipropane sulfonate is more effective in improving the slump and 7-day compressive strength of concrete. The combined use of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate can simultaneously improve the slump, 7-day compressive strength, 28-day compressive strength, crack resistance, and chloride ion permeability resistance of concrete, and further enhance the water permeability resistance and freeze-thaw resistance of concrete.

[0046] The weighting cementitious material in Comparative Example 2 was cement and calcium 2,5-dihydroxybenzenesulfonate, but the proportion of calcium 2,5-dihydroxybenzenesulfonate was relatively small. Compared with Comparative Example 1 and Examples 1-3, it can be seen that adding a smaller proportion of calcium 2,5-dihydroxybenzenesulfonate helps to improve the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance and frost resistance of concrete, but the improvement is small.

[0047] The counterweight cementitious material in Comparative Example 3 was cement and calcium 2,5-dihydroxybenzenesulfonate. However, the proportion of calcium 2,5-dihydroxybenzenesulfonate was too high. Compared with Examples 1-3, it can be seen that adding too high a proportion of calcium 2,5-dihydroxybenzenesulfonate resulted in a decrease in the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and frost resistance of the concrete. However, it was still better than the series of properties of Comparative Example 1.

[0048] The weighting cementitious material in Comparative Example 4 consisted of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. However, the proportion of calcium 2,5-dihydroxybenzenesulfonate was too high. Compared with Comparative Example 3, it can be seen that adding a small amount of sodium polydisulfide dipropane sulfonate on the basis of adding excessive calcium 2,5-dihydroxybenzenesulfonate can slightly improve the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and freeze-thaw resistance of concrete.

[0049] The weighting cementitious material in Comparative Example 5 was cement and sodium polydisulfide dipropane sulfonate, but the proportion of sodium polydisulfide dipropane sulfonate added was relatively small. Compared with Comparative Example 1 and Examples 4-6, it can be seen that adding a small proportion of sodium polydisulfide dipropane sulfonate helps to improve the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance and freeze-thaw resistance of concrete, but the improvement is small.

[0050] The counterweight cementitious material in Comparative Example 6 was cement and sodium polydisulfide dipropane sulfonate. However, the proportion of sodium polydisulfide dipropane sulfonate added was relatively large. Compared with Examples 4-6, it can be seen that adding too large a proportion of sodium polydisulfide dipropane sulfonate resulted in a decrease in the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and freeze-thaw resistance of the concrete. However, it was still better than the series of properties in Comparative Example 1.

[0051] The counterweight cementitious material in Comparative Example 7 consisted of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. However, the proportion of sodium polydisulfide dipropane sulfonate was too high. Compared with Comparative Example 6, it can be seen that adding a small amount of calcium 2,5-dihydroxybenzenesulfonate on the basis of adding excessive sodium polydisulfide dipropane sulfonate can slightly improve the slump, compressive strength, water permeability, chloride ion permeability, and frost resistance of concrete.

[0052] The weighting cementitious material in Comparative Example 8 was cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. However, the addition ratios of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate were relatively small. Compared with Comparative Example 1 and Examples 7-13, it can be seen that adding a smaller proportion of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate helps to improve the slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and frost resistance of concrete, but the improvement is small.

[0053] The weighting cementitious material in Comparative Example 9 consisted of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. However, the proportions of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate were too high. Compared with Comparative Example 1, it can be seen that although the proportions of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate were too high, they still significantly improved the slump, compressive strength, crack resistance, water permeability, chloride ion permeability, and frost resistance of the concrete. However, the slump decreased too quickly, and the other effects were not as good as those in Examples 7-13, which used appropriate proportions of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropane sulfonate.

[0054] The weighting cementitious material in Comparative Example 10 consisted of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate, in the same proportions as in Example 9. In Example 9, the cement particles had a diameter of 0–50 μm, the calcium 2,5-dihydroxybenzenesulfonate particles had a diameter of 0–10 μm, and the sodium polydisulfide dipropane sulfonate particles had a diameter of 0–10 μm. In Comparative Example 10, the cement particles had a diameter of 100–300 μm, the calcium 2,5-dihydroxybenzenesulfonate particles had a diameter of 20–50 μm, and the sodium polydisulfide dipropane sulfonate particles had a diameter of 20–50 μm. Smaller particles can fill more pores, resulting in higher dispersion, faster dissolution, and improved concrete density. Comparative Example 10 used larger particles. Compared with Example 9, its slump was not significantly different, but its compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance and frost resistance were all reduced, indicating that the larger particles of powder reduced the density of the concrete.

[0055] The comparisons between Comparative Example 4 and Comparative Examples 3 and 5, as well as between Comparative Example 7 and Comparative Examples 2 and 6, and between Comparative Example 8 and Comparative Examples 2 and 5, and between Comparative Example 9 and Comparative Examples 3 and 6, show that the simultaneous addition of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate significantly improves the water permeability, chloride ion permeability, and frost resistance of concrete.

[0056] The weighting binders in Comparative Examples 4 and 7-9 were cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate. However, compared to Examples 7-13, the proportions of these three substances were adjusted, resulting in a difference in the improvement of concrete slump, compressive strength, crack resistance, water permeability resistance, chloride ion permeability resistance, and frost resistance. This indicates that selecting an appropriate ratio of cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropane sulfonate has a significant impact on improving these properties. Furthermore, in Examples 7-13, the concrete prepared according to the materials in Examples 9-11 exhibited even better performance in terms of slump, compressive strength, crack resistance, chloride ion permeability resistance, and frost resistance.

[0057] In Examples 1-6, 45 parts water were used each; in Examples 7-13, 35 parts water were used each; in Comparative Example 1, 55 parts water were used; and in Comparative Examples 2-8, 45 parts water were used. It can be seen that Examples 7-13, using appropriately proportioned cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate, exhibit a significant water-reducing effect, lowering water consumption and reducing cracking caused by shrinkage during drying, while also improving the concrete's impermeability. Comparative Example 1 used the most water and had the worst crack resistance and impermeability.

[0058] The counterweight cementitious material configured in this embodiment, when applied to counterweight concrete, after slurry preparation, increases the consistency of the concrete slurry, reduces the settling effect of heavy aggregates, improves the dispersion uniformity of cement and heavy aggregates, increases the slump of the concrete, and enhances the early compressive strength of the concrete, facilitating construction. Calcium 2,5-dihydroxybenzenesulfonate further disperses cement and heavy aggregates more evenly, and also provides support and restraint, reducing the expansion after cement hydration and the degree of shrinkage during subsequent setting, thereby improving concrete cracking, increasing the compressive strength of the counterweight concrete, making the concrete denser, reducing carbonation, and improving the reliability and durability of the counterweight concrete.

Claims

1. A counterweight cementitious material used in counterweight concrete, characterized in that, This includes cement, and also includes one or both of calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate. If the counterweight cementitious material is cement and calcium 2,5-dihydroxybenzenesulfonate, then the mass ratio of the cement to the calcium 2,5-dihydroxybenzenesulfonate is 100:(9~15). If the counterweight cementitious material is cement and sodium polydisulfide dipropane sulfonate, then the mass ratio of the cement to the sodium polydisulfide dipropane sulfonate is 100:(6~10). If the counterweight cementitious material is cement, calcium 2,5-dihydroxybenzenesulfonate and sodium polydisulfide dipropanesulfonate, then the mass ratio of the cement, the calcium 2,5-dihydroxybenzenesulfonate and the sodium polydisulfide dipropanesulfonate is 100:(8~12):(3~6).

2. The counterweight cementitious material applied in counterweight concrete according to claim 1, characterized in that, The mass ratio of the cement, the calcium 2,5-dihydroxybenzenesulfonate, and the sodium polydisulfide dipropanesulfonate is 100:(9~11):(4~5).

3. The counterweight cementitious material applied to counterweight concrete according to claim 1 or 2, characterized in that, The counterweight cementitious material is obtained by mixing cement, calcium 2,5-dihydroxybenzenesulfonate, and sodium polydisulfide dipropanesulfonate, mixing them evenly, and then drying and sealing them.

4. The counterweight cementitious material applied in counterweight concrete according to claim 1, characterized in that, The cement has a particle size of 0~50μm, the calcium 2,5-dihydroxybenzenesulfonate has a particle size of 0~10μm, and the sodium polydisulfide dipropanesulfonate has a particle size of 0~10μm.

5. An application of the counterweight cementitious material as described in any one of claims 1-4, characterized in that, The counterweight cementitious material is used to bind the heavy aggregate in the counterweight concrete.

6. The application of the counterweight cementitious material according to claim 5, characterized in that, The heavy aggregate is selected from one or both of steel grit and iron filings.

7. An application of the counterweight cementitious material as described in claim 1 or 2, characterized in that, The counterweight cementitious material is used to bind the heavy aggregate in the counterweight concrete; in the counterweight concrete, the mass ratio of counterweight cementitious material: heavy aggregate: water is (105~120):(800~1000):(33~37).

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